Febrero 20, 2008 Integración de Riesgos de Mercado y Crédito Valuacion y Riesgo en Derivados de Credito y Structured Finance (ABS, MBS y CDO) Dan Rosen,

Febrero 20, 2008

Integración de Riesgos de Mercado y Crédito

Valuacion y Riesgo en Derivados de Credito y Structured Finance (ABS, MBS y CDO)

Dan Rosen, R2 Financial Technologies and Fields Institute

www.R2-financial.com

Introduction: Integration of Market and Credit Risk

• Trading book: credit risk and market risk are entangled– Direct issuer/borrower risk – bonds, loans

– Counterparty credit risk (CCR) – derivatives

– Credit derivatives – indirect issuer/borrower, counterparty

• Credit derivatives and Structured Finance portfolios– Single name (CDSs)

– Portfolio: synthetic and cash (underlying loans, bonds, ABS/MBS)

• Key issues– Pricing: market and credit risk are intrinsically linked (credit spreads, PDs

and LGDs, credit migration)

– Risk measurement: market vs. credit events, liquidity, horizons

• Basel II capital: IDR (+ event risk) & CCR (credit) capital, securitization

framework

Context – in the News…

Yesterday, WSJ

• “Credit Suisse cut the value of some asset-backed securities by

$2.85 billion, blaming some of the hit on "mismarkings and

pricing errors" by traders…”

• Now, Lehman Gets Pelted. Many investors have been surprised at

the ability of Lehman Brothers Holdings Inc. to navigate the credit

crunch, given the size of its exposure to potential land mines. But…

Lehman is sitting on a big pile of commercial real-estate loans,

and… credit markets have worsened… now facing a write-down in

the $1.3 billion range…”


Monday

• “The government decided to nationalise Northern Rock on

Sunday, abandoning a five-month attempt to snare a private sector

buyer for the ailing bank…”

– “The fifth-largest mortgage lender has borrowed 25 billion

pounds from the Bank of England since its funding model

collapsed in the credit crisis last year, sparking the first run on

deposits at a British bank for some 140 years.”

“Sources: Reuters, Risk, Banking Technology,, Dow Jones, FT,, G&M,

Bloomberg


• “Subprime crisis worse than 1998, says S&P”

• “Bifurcation or Meltdown… Since BS spectacularly announced an

initial $3.2B rescue of BSAM HG structured credit fund (June 22),

funds…have seem to topple like dominoes…”

• “Edward Cahill, head of European CDOs at BarCap has resigned…

decision comes after… two structures downgraded by S&P… by

16 notches, with the most senior notes going from AAA to CCC+”

Sources: WSJ, Reuters, Risk, Banking Technology,, Dow Jones, FT,

Bloomberg


• “It all happened exactly like he said it would happen... In every

single detail…”

– “The hedge fund creator's name was John Paulson… by

making between $3 billion and $4 billion for himself in 2007,

he appears to have set a Wall Street record… no one has

ever made so much so fast.”

• Investors blaming a “1 in 10,000 years” event…

Sources: Reuters, Risk, Banking Technology,, Dow Jones, FT,, G&M,

Bloomberg

Context – Rare Event? Black Monday’s 20th Anniversary

• Oct 19th 1987 – DJ Industrial average fell almost 23% in a single day… “Taking other world indices down with him and creating fear of a global

recession and a permanent change to the way investors look at financial markets”

• A 23% one day change is a very, very rare event (“standard” risk models)

• Rare events seem to be not so rare….– e.g., from 1926-2000, there were nine crashes in the DJI Index that exceeded

6-sigma in a single day (based on the previous 250 business days)

• From data: actual likelihood of a 6-sigma crash occurring on any given day= 0.04%.

– If model was right: how likely are these observed historical evenets?

• Assume daily returns are independent Normal–probability of a single 6-sigma event on any given day is about 10-9 (significantly less than 0.04%)

• The probability of one event in 84 years is then about 0.002%; the probability of nine 6-sigma events occurring in 84 years is about 10-43…

S&P/Case-Shiller: database with 20 years of home prices (some metropolitan areas covered for 20 years, other for a shorter period)

What caused the sub-prime crisis?

Signs anyone?

• Dramatic and steady increase in

home prices for 1996-2006

• Unsustainable level of price

increases – peak of 20% annual

increase in 2005 (far beyond

inflation or increase in income)

• Early signs of “bubble” bursting

with decelerating prices for the last

24 months (negative slope to the

annual % increase) and actual

falling prices all through 2007



1. Lending: complex products offered to sub-prime borrowers – subject to misunderstanding/misrepresentation

– Origination of mortgages and MBS issuance used to be dominated by loans to prime borrowers (conforming to underwriting standards)… Until very recently…

– By 2006, origination: non-agency ($1.5 trillion) > 45% larger than agency; Issuance: non-agency ($1.03) 14% larger than agency)

2. Arrangers: reduced incentives to conduct own due diligence without due diligence of the asset manager

– Arranger was able to limit its funded exposure to securitizations of risky loans, as the market for credit derivatives developed

3. Predatory borrowing & lending worsened friction between originator and arranger

4. Investors: mandates not adequately distinguishing structured & corporate ratings– Asset managers’ incentives: “reach for yield” – purchase structured debt issues with

the same credit rating but higher coupons than corporate issues (Friction #6)

5. Significant error in credit ratings to subprime MBS– Investors lacked ability to evaluate the efficacy of models– Lack of transparency in marking and inability to model structures

Source:* Ashcraft and Schuermann 2008

Lessons Learned from the Sub-Prime Crisis

• Assessment of risk (and ratings) of CDO tranches

– Home prices in the US could not continue to increase indefinitely

• Risk function: analyze what would happen once home prices fall

– Strong conditional systematic factor: falling home prices

• Default rates of subprime mortgages and correlation of default of

ABS tranches

– Regime switch? Default rates and ABS tranche’s correlations

based on the benign period of 1996-2006 (housing prices

continually rising), are not applicable in a falling price

environment

Lessons Learned from the Sub-Prime Crisis

• Signs that house prices were about to fall by end 2006 – Some people bet on this (e.g. Goldman, Paulson)

• Assessment of risk concentrations (lack of diversification) – A primary error made by rating agencies and others: assume that ABS

tranches in a CDO are highly diversified – default correlation equivalent to corporate bonds of different issuers

• Models need to take into account • Changes in the nature of the subprime mortgages (e.g. lower standards on

documentation)

• Effect of changed standards on default and correlations (when housing prices fall)

• Systematic factors and nature of data

• Transparency, transparency, transparency…– Structure, MtM, risk

– Investment decisions cannot rely solelely on simple ratings measures

CDO Valuation and Risk ModellingCurrent State

• Valuation of synthetics – Gaussian copula framework still prevalent– Pricing bespoke portfolios is difficult and not standardized – models generally ad-hoc

– Dynamic models and detailed bespooke models still in infancy (application and hedging)

• Valuation of cash CDOs – difficult, computationally intensive, not standardized– IR, spreads, prepayment, credit (and correlation) risks

– Structures are complex and opaque

– Simple “bond models” and matrix pricing generally used

– Advanced models are fairly new or not yet fully developed for all asset classes

– Standardized calibration is difficult to achieve

• Risk modelling for Credit Derivatives and SF assets is immature (still in its infancy)– Market risk… vs. credit risk

– Generally used simple market risk sensitivities (e.g. CR01, etc.)

– Computationally intensive risk applications (e.g. name-specific sensitivities)

– VaR (market and credit) measures not easy and contribution measures not well defined

– Correlation is very important & difficult to assess in SF – not widely used or standardized

Valuation and Risk Measurement Systems – Current State

• Difficult to build a fully integrated solution for valuing and managing the risk of ABS/MBS and CDO portfolios (in particular cash CDOs)

• Managers and dealers developed and maintain costly in-house capabilities for internal use

– Multiple components, analytics and data sources, – Systems do not generally provide good and consistent pricing for business users, in a timely

basis, nor flexible risk management and reporting capabilities– In-house solution consisting of multiple ad-hoc (excel-based) solutions to model cash-flows,

generate scenarios,

• Investors generally rely on (multiple) periodic valuations and reports provided by dealers (or valuation “opinions”)

– Simple integration into their systems– Little or no risk capabilities: stress testing, concentration reports, etc.

• Modelling and valuation are difficult – model risk, lack of liquidity and price transparency, structure transparency and data

• Developing a consistent and practical risk measurement methodology and infrastructure is difficult –interaction of market and creidt risk

Valuation Methods for SF and CDOs

Models to value CDOs (CBOs, CLOs, ABS, etc.) can be classified as

1. “Risky” Bond models (single scenario)

2. Stochastic models (simulation)

– Static, dynamic

– Top-down, bottom-up

– Collateral market value models (NAV-based models)

1. Risky Bond Models for CDOs

• Single-scenario modelling – Deterministic cash-flow approach

• No direct modelling of correlations, optionality and non-linearities in structure

• Detailed cash-flow modelling of collateral pool and of CDO waterfall– Pool level assumptions and loan-level assumptions and clustering

• Comparative pricing via matrix approach– Scenario assumptions, discount spreads (premiums)

• Efficient stress-testing framework

tXsrT

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1

... vintage,sector, rating, ,...,, XLGDDefPPY

• Step 3: Use collateral CFs and CDO waterfall to generate CDO cash flows

• NPV – discount cash flows with appropriate discount rates

• Discount rates (spreads) – from comparable market quotes where available– Knowing cash flows for that CDO, and assuming

that the market value equals the NPV, one can calculate the spread for that tranche

– Application of discount rate to all other tranches with the same rating, deal type, vintage, etc.

Discount

Discount

Discount

Discount

Collateral Model

CDO Model

Defaults

Recoveries

Prepayments

Collateral Cash Flows

Senior Cash Flow

Mezz Cash Flow

Junior Cash Flow

Equity Cash Flow

Price

Price

Price

Price

• Step 1: Gather collateral cash flow assumption vectors (CPR, CDR, recovery)– e.g. assumptions by

type of CDO collateral (e.g. CRE, ABS, loan, bond)

– For ABS CDOs, can use loan performance analysis on the loans in each ABS

• Step 2: Generate cash flows (e.g. using Intex) for each piece of collateral – Using given

assumption vectors

1. Risky Bond Models

2. Stochastic Models

• Standard valuation technique for derivatives (option-theoretic approach)– Multi-scenario approach (via structured scenarios, MC, analytics)

– Captures explicitly key risks: credit (default, LGD, spread), prepayment, market risk

– Portfolio risk – correlation

– “Arbitrage-free” (generally) approach (although can add liquidity, etc.)

• Consistent valuation of various asset classes (synthetics, cash; ABS, CLO, CDO, CDO^2)

• Sensitivities to various risks and hedge ratios• Computationally intensive• Various level of modelling

– Static (e.g. copula) vs. dynamic

– Top-down vs. bottom-up approaches

– Risks: credit, prepayment, market, liquidity

Example: ABX and ABS CDO

• Pricing ABS CDOs is complex– Each underlying bond may contain thousands of small loans (in essence, CDO^2)

– Cash-flow generation• Cashflow of underlying loans in pool

• Complex CDO waterfall (IR and principal cash-flows, OC, substitution rules, fees, active management, etc.)

• Must model defaults, LGDs) and prepayment - applies different to tranches

• Simplistic valuation as bond with deterministic scheduled amortization – Computed under a single scenario (default, LGD, prepayment, interest rates, spreads)

– Discount spread from comparable trades (matrix pricing)

Collateral cash-flow

engine

CDO waterfall

Defaults

LGD/recoveries

Prepayments

Collateral Cash Flows

Senior trancheMezz trancheJunior tranche Equity tranche

Other factors

Example – ABX

• ABX –referencing 20 Asset Backed CDS (ABCDS) – Home Equity / Sub-prime Bonds

– Five indices: AAA / AA / A / BBB / BBB-

– Trading Began January 2006

• Standard prices and quotes• Modelling issues

– Default risk as well as prepayment risk (competing risks)

– Cash-flow generation• Underlying loans• Bond (and CDS) waterfall

ABX MktPrice ABX-XHAAA72_INDEX 91.81 ABX-XHAA72_INDEX 71.06 ABX-XHA72_INDEX 44.31 ABX-XHBBB72_INDEX 26 ABX-XHBBBM72_INDEX 23

Example – ABX Valuation Model

Simple valuation model (illustration purposes)

• Single systematic factor – drives– Default rates

– Prepayment rates

– Recovery rates

(underlying loans in the pools)

• Large homogeneous portfolio assumption

• Discretization– 133 systematic factor

scenarios0.00%

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PD LGD PP

k kk

Zj Zbtahtp

Example – ABX Valuation under Scenarios

ABX bonds discounted Cashflows (values) under scenarios

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ABX-XHAAA72_INDEX ABX-XHAA72_INDEX ABX-XHA72_INDEX

ABX-XHBBB72_INDEX ABX-XHBBBM72_INDEX

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PD LGD PP


ABX bonds discounted Cashflows (values) under scenarios

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PD LGD PP


Example – ABX Valuation under Scenarios

Example – ABX Valuation and Calibration

Weighted MC implied factor distribution (implied scenario weights)

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PD LGD PP

Example:

• Vasicek PD distribution (Gaussian copula)– Implied avg. PD = 12%– Implied correlation = 7%

$0.00

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ABX-XHAAA72 91.81 103.06 ABX-XHAA72 71.06 94.40 ABX-XHA72 44.31 78.89

ABX-XHBBB72 26 57.19 ABX-XHBBBM72 23 48.47

Market Price Estimated Prices



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PD LGD PP

Example:• Optimized Vasicek PD

distribution

(Gaussian copula)– Implied avg. PD = 16%– Implied correlation 6.5%

$0.00

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ABX-XHAAA72 91.81 102.11 ABX-XHAA72 71.06 74.52 ABX-XHA72 44.31 48.36

ABX-XHBBB72 26 27.81 ABX-XHBBBM72 23 21.78

Market Price Estimated Prices

ABX-XHAAA72_INDEX 91.81 97.66 5.99% ABX-XHAA72_INDEX 71.06 69.91 -1.65% ABX-XHA72_INDEX 44.31 44.69 0.86%

ABX-XHBBB72_INDEX 26 25.84 -0.63% ABX-XHBBBM72_INDEX 23 23.02 0.08%

Market Price Model Prices

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PD LGD PP

Example:• Implied distribution with

closest matching prices• Cannot simultaneously match

the prices of all tranches over this scenarios (model)

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3 ABX-XHAAA72_INDEX 91.81 98.46 7.2% ABX-XHAA72_INDEX 71.06 69.59 -2.1% ABX-XHA72_INDEX 44.31 44.94 1.4%

ABX-XHBBB72_INDEX 26 26.04 0.2% ABX-XHBBBM72_INDEX 23 22.70 -1.3%

7.8%

Market Price Model Price

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ABX-XHAAA72 91.81 101.46 10.5% ABX-XHAA72 71.06 69.07 -2.8% ABX-XHA72 44.31 45.35 2.3%

ABX-XHBBB72 26 27.21 4.7% ABX-XHBBBM72 23 21.70 -5.7%

13.3%

Market Price Model Price

Best fitted prices

Smoothed distribution (non-parametric)

Optimal parametricDistributionPD=16.5 R=7%

ABX-XHAAA72_INDEX 91.81 97.66 5.99% ABX-XHAA72_INDEX 71.06 69.91 -1.65% ABX-XHA72_INDEX 44.31 44.69 0.86%

ABX-XHBBB72_INDEX 26 25.84 -0.63% ABX-XHBBBM72_INDEX 23 23.02 0.08%

Market Price Model Prices

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Five Steps

1. Factor scenarios PD, PP, LGD scenarios for new CDO (factor models)

2. CDO PV scenarios from cash-flow and waterfall engines

3. Valuation using pre-calibrated model

4. Sensitivities and risk measures

5. Model risk assessment

– “Plausible” factor distributions

– PD, PP, LGD model assumptions

– Stress testing and extreme scenarios

Example – Valuing ABS CDO

X0.00%

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PD LGD PP

ABX PD, PP, LGDCDO PD, PP, LGD

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0.80%

1.00%

1.20%

1.40%

1.60%

1.80%

1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93 97 101

105

109

113

117

121

125

129

0.00%

10.00%

20.00%

30.00%

40.00%

50.00%

60.00%

70.00%

80.00%

90.00%

1 6

11

16

21

26

31

36

41

46

51

56

61

66

71

76

81

86

91

96

10

1

10

6

11

1

11

6

12

1

12

6

13

1

PD LGD PP

$0.00

$20.00

$40.00

$60.00

$80.00

$100.00

$120.00

$140.00

$160.00

1 6

11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96

101

106

111

116

121

126

131



$0.00

$20.00

$40.00

$60.00

$80.00

$100.00

$120.00

$140.00

$160.00

1 6

11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96

101

106

111

116

121

126

131



General Scenario Frameworkfor Valuation and Risk Profiling

• Basic idea: set of scenarios where instruments can be consistently valued– Imply “risk-neutral” joint distribution (process) for underlying systematic risk factors

• Observed (liquid) prices (e.g. CDSs, index tranches)

• Prior or “quality” preferences on distribution; subjective views

• Implied factor distributions and weighted MC techniques – Multi-factor credit models

• Consistently characterize concentrations/correlations for different baskets

– Weighted Monte Carlo techniques (used in options pricing)

– CDO analytics and computational techniques

• Value consistently bespoke CDOs, products on multiple indices, structured finance CDOs and CDO-squared

– Characterize and model explicitly the effect concentration/diversification

• Structured finance (ABS, MBS and CDOs)– Flexibly incorporate cash-flow and waterfall engines

– ABS and CLO products – effectively apply prepayment and LGD models

Detailed Asset Modelling and Discrimination

Important to understand underlying pools and model collateral details (bottom-up)- sub-prime vs. prime, vintage, region, etc…

• Important to understand contents and model collateral details

– Scenario vectors with specific loan assumptions

• Key to model concentration risk

– Within a product – impact on valuation and risk

– Across products – portfolio credit risk

• Understand basic components: defaults, LGD, prepayments and

correlations (e.g. ABS tranches)

– Systematic factors

• Risk metrics

– Sensitivities

– Scenarios and stress testing

– Statistical measures (VaR) and risk contributions

Risk Measurement for Structured Finance and CDOs

Risk Measurement for Structured Finance and CDOs

Risk metrics

Product characteristics

NYC-CGU02711-127

High LowLiquidity

Yes NoHedged

High LowStandardization

Pure market risk Pure credit risk

PD/LGDsensitivities

SensitivitiesDV01/CR01

Credit VaR(over 1yr)

StatisticalMarket VaR(over 10 yr)

Jump-to-default/ Downgrade

Discrete/scenarioIR/FX

scenarios

Evolution over ‘07

Correlation Desk CDO Desk

Risk metrics

Product characteristics

NYC-CGU02711-127

High LowLiquidity

Yes NoHedged


Pure market risk Pure credit risk

PD/LGDsensitivities






scenarios


Correlation Desk CDO Desk

NYC-CGU02711-127

High LowLiquidity

Yes NoHedged


Pure market risk Pure credit riskPure market risk Pure credit risk

PD/LGDsensitivities


PD/LGDsensitivities








scenariosJump-to-default/ Downgrade


scenarios


Correlation Desk CDO DeskCorrelation Desk CDO Desk

(over 10 days)

Valuation

Risks

“Correlation-based” models “Bond” models

Remarks: Modeling Structured Credit

• Some drivers in credit markets today – Relatively new asset classes (CDOs, sub-prime MBSs, etc..)– Structures

• Complexity… likely to decrease• Lack of transparency – key issue for the markets to recover!

– Lack of Liquidity and price discovery

• Creation of risks we are ill-equipped to model and manage?• Lack of data and little empirical basis to asses risk• Ability to hedge and manage risk (concentration/diversification)

• Implications for modelling– Valuation, mark-to-market/model: know your collateral

• Understand underlying portfolio and risk

– Interaction of market risk and credit risk in structures

– Concentration risk in credit portfolios– Structure complexity and computational issues– Model risk…

Presenter’s Bio

Dr. Dan Rosen is currently a visiting fellow at the Fields Institute for Research in Mathematical Sciences and an adjunct professor at the University of Toronto‘s Masters program in Mathematical Finance. He is the President of R2 Financial Technologies and acts as an advisor to institutions in Europe, North America, and Latin America on derivatives valuation, risk management, economic and regulatory capital.

Up to July 2005, Dr. Rosen had a successful ten-year career at Algorithmics Inc., where he held senior management roles in strategy and business development, research and financial engineering, and product marketing. In these roles, he was responsible for setting the strategic direction of Algorithmics' solutions, new initiatives and strategic alliances as well as heading up the design, positioning of credit risk and capital management solutions, market risk management tools, operational risk, and advanced simulation and optimization techniques, as well as their application to several industrial settings.

Dr. Rosen lectures extensively around the world on financial engineering, enterprise risk and capital management, credit risk and market risk. He has authored numerous papers on quantitative methods in risk management, applied mathematics, operations research, and has coauthored two books and various chapters in risk management books (including two chapters of PRMIAs Professional Risk Manger Handbook). He is a member of the Oliver Wyman Institute, the Industrial Advisory Board of the Fields Institute, the Academic Advisory Board of Fitch, the Advisory Board and Credit Risk Steering Committee of the IAFE (International Association of Financial Engineers), and the regional director in Toronto of PRMIA (Professional Risk Management International Association). He is also one of the founders of RiskLab, an international network of research centres in Financial Engineering and Risk Management, initiated by the University of Toronto and Algorithmics.

He holds several degrees, including an M.A.Sc. and a Ph.D. in Chemical Engineering from the University of Toronto.

www.R2-financial.com

Documents

Febrero 20, 2008 Integración de Riesgos de Mercado y Crédito Valuacion y Riesgo en Derivados de Credito y Structured Finance (ABS, MBS y CDO) Dan Rosen,