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© RAINER MAURER, Pforzheim -1- Prof. Dr. Rainer Maurer Macroeconomics 1. Introduction to Macroeconomics Lecture Notes: www.rainer-maurer.de E-Mail: [email protected] Colloquium: Friday 15.30 - 17.00 (room W4.1.03) © RAINER MAURER, Pforzheim -2- Prof. Dr. Rainer Maurer 1) The recommended literature typically includes more content than necessary for an understanding of this chapter. Relevant for the examination is the content of this chapter as presented in the lectures. 1. Introduction to Macroeconomics 1.1. What is Macroeconomics? 1.2. The Basic Model: The Circular-Flow Model 1.3. The Basic Data: GDP and its Components 1.3.1. What Is GDP? 1.3.2. Three Ways of Computing GDP 1.3.3. Nominal vs. real GDP and the GDP-Deflator 1.3.4. From GDP to Disposable Income of Households 1.3.5. GDP and Welfare 1.4. Questions for Review Literature: 1) Chapter 22, Mankiw, N.G.: Principles of Economics, Harcourt College. Chapter 2, Mankiw, N.G.: Macroeconomics, Worth Publishers. © RAINER MAURER, Pforzheim -3- Prof. Dr. Rainer Maurer 1. Introduction to Macroeconomics 1.1. What is Macroeconomics? 1.1. What is Macroeconomics? © RAINER MAURER, Pforzheim -4- Prof. Dr. Rainer Maurer Microeconomics studies the behavior of individual households and firms. Macroeconomics studies the economy as a whole – that is the sum of the individual behavior of households and firms. 1. Introduction to Macroeconomics 1.1. What is Macroeconomics? © RAINER MAURER, Pforzheim -5- Prof. Dr. Rainer Maurer As we will see: The macroeconomic “whole” is more than the sum of its microeconomic “parts”! Famous example: The „savings paradoxon“: For an individual household or company it is always possible to increase savings by reducing expenditure – since individual income stays constant if the household reduces expenditure: Savings = Income - Expenditure For the economy as a whole it is (in the short run version of the Keynesian theory…) not possible to increase savings by reducing expenditure – since total income falls if all households and companies reduce their expenditure: Savings = Income - Expenditure 1. Introduction to Macroeconomics 1.1. What is Macroeconomics? © RAINER MAURER, Pforzheim -6- Prof. Dr. Rainer Maurer Microeconomics deals with disaggregated data, while macroeconomics deals with aggregated data, like the sum of the value of all goods and services produced in an economy (GDP), the sum of the common change of all prices of goods and services (inflation), the share of all unemployed persons in the total labor force (unemployment rate) and so on… 1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

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Page 1: Macroeconomics 1. Introduction to Macroeconomics …rainer-maurer.com/mediapool/90/903602/data/Macroeconomics/AU_1... · Macroeconomics 1. Introduction to Macroeconomics Lecture Notes:

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Macroeconomics1. Introduction to Macroeconomics

Lecture Notes: www.rainer-maurer.deE-Mail: [email protected]

Colloquium: Friday 15.30 - 17.00 (room W4.1.03)

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1) The recommended literature typically includes more content than necessary for an understanding of this chapter. Relevant for the examination is the content of this chapter as presented in the lectures.

1. Introduction to Macroeconomics

1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model1.3. The Basic Data: GDP and its Components

1.3.1. What Is GDP?1.3.2. Three Ways of Computing GDP1.3.3. Nominal vs. real GDP and the GDP-Deflator

1.3.4. From GDP to Disposable Income of Households1.3.5. GDP and Welfare

1.4. Questions for Review

Literature:1)

Chapter 22, Mankiw, N.G.: Principles of Economics, Harcourt College. Chapter 2, Mankiw, N.G.: Macroeconomics, Worth Publishers.

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1. Introduction to Macroeconomics1.1. What is Macroeconomics?

1.1. What is Macroeconomics?

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➤Microeconomics studies the behavior of individualhouseholds and firms.

➤Macroeconomics studies the economy as a whole – that is the sum of the individual behavior of households and firms.

1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

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➤ As we will see: The macroeconomic “whole” is more thanthe sum of its microeconomic “parts”!

■ Famous example: The „savings paradoxon“: ◆For an individual household or company it is always

possible to increase savings by reducing expenditure –since individual income stays constant if the household reduces expenditure:

Savings = Income - Expenditure

◆For the economy as a whole it is (in the short run version of the Keynesian theory…) not possible to increase savings by reducing expenditure – since total income falls if all households and companies reduce their expenditure:

Savings = Income - Expenditure

1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

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➤Microeconomics deals with disaggregated data, while macroeconomics deals with aggregated data, like

■ the sum of the value of all goods and services producedin an economy (GDP),

■ the sum of the common change of all prices of goods and services (inflation),

■ the share of all unemployed persons in the total labor force (unemployment rate) and so on…

1. Introduction to Macroeconomics1.1. What is Macroeconomics?

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➤Macroeconomics deals with three domains:

1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

Macroeconomic Strategies

Macroeconomic Theories

Macroeconomic Aims

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➤Macroeconomics deals with three domains:

1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

Macroeconomic Theories:

Explication of macroeconomic observations:

Why is per capita income in some countries higher as in others?

Neoclassical growth theory (chapter 4)

Why are there business cycle fluctuations?Neoclassical & Keynesian macro model (chapters 2 & 3)

Why is there inflation?

Neoclassical and Keynesian macro model (chapter 2 )

Why is there unemployment?

A bunch of different theories (chapter 6)

Theories = Explications

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➤Macroeconomics deals with three domains:

1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

Macroeconomic Aims:

Choice of macroeconomic aims:

Shall the average income growth of a country equal -2%, 0%, 2% or 10%? (Chapter 4)

Shall business cycle fluctuations be prevented? (Chapter 2 & 3)

Shall the inflation target equal -2%, 0%, 2% … ? (Chapter 6)

Conflict of aims cannot be solved by „objective sci ence“! Political (normative) decisions are necessary!

→ see Digression!

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Digression: The Choice of Macroeconomic Aims (1): The choice of macroeconomic aims has to aspects:

1. What aims can be reached?2. What aims are desirable?

Ad 1: The first question is a technical question: What aims are possible? As we will see, the answer depends on the macroeconomic theory, which we assume to be “correct” or “good enough”. Different theories may tell us different stories about what aims are possible. For example, Keynesian theory is much more optimistic about the effectiveness of fiscal policy than neoclassical theory (We will analyze the reasons in chapter 3). Furthermore, under neoclassical theory demand-side caused business cycle fluctuations are not possible. Hence according to Keynesian theory demand-side caused business cycle fluctuations can be smoothed by fiscal theory, while under neoclassical theory fiscal policy is not only ineffective but superfluous. So if you think that neoclassical theory describes reality better than Keynesian theory, the question, whether business cycle fluctuations should be a macro-economic aim, does simply not emerge for you - whether you think that smoothing business cycle fluctuations is desirable or not.Another example are economic growth theories: You may find high per capita income growth rates (say 10% or 20% per year) absolutely desirable – if this does not harm the environment or causes an consumption of exhaustible resources. However most economic growth theories tell us that income growth normally causes also a consumption of environmental goods or exhaustible production factors. In this case economic theories tell us that a trade-off exists between income growth and the protection of the environment.

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Digression: The Choice of Macroeconomic Aims (2): This means that a choice has to be made: How much environment shall be sacrificed in order to increase per capita income? The answer to such type of questions depends on „how desirable“ an aim like “income growth” is compared to an aim like “environmental protection”. This leads to the second type of questions “What aims are desirable?”Ad 2: The selection of an economic aim has to rely always on subjective preferences. Such choices can not be based on “objective science”. These choices can only be based on subjective preferences and – if the society as a whole is affected – the members of the society have to find a viable compromise based on their individual preferences. This is certainly no easy task. All that science can do in such “decision forming processes”, is to explain what kind of trade-offs exist between desirable aims. The final choice must be made by society. Such choices are therefore very often called “political choices”.It should be clear that the selection of an economic aim is always an “ethical decision”. Ethical decisions determine “aims of acting”. They are expressed in form of “shall-sentences”. To say “You shall not lie.” or “You shall treat others in the same way you want to be treated.” is of the same methodological nature as to say “Economic growth shall not cause lasting damages to the environment.” or “Business cycle fluctuations shall not be fought by the government, if this is likely to cause an increase of government debt.” Even though such decisions about things that “shall be” (aims of acting) are inevitable and important for every human being, they cannot be based on objective science but are, in last instance, always choices depending on subjective preferences. In ethics we talk of the “trilemma of substantiation” of ethical rules, which many modern philosophers hold to be inevitable, because – if you try to substantiate an ethical decision you always end up with one of three possible states:

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Digression: The Choice of Macroeconomic Aims (3): (1) Infinite regress: You substantiate one reason with another and so on. (2) Logical circle: substantiate an argument with an argument you have already

substantiated. (3) Arbitrary stop: You end the process of substantiation with an argument you

hold subjectively to be “sufficient” and without need for a further substantiation.

Many philosophers believe that state (3) is the only “acceptable”. If you agree (of course by your subjective decision), you agree that ethical decisions are in last instance of subjective nature and can therefore not be binding for others –who might have different subjective point of views.

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➤Macroeconomics deals with three domains:

1. Introduction to Macroeconomics 1.1. What is Macroeconomics?

Macroeconomic Strategies:

Derivation of strategies to reach the selected aims :

How can income growth be influenced to reach a growth target if we postulate the neoclassical growth theory? (Chapter 2)

How can business cycles be affected by macro policy if we postulate the neoclassical or the Keynesian macro model? (Chapter 3 & 4)

How can the selected inflation rate be targeted under neoclassical or the Keynesian macro theory? (Chapter 6)

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Source: Penn World Tables, NBER

Theory: Why is per capita income in some countries higher as in others?

Target selection: What growth rate shall a country target? -2%, 0%, 2%...?

Strategy: How can a selected growth target be realized, if we assume a certain theory to be correct?

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Source: SVG, Jg. 2004/5

These “small” deviations of actual GDP (=green line) from its long-run trend (=black line) are the “business cycle fluctuations”.

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1. Introduction to Macroeconomics 1.2. The Basic Model: The Circular-Flow Model

1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model

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➤ The Circular-Flow model is a basic concept that appears in all macroeconomic models.

➤ It is also the backbone of macroeconomic statistics(“National Accounting”).

➤ It is based on the idea that the economic exchange of goods and production factors between households and firms can be described as a circuit.

1. Introduction to Macroeconomics1.2. The Circular-Flow Model

➤ Its inventor was the French medic François Quesnay (1694 - 1774), who took the idea from the discovery of the blood circuit in those times.

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The Circular Flow Model

Firms

Households

… are Suppliers of Goods on Goods Markets

…are Buyer of Production Factors

…are Supplier of Production Factors

… are Buyer of Goods on Goods Markets

Market Equilibrium Prices Market Equilibrium Prices

Goods

Goods

Production Factors

Production Factors

- Neoclassical Version -

Prices are flexibel and adjust until

supply equals demand!

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The Circular Flow Model

Firms

Households

… are Suppliers of Goods on Goods Markets

…are Buyer of Production Factors

…are Supplier of Production Factors

… are Buyer of Goods on Goods Markets

Goods

Goods

Production Factors

Production Factors

- Keynesian Version -

Market Equilibrium Quantities Market Equilibrium Quantities

Prices are rigid,

therefore supply

quantities adjust to demand

quantities

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Digression: Comments to this Simple Circular-Flow Mo del:

For the sake of clearness, this circular-flow model is a bold simplification:

■ Government and foreign countries are omitted.

■ Business relations between firms (selling and buying of intermediate inputs) are set off and do therefore not appear.

■ Business relations between households (e.g. granting and taking of credits) are set off and do therefore not appear.

■ In chapter 2 we will develop a more realistic version of the circular-flow model.

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1. Introduction to Macroeconomics1.2. The Circular-Flow Model

➤ As the circular flow model shows, households own all the production factors of the economy:■ Households own the labor force and supply their labor to firms

via the labor market.■ Households own the capital (= wealth) and supply their capital to

firms over the various segments of the capital market, e.g.:◆ Households hold saving accounts at banks. Banks offer this

money to firms (=“foreign capital”).◆ Households buy shares of firms (=“own capital”)

◆ Households buy corporate bonds (fixed rate securities) from firms (=“foreign capital”).

◆ In case of a private company, a household has invested its money directly into a firm and owns this firm directly (=“own capital”).

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1. Introduction to Macroeconomics1.2. The Circular-Flow Model

■ Households also own real estate, like production areas and production facilities and rend these to firms and via real estate markets.

■ Some firms do also own real estate. However, in this case firms had to use capital to buy this real estate. This capital belongs finally to households. Hence, in this case firms do not have to pay rents to households but interest or dividends.

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1. Introduction to Macroeconomics1.2. The Circular-Flow Model

■ Our circular-flow model is based on the simplifying assumption that only households and firms exist.

■ If we add up the gross production value (=net production value plus depreciation) over all firms, we would receive the Gross Domestic Product (GDP) of such a simplified economy.

■ However in reality not only households and firms but also the government and foreign countries exist.

■ To make the calculation of GDP realistic, we have to take care for them (and a couple of additional subtleties…).

■ This is done in the next section:

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1. Introduction to Macroeconomics1.3.1. What Is GDP?

1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model1.3. The Basic Data: GDP and its Components

1.3.1. What Is GDP?

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➤Official definition of Gross Domestic Product (GDP):

1. Introduction to Macroeconomics1.3.1. What Is GDP?

“Market value of all final products producedwithin a country in a given period of time.”

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➤ Some Comments on the Definition:■ What means „market value“?◆As is well known, you can’t compare apples and oranges.

Consequently, what is needed is a kind of measure that makes these different products comparable.

◆Therefore, the market price of each product is taken and multiplied by the quantity of each product.

◆This makes sense, because the market price contains the information, what value a product has in the eyes of the producers and consumers.

◆Hence the market price can be taken to evaluate a product.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „products“?◆GDP measures not only tangible products, but also intangible

products – i.e. services.

◆Unofficial Definition: „Services are all those products, which cannot drop on your feet.“

◆Examples for services: Hair cuts, management consultancy, music concerts, foot care, medical treatment, insurance, home help, bank transfer, building design, movies, hotel accommodation, flights, bus rides, trade with goods (!), granting of credits and so on…

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?◆Even though GDP corresponds to the market value of all

goods and services, a simple summation of the market value of all goods and services sold by firms (i.e. their sales) would lead to a mistake as the following example shows:

� A car tire producer sells a tire to a car producer: 1st counting� The car producer attaches the tire to a car and sells this car

to a car dealer: 2nd counting� The car dealer sells the car to the final consumer: 3rd

counting

◆Consequently, this procedure would lead to a multiple counting of the tire and hence an overestimation of actual production.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?◆Solution: To determine the “value added” by the firm, take the

sales of the firm and subtract the payments for all intermediate goods bought by the firm. The result is called “gross value added” of the firm, because it is the “market value” the firm has added to the “market value” of the intermediate inputs.

◆ This leads to the formula:

1. Introduction to Macroeconomics1.3.1. What Is GDP?

= Contribution of the Firm to GDP

= Gross Value Added of the Firm

Intermediate Inputs form other Firms

Sales of Firm

minus

This is the “standard procedure” how GDP is measured. Roughly 80% of German GDP measured this way. However there are many economic activities, where measurement of GDP is much more difficult. These are discussed in the following.

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➤ Some Comments on the Definition:■ What means „all final products“?◆Really all? There are products, whose coverage is difficult:

� Housing stock:

� Houses are “machines”, which produce the service “dwelling”.

� While the services of rental apartments are easily measures by their rent payments, the services provided by self-owned condominiums and houseshave to be estimated.

� To do so, statistical offices use an estimated“market-equivalent” rent for self-owned condominiums and houses. Hence the assumption is made that owners pay rents to themselves.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?

� Home production: � If you prepare a meal in your apartment the value added

created by your work does not enter GDP. If you buy the meal in a restaurant, the value added created by the cook of this restaurant enters GDP.

� If a working women pays a professional cleaner to tidy her apartment, these services are completely accounted for in GDP. If the women and her cleaner marry however, the cleaner’s services are no longer paid for and GDP shrinks.

� => Only production, that reaches the final consumer via a market transaction, is accounted for in GDP.

� => Only home production undertaken by officially registered employees is accounted for by GDP.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?◆Really all? There are products, whose coverage is difficult:

� Home production: � Subsistence farming: A large part of production in

developing countries is production of food by small farms for their own consumption (subsistence farming). Since this production is consumed without market transactions it does not enter measured GDP.

� Since in most developing countries no estimation of the value added by subsistence farming is made by statistical offices (for financial reasons...), an important part of total GDP is not accounted for in these countries.

� Consequently, actual GDP in developing countries is typically significantly larger than GDP as measured by statistical offices.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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Proposal in the latest System of National Accounts Revision (SNA 2008) by the UN Statistical Commission for the coverage of goods and services not sold over markets (“non-monetary sectors”).

This includes i.a. subsistence farming and barter trade.

Problem: Many developing countries still have not the financial means to make the necessary estimations...

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➤ Some Comments on the Definition:■ What means „all final products“?◆ The shadow economy is another area, where coverage by

national accounting is difficult, because producers do not pay taxes or provide production data to statistical offices. ◆Until recently, the Federal Statistical Office of Germany (FSO)

has estimated the level non-taxed value added creation in legal sectors only. ◆Starting with September 2014, the FSO provides also estimates

of the value added of illegal activities.

o Drugso Smuggling

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?◆Black market economy:

� Drugs: Based on the „Epidemiological Survey of Substance Abuse“ by the Munich „Institut für Therapieforschung“ the FSO calculates value added for 5 different drugs: Heroin, Cocaine, Ecstasy, Amphetamine and Cannabis.

� Since, with exception of Cannabis, production takes typically not place in Germany, the value added created by these sectors results mostly from the „trade margin“, i.e. the difference between „street prices“ and import prices. These prices are regularly gathered and published by the Federal Office of Criminal Investigation (Bundeskriminalamt).

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?◆Black market economy:

� Smuggled goods: Here the FSO focuses on the estimation of smuggled cigarettes. Information is provided by the “Waste Disposal Study” of the German cigarette industry. The cigarette industry draws a sample of the tax strips from trashed cigarette packages found in the “Yellow Bags”.

� Packages with tax strips from countries not known as typical “holiday countries” and where cigarette prices are significantly lower as in Germany, are regarded as “smuggled”.

� Here too, the value added mostly results from the „trade margin“, i.e. the difference between „street prices“ and import prices

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ Some Comments on the Definition:■ What means „all final products“?◆Another area, where the coverage of GDP is incomplete,

are the services provided by the government, parties, trade unions, churches and other non-profit organizations.

◆These organizations provide the largest part of their services for free to their clients, i.e. without measurable payments. Hence no market prices exist to evaluate their services.

◆Therefore, statistical offices estimate the production value of non-profit organizations by (essentially) their payroll costs. Thereby they assume that the value of goods and services produced by the employees of these organizations equals the value of their wages and salaries.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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Digression: Internally-generated investment goods and R&D Not all produced goods are sold by firms. Some goods are used within a firm as investment goods. ■ Example: The engineering team of a carmaker constructs a production machine

used to produce cars within the firm

In this case, the estimated market value of the investment good is added to thesales of the firm. However the market value of the intermediate inputs, used to produce the investment good, is not subtracted, since an investment good (typically a machine) is not completely worn off within one year. Instead only an estimate of the yearly erosion of the machine, called “physical depreciation” is subtracted.According to the the latest Revision of the “System of National Accounts” (SNA2008) research and development expenditures (R&D) are no longer part of production costs but have to be treated like investment goods. As a result, all R&D activities (whether they lead to product or process innovation or not !) increase the value added produced by the firm. The argument of the FOS is a bit philosophical: There is no unsuccessful R&D, because the company increases its “knowledge capital” even if R&D does not lead to product or process innovation. In other words, we even learn from out mistakes...

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➤ Some Comments on the Definition:

■What means „within a country“?◆GDP measures only goods and services produced

within a country regardless by whom:

• If somebody from Strasbourg works in Freiburg, this is accounted for as German GDP. If somebody from Freiburg works in Strasbourg, this is accounted for as French GDP.

◆Therefore, the GDP-concept is also called „inland concept“ (contrary to the „inhabitant concept“ on which the calculation of Gross National Product (GNP) is based.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ To sum up:■ Definition of GDP: Market value of all final goods and

services produced within a country in a given period of time

◆ „Market Value“ = Evaluation with Market Prices

◆Adjustment for intermediate inputs to prevent multiple counting.◆ „all Final Goods and Services“ => Accounting Problems:

• Self Owned Condominiums and Houses, • Home Production,

• Non-profit Organizations• Shadow Economy

◆Accounting for domestically produced goods and services only.

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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➤ The measurement of GDP is internationally standardized by the UN. Standardized numbers are available at the Statistical Office of the UN:

■ http://unstats.un.org/unsd/snaama/selectionbasicFast.asp

➤Within the EU more detailed subaggregates of GDP are available (ESVG 1995) at the Statistical Office of the European Commission:

■ http://ec.europa.eu/economy_finance/ameco/user/serie/SelectSerie.cfm

➤…and from the statistical office of the EU (EUROSTAT):

■ http://epp.eurostat.ec.europa.eu/portal/page/portal/statistics/search_database

1. Introduction to Macroeconomics1.3.1. What Is GDP?

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1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model1.3. The Basic Data: GDP and its Components

1.3.1. What Is GDP?1.3.2. Three Ways of Computing GDP

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➤ GDP is defined according to the way it is produced (“production account”). However, following the circular flow model, there are three ways how GDP can be calculated:

1. Production Account: “Making of the Cake”

2. Distribution Account: “Distribution of the Cake”

3. Expenditure Account: “Consumption of the Cake”

➤ The same cake is subdivided by three different kind of criteria:

1. Production Account: What is the contribution of a certain industry to GDP?

2. Distribution Account: What kind of economic units receive how much of GDP?

3. Expenditure Account: For what kind of purposes is GDP used?

1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

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1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

Production Account

„Making of the Cake“

Distribution Account

„Distribution of the Cake“

Expenditure Account

„Consumption of the Cake“

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1. GDP by Production Account:■ The production account of GDP follows directly the above

definition of GDP, i.e. the “Market value of all final goods and services produced within a country in a given period of time” is calculated.

■ In a world with firms only (and no government, non-profit organizations, private households and black market activities), GDP would equal the sum of gross value added of all firms:

Value Added of all Firms= Sum of Market Sales of all Firms./. Sum of Intermediate Inputs of all Firms

1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

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Digression: Peculiarity of the official statistic de finition

Following the official statistic definition, we have to take care for a statistical convention, which disturbs this intuitively appealing relationship: Following the official definition, the value added tax paid by firms does not count as “value added by firms”, while the subsidies received by firms do count as “value added by firms”. Given this convention, the formula for calculating GDP equals then:

Gross Value Added of all Firms= Sales of all Firms

./. Sum of Intermediate Inputs of Firms

./. Value Added Tax Paid by Firms+ Subsidies received by Firms

In the following we will neglect this peculiarity for the sake of simplicity!

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1. GDP by Production Account:■ In a world with only firms, value added calculated by this

formula would actually equal GDP.

■ And in fact, value added by firms does count for about 80%of all GDP in most countries.

■ However, as already mentioned in section 1.3.1., we have to take care that beside firms there are governments, non-profit organizations, private households and illegal production activities, where value added is created.

■ Since these entities do not sell most of their production over (legal) markets, their value added are estimated.

■ The resulting number is then added to the value added of firms to finally yield GDP.

1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

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1. GDP by Production Account:

■ After taking care of all these details, the final formula for GDP measured by production account equals:

GDP = Value Added of Firms

+ Value Added of illegal economic units

+ Value Added of Government and Non-profit

Organizations

+ Value Added of households

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1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

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48 %

71 %

48 %

28 %

Source: SVG, Jg. 2004/5; 1) Without balance of value added tax and subsidies; 2) inclusive value added of households and non-profit organizations, without value added by illegal economic units)

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1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

Production Account

„Making of the Cake“

Distribution Account

„Distribution of the Cake“

Expenditure Account

„Consumption of the Cake“

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2. GDP by Distribution Account:■ GDP by distribution account explains how GDP is

distributed between workers, capital owners and the government. The standard definition is:

GDP = Net Compensation of Domestic and Foreign Employees (salaries and wages) and Self-Employed Working within the Country

+ Net Income from Wealth held within the Country(= Interest Payments, Dividends, Profits , Rents…) by Natives and Foreigners

+ Indirect Taxes1) ./. Subsidies2)

+ Direct Taxes3) ./. Social Transfers4)

+ Depreciation

„Net Tax Burden “

1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

1) Value Added Tax; 2) Subsidies to firms; 3) Taxes on Salaries- & Capital Income, Wealth, Car Tax, Social Security Contributions of Employees and Employers, Direct Taxes of Incorporated Enterprises; 4) Social Aid, Housing Subsidies, Governmental Allowances to Unemployment Compensation etc.

= Withdrawals for reinvestment made necessary by the erosion of machines

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2. GDP by Distribution Account:■ …according to currently available data:

GDP = Gross Compensation of Domestic and Foreign Employees (salaries and wages) and Self-Employed Working within the Country

+ Net Income from Wealth held within the Country (= Interest Payments, Dividends, Profits , Rents…) by Natives and Foreigners

+ Indirect Taxes1) ./. Subsidies2)

+ Depreciation

1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

1) Value Added Tax; 2) Subsidies to firms; 3) Taxes on Salaries- & Capital Income, Wealth, Car Tax, Social Security Contributions of Employees and Employers, Direct Taxes of Incorporated Enterprises; 4) Social Aid, Housing Subsidies, Governmental Allowances to Unemployment Compensation etc.

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1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

Production Account

„Making of the Cake“

Distribution Account

„Distribution of the Cake“

Expenditure Account

„Consumption of the Cake“

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3. GDP by Expenditure Account:■ GDP by expenditure account explains how the GDP is used.

The standard definition is:

GDP = Consumption of Households (= C)

+ Government Consumption (= G)

+ Depreciation (= λ *K)

+ Net Investment (= NI)

+ Exports (= X) ./. Imports (= M)

„Gross Investment“

1. Introduction to Macroeconomics1.3.2. Three Ways of Computing GDP

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- 56 -Prof. Dr. Rainer MaurerSource: SVG, Jg. 2004/5; 1) Including Change of Stocks

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GDP at Market Value by…

Production Distribution Expenditure

Gro

ss

Inve

stm

ent

Gro

ss V

alue

Add

ed

TGovernment Consumption2)

Depreciation

Net Income from Wealth within the Country by Nationals & Foreigners

Net Compensation of Domestic and

Foreign Employees and Self-Employed Working within the

Country

Consumption of Households

T ≈ Direct Taxes ./. Social Transfers + Indirect Taxes

./. Subsidies

Exports ./. Imports

Net Investment of Firms

Depreciation

DG

Gross Value Added3) of Firms,

Government1)

Non-profit Organizations1)

and Private Households

1) Estimated: Value Added of Government = Government Consumption ./. Purchase of Intermediate Goods by the Government.2) Estimated: Government Consumption = Employment Compensation & Government Purchases of Goods and Services3) According to the official definition (s. digression) “value added tax ./. subsidies” must still be added. This is neglected here for simplification,

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1. Introduction to Macroeconomics1.3.3. Nominal vs. real GDP and the GDP-Deflator

1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model1.3. The Basic Data: GDP and its Components

1.3.1. What Is GDP?1.3.2. Three Ways of Computing GDP

1.3.3. Nominal vs. real GDP and the GDP-Deflator

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➤ Once again – the definition of GDP:

■ “Market value of all final goods and services produced within a country in a given period of time.“

➤ „Market value“ means that the quantities of all goods and services are multiplied with their market prices before they are added up (apples and oranges – problem…).

➤ This means however:■ If the prices of all goods and services, grew with a rate of nearly

2% per year (= target inflation rate of the European Central Bank), GDP as defined above would grow by 2% - even if the actual (real) production of goods were constant!

➤ In order to eliminate this effect of inflation on GDP statistical offices calculate “real GDP”.

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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➤Determination of „real GDP“:■ Instead of evaluating apples and oranges with their

current prices ( = nominal GDP), they are evaluated withtheir prices in an (arbitrarily) fixed year.

■ This year is called the “base year”.

■ Consequently, “real GDP” of the year 2008 at prices of the year 1995, informs about the level of GDP in the year 2008, if prices since 1995 had stayed constant.

■ As a result, the yearly increase in all prices, which has taken place form 1995 to 2008 ( = the rate of inflation) is eliminated from real GDP!

■ The following simplified example illustrates this method.

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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Year

Produced Appels Produced Oranges GDP

Quantitykg

Price€

Quantitykg

Price€

nominalreal

(Prices=2001)

2000 100 10 50 30 2500 4000

2001 150 20 100 40 7000 7000

2002 300 30 150 50 16500 12000

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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➤Determination of „real GDP“:

➤ This calculation of real GDP shows:

■ If positive inflation was prevalent from the past to the present,◆ real GDP before the base year is always larger than

nominal GDP,

◆while real GDP after the base year is always smaller than nominal GDP.

➤ A comparison of real and nominal GDP shows this:

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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- 63 -Prof. Dr. Rainer MaurerSource: AMECO, EU-Commission

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➤ The elimination of inflation also implies that in times of positive inflation – the growth rate of nominal GDP is always larger than the growth rate of real GDP.

➤ This too follows from our numerical example:

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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Year

GDP GDP-Growth

nominalreal

(Prices=2001)

Nominal(= with

Inflation)

Real (= withoutInflation)

2000 2500 4000 - -

2001 7000 7000(7000-2500)

/ 2500)

= 180 %

(7000-4000) / 4000)

= 75 %

2002 16500 12000(16500-7000)

/ 7000 )

= 136 %

(12000-7000) / 7000)

= 71 %

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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➤A Useful Side-Effect:■ The calculation of real GDP also delivers an indicator for

the rate of inflation.◆To do so, first the value of nominal GDP of each year is

divided by the value of each year’s real GDP.

◆The result is a times series called “GDP-Deflator”

◆Then, the growth rate of this GDP-Deflator corresponds to the rate of inflation of all goods and services – since GDP embraces the value of all goods and services.◆Applied to our numerical example, the following results:

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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➤Definition of GDP-Deflator:

➤Memory hook:

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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Jahr

GDPGDP-Deflator

(=„Price Level“)

Inflation Rate(=„Change ofPrice Level“)nominal

real(Prices=2001)

2000 2500 40002500 / 4000

= 62,5 %-

2001 7000 70007000 / 7000

= 100 %

(100 - 62,5) / 62,5 = 60%

2002 16500 1200016500 / 12000

= 137,5 %

(137,5 - 100) / 100

= 37,5 %

1. Introduction to Macroeconomics 1.3.3. Nominal vs. real GDP and the GDP-Deflator

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Digression: From GDP-Deflator to GDP-Chain Price Index

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Digression: From GDP-Deflator to GDP-Chain Price Index

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- 71 -

1%

yoy

This increase in the GDP-Deflator corresponds to an

average yearly rate of inflation of 2,8 %

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1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model1.3. The Basic Data: GDP and its Components

1.3.1. What Is GDP?1.3.2. Three Ways of Computing GDP

1.3.3. Nominal vs. real GDP and the GDP-Deflator1.3.4. From GDP to „Disposable Income of Households”

1. Introduction to Macroeconomics 1.3.4. From GDP to „Disposable Income of Households“

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➤One more time – the definition of GDP:

■ “Market value of all final goods and services produced within a country in a given period of time.“

➤ Consequently, GDP reflects the “production potential” of a country.

➤ There are, however, problems – e.g. market potentialanalysis – where not the “production potential” but the “purchasing power” of the population of a country is in the center of interest.

➤ It is evident that there must be a link between “production potential” of a country and the “purchasing power” of its population, but it is also evident that there are differences.

➤Where exactly are those differences?

1. Introduction to Macroeconomics 1.3.4. From GDP to „Disposable Income of Households“

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➤ The purchasing power of the population of a country depends of course primarily on the income of the population. The income of the population differs in several points from GDP:

1. GDP does not include income of inhabitants earned abroadand GDP does include income of foreigners earned within the country.

2. GDP does include capital depreciation. Since depreciation corresponds to capital goods that are consumed in production of other goods, it cannot be part of household income.

3. A part of GDP flows to the government in form of taxes. Hence this part of GDP too cannot be part of household income.

➤ Therefore the following adjustment of GDP does make sense:

1. Introduction to Macroeconomics 1.3.4. From GDP to „Disposable Income of Households“

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➤ From GDP at market prices to national income:Gross Domestic Product at Market Prices

./. Depreciation= Net Domestic Product at Market Prices

./. indirect Taxes + Subsidies= Net Domestic Product at Factor Prices

+ Income of Inhabitants Abroad./. Income of Foreigners Within the Country

= Net National Income at Factor Prices./. Direct Taxes (Taxes on Labor & Wealth Income etc.)+ Social Transfers (=Social Benefits, Child Benefits etc.)./. Interest on Consumer Credits1)

= Disposable Income of Households

1. Introduction to Macroeconomics 1.3.4. From GDP to „Disposable Income of Households“

1) These interest payments are subtracted by the statistical offices, because they are “in the short term” not available for purchases. This is a little bit arbitrary, since the same holds for rents, insurance fees etc., which are not subtracted!

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➤ As this decomposition shows, “disposable income of households” is the aggregate that should be used for “market potential analysis”.

➤ It is therefore often simply called “purchasing power”.

➤ In many countries it is available on the regional level. In Germany for example on the level of districts (“Kreise”).

➤ Only if other numbers are not available, GDP should be used for such kind of analysis.

➤ If however possible, one should try to correct GDPtowards an aggregate that comes closer to disposable income.

Pforzheim

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1.1. What is Macroeconomics?

1.2. The Basic Model: The Circular-Flow Model1.3. The Basic Data: GDP and its Components

1.3.1. What Is GDP?1.3.2. Three Ways of Computing GDP

1.3.3. Nominal vs. real GDP and the GDP-Deflator1.3.4. From GDP to „Disposable Income of Households“

1.3.5. GDP and „Welfare“

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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➤ Should GDP be used as an indicator of welfare?■ Of course, “welfare” is a somewhat “cloudy” expression.■ However, commonly welfare means the economic

well-being of people.■ Certainly, economic well-being depends stronger on

disposable income but GDP.■ Therefore, disposable income is a better indicator for

welfare.■ There are, however, other objections against the

explanatory power of GDP – and also disposable income – as an indicator of welfare!

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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➤Should GDP be used as an indicator of welfare?

■Non-market production: As already seen, GDP measures only goods and services, which are traded over markets. Home production (education of children, cooking, housekeeping, subsistence agriculture…) is not captured, even though it does of course affect the welfare of people too.

■Leisure time: In a country where people have a strong preference for consumption (and hence for a high income that makes high consumption possible) GDP will be larger than the GDP of a country where people have a strong preference for leisure time. Nevertheless, people of both countries may have the subjective impression that they share the same level of welfare.

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

Source: IAT Gelsenkirchen

Average Yearly Working Hours per Employee in the Year 2004

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➤Should GDP be used as an indicator of welfare?

■ Environment: Environmental protection consumes inter-mediate products (air cleaner, clarification plants…), which can therefore not be used to produce final goods. The benefits from environmental production are not sold over markets and therefore not captured by GDP. If instead final products, which are sold over markets, were produced, this would be captured by GDP. Hence, environmental protection reduces measured GDP, even though the positive effect of environmental protection on welfare can be larger than the negative effect of a lower GDP on welfare.

■ Income distribution: A high GDP might come along with a very uneven distribution of income. Therefore, an analysis of economic welfare should not only reflect the level of GDP and the like, but also take care about measures of income distribution.

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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➤ Should GDP be used as an indicator of welfare?■ Capabilities: Disposable income measures only purchasing power

available to people. What people can do with this purchasing power does also depend on other factors like:◆ personal health,◆ personal education,◆ access to information,◆ legal framework,◆ political freedom

and so on. Therefore, the same level of income can grant a person more or less implementation options (or in the words of Amartya Sen “capabilities”) depending on these factors. For example: (1) A severely handicapped or sick person can enjoy a high income level not in the same way as a healthy person. (2) A person with a low education level or restricted access to information will typically know less options, how to spend income, than a well-educated person or a person with full access to all relevant information.

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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➤ Should GDP be used as an indicator of welfare?■ Capabilities:◆Consequently, the same income level can go along with quite

different levels of attainable “capabilities”.◆ “Capabilities” are however hard to measure, since they depend

on “soft factors”, which lack statistical coverage.◆Nevertheless, some factors, which are likely to have a significant

impact on “capabilities”, are available, e.g.:o life expectancy ando average education level.

◆ Therefore, the United Nations have started a project, where every year since 1990 a so called “Human Development Index” (HDI) is calculated for 169 member countries.◆ The HDI is calculated according to the following definition:

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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➤ Should GDP be used as an indicator

of welfare?■ Capabilities:

Definition of Human Development Index:

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

HDI=

GNP= Gross National Product scaled between 1 and 100

EDU= Education Index scaled between 1 and 100

LE= Live Expectancy scaled between 1 and 100

An index number between 1 and 100

= GDP+ Income of inhabitants abroad ./. Income of foreigners within

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A ranking of countries according to the HDI yields a difference of only 5% compared to a ranking based on Per-Capita GNP

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Digression: Rank Correlation CoefficientExample 1:

Definition: Rank Correlation Coefficient:

Country List 1

Country Name Rank

CountryA 1

CountryB 2

CountryC 3

Country List 2

Country Name Rank

CountryA 1

CountryB 2

CountryC 3

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Digression: Rank Correlation CoefficientExample 2:

Definition: Rank Correlation Coefficient:

Country List 1

Country Name Rank

CountryA 1

CountryB 2

CountryC 3

Country List 2

Country Name Rank

CountryA 3

CountryB 2

CountryC 1

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Digression: Rank Correlation CoefficientExample 3:

Definition: Rank Correlation Coefficient:

Country List 1

Country Name Rank

CountryA 1

CountryB 2

CountryC 3

Country List 2

Country Name Rank

CountryA 2

CountryB 1

CountryC 3

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A ranking of countries according to life expectancy yields a difference of 15% compared to a ranking based on Per-Capita GNP

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A ranking of countries according to mean years of schooling yields a difference of only 24% compared to a ranking based on Per-Capita GNP

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➤ Should GDP be used as an indicator of welfare?■ Capabilities:◆As these diagrams show, GNP contains a lot of information

about life expectancy and the education level.◆As we have already seen, it does also contain valuable

information about the relationship between the business cycle and the labor market in each country.◆ Taken together, one can come to the conclusion that GNP

contains a lot of very different information which is quite usefulfor the discussion of macroeconomics questions.

1. Introduction to Macroeconomics 1.3.5. GDP and „Welfare“

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1.4. Questions for Review

➤You should be able to answer the following questions atthe end of this chapter. All of the questions can beanswered with the help of the lecture notes. If you havedifficulties in answering a question, discuss this questionwith me at the end of the lecture, attend my colloquium orsend me an E-Mail.

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1. What is the difference between micro- and macroeconomics?

2. What is the relation between macroeconomic theories, aims and strategies?

3. What kind of questions are typical for macroeconomic theory, what for the discussion of macroeconomic aims?

4. Explain the circular flow model of an economy.

5. What kind of conclusions can be dawn from this model?

6. Who owns the production factors of an economy?

7. Explain the fundamental equation of the circular-flow model.

8. Define GDP.

1.4. Questions for Review

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11. How does the calculation of GDP take care of the “apples and oranges” problem?

12. What kind of information contains the market price of a good?

13. What are services?

14. Are services covered by the calculation of GDP?

15. You buy a CD-player. Do you buy a service or a good?

16. You visit a music concert. Do you buy a service or a good?

17. What kind of products are not correctly captured by GDP?

18. You decide to take your meals further on in restaurants only. What is the effect of your decision on GDP?

1.4. Questions for Review

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19. A household aid marries his former employer. What effect has this marriage on GDP?

20. What difficulty emerges in interpreting the GDP of countries with a large sector of agricultural subsistence?

21. What are “non-profit organizations”?

22. How does the production of institutions, which grant their products and services for free to their customers, enter the calculation of GDP?

23. Why does adding up the sales of firms does not lead to GDP?

24. Explain the problem of “multiple count” based on an example.

25. What role play “intermediary goods” in the calculation of GDP?

1.4. Questions for Review

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26. Does a Swiss citizen working in the town of Konstanz affect the German GDP?

27. Does a German citizen, who runs a firm in Austria, affect the German GDP?

28. Does a German citizen, who works in a bank in Luxembourg, affect the German national income?

29. You sell your two years old Maserati at eBay. How does this transaction affect the current GDP?

30. What are the three ways of calculating GDP?

31. Specify the components of GDP following the three ways of calculating GDP.

1.4. Questions for Review

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32. How is value added of firms, of the government and private Households computed?

33. What kind of aggregate should be the base of an analysis of market potential of a country or a region?

34. What is the definition of “depreciations” as contained in GDP?

35. How is the aggregate called that results, if you subtract depreciation form GDP?

36. Explain the derivation of disposable income starting with GDP.

37. Specify four reasons that reduce the appropriateness of GDP as a measure of wealth.

1.4. Questions for Review

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38. What factor has to be considered, if the GDP of 1994 has to be compared with the GDP of 2002?

39. The nominal GDP of country A was 100 000 € in the year 1950 and 130 000 000 € in the year 2000. In the same span of time the BIP-Deflator has grown with an annual rate of 5% per year. The nominal GDP of country B was 250 000 € in the year 1950 and 120 000 000 €in the year 2000. In the same span of time the GDP-Deflator has grown with an annual rate of 2%. Which country has experienced the strongest growth of real GDP?

40. What is the difference between nominal and real GDP?

41. What is the definition of the GDP-Deflator?

42. How is the GDP-Deflator affected, if all prices stay constant compared to the base year and only the real production quantities of goods change?

43. What is the relationship between GDP-Deflator and the rate of inflation?

1.4. Questions for Review

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Year

Apples Oranges GDP

Quantity

kg

Price

Quantity

kg

Price

real (Prices =

2000)

real (Prices =

2002)

2000 100 10 50 30

2001 150 20 100 40

2002 300 30 150 50

46. Use the number in the following table to determine real GDP at prices of the year 2000 and at prices of the year 2002.

1.4. Questions for Review

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Year 2000 2001 2002 2003 2004 2005 2006

Unity Bn. Euro

Nominal GDP 2063 2113 2143 2162 2207 2241 2307

Real GDP (Base 2000) 2063 2088 2088 2084 2110 2129 2186

Nominal GDP Growth

Real GDP Growth

GDP-Deflator

Rate of Inflation

48. Calculate the missing numbers.

1.4. Questions for Review

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49. Find the value of “Net Income from Wealth within the Country by Nationals & Foreigners” from the following numbers of the National Accounts:

Net Taxes (T) = Direct Taxes ./. Social Transfers + Indirect Taxes ./. Subsidies = 250 €, Consumption of Households = 500 €, Net Investment of Firms = 100 €, Exports = 300 €, Gross Investment = 150 €, New Indebtedness of Government (DG) = 100 €, Imports = 200 €,

Net Compensation of Domestic and Foreign Employees and Self-Employed Working within the Country = 600 €.

1.4. Questions for Review

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GDP at Market Value by…

Production Distribution Expenditure

Gro

ss

Inve

stm

ent

Gro

ss V

alue

Add

ed

TGovernment Consumption2)

Depreciation

Net Income from Wealth within the Country by Nationals & Foreigners

Net Compensation of Domestic and

Foreign Employees and Self-Employed Working within the

Country

Consumption of Households

T ≈ Direct Taxes ./. Social Transfers + Indirect Taxes

./. SubsidiesValue Added Tax

./. Subsidies

Exports ./. Imports

Net Investment of Firms

Depreciation

DG

Gross Value Added of Firms, Government1)

Non-profit Organizations and Private Households

1) Estimated: Value Added of Government = Government Consumption ./. Purchase of Intermediate Goods by the Government.2) Estimated: Government Consumption = Employment Compensation & Government Purchases of Goods and Services