Credit Models and the Crisis: A Journey into CDOs, Copulas, Correlations and Dynamic Models

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Overview

The recent financial crisis has highlighted the need for better valuation models and risk management procedures, better understanding of structured products, and has called into question the actions of many financial institutions. It has become commonplace to blame the inadequacy of credit risk models, claiming that the crisis was due to sophisticated and obscure products being traded, but practitioners have for a long time been aware of the dangers and limitations of credit models. It would seem that a lack of understanding of these models is the root cause of their failures but until now little analysis had been published on the subject and, when published, it had gained very limited attention.

Credit Models and the Crisis is a succinct but technical analysis of the key aspects of the credit derivatives modelling problems, tracing the development (and flaws) of new quantitative methods for credit derivatives and CDOs up to and through the credit crisis. Responding to the immediate need for clarity in the market and academic research environments, this book follows the development of credit derivatives and CDOs at a technical level, analyzing the impact, strengths and weaknesses of methods ranging from the introduction of the Gaussian Copula model and the related implied correlations to the introduction of arbitrage-free dynamic loss models capable of calibrating all the tranches for all the maturities at the same time. It also illustrates the implied copula, a method that can consistently account for CDOs with different attachment and detachment points but not for different maturities, and explains why the Gaussian Copula model is still used in its base correlation formulation.

The book reports both alarming pre-crisis published research and market examples, as well as commentary through history, using data up to the end of 2009, making it an important addition to modern derivatives literature. With banks and regulators struggling to fully analyze at a technical level, many of the flaws in modern financial models, it will be indispensable for quantitative practitioners and academics who want to develop stable and functional models in the future.

Product Details

  • ISBN-13: 9780470665664
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 6/1/2010
  • Edition number: 1
  • Pages: 176
  • Series: Wiley Finance Series , #512
  • Product dimensions: 6.00 (w) x 8.90 (h) x 0.80 (d)

Meet the Author

DAMIANO BRIGO is Managing Director and Global Head of the Quantitative team in Fitch Solutions, and Visiting Professor at the Department of Mathematics at Imperial College, London.
Damiano has published more than 50 articles in top journals for mathematical finance, systems theory, probability and statistics, and a book for Springer Verlag that has become a field reference in stochastic interest rate modeling. Damiano is Managing Editor of the International Journal of Theoretical and Applied Finance, he is a member of the Fitch Academic Advisory Board and is part of scientific committees for academic conference occurring at MIT and other academic and industry institutions. Damiano has also been a charter member of Risk's Who's Who since 2007.
Damiano's interests include pricing, risk measurement, credit and default modeling, counterparty risk, and stochastic dynamical models for commodities and inflation.
Damiano obtained a Ph.D. in stochastic filtering with differential geometry in 1996 from the Free University of Amsterdam, following a BSc in Mathematics with honours from the University of Padua.

ANDREA PALLAVICINI is Head of Financial Engineering at Banca Leonardo in Milan. Previously, he worked as Head of Equity and Hybrid Models in Banca IMI, working also on dynamical loss models, interest-rate derivatives, smile modelling and counterparty risk.
Over the years he has published several academic and practitioner-oriented articles in financial modeling, theoretical physics and astrophysics. He has taught Master courses in finance at the Universities of Pavia and Milan.
He obtained a Degree in astrophysics, and a Ph.D. in theoretical and mathematical physics from the University of Pavia.

ROBERTO TORRESETTI is responsible for Structured Credit Derivatives at BBVA. He was previously a senior credit derivatives modeller at Banca IMI and equity derivatives analyst at Lehman Brothers and a quantitative fund manager at San Paolo IMI Asset Management. He holds a bachelor's degree in economics from Università Bocconi in Milan and completed his MA in economics at Università Bocconi and MS in financial mathematics at the University of Chicago.

Table of Contents

Preface ix

Acknowledgements xxi

About the Authors xxiii

Notation and List of Symbols xxv

1 Introduction: Credit Modelling Pre- and In-Crisis 1

1.1 Bottom-up models 2

1.2 Compound correlation 4

1.3 Base correlation 4

1.4 Implied Copula 5

1.5 Expected Tranche Loss Surface 7

1.6 Top (down) framework 8

1.7 GPL and GPCL models 9

1.8 Structure of the book 12

2 Market Quotes 15

2.1 Credit indices 15

2.2 CDO tranches 17

3 Gaussian Copula Model and Implied Correlation 21

3.1 One-factor Gaussian Copula model 24

3.1.1 Finite pool homogeneous one-factor Gaussian Copula model 25

3.1.2 Finite pool heterogeneous one-factor Gaussian Copula model 27

3.1.3 Large pool homogeneous one-factor Gaussian Copula model 29

3.2 Double-t Copula Model 33

3.3 Compound correlation and base correlation 35

3.4 Existence and non-monotonicity of market spread as a function of compound correlation 37

3.5 Invertibility limitations of compound correlation: pre-crisis 39

3.6 Base correlation 39

3.7 Is base correlation a solution to the problems of compound correlation? 42

3.8 Can the Double-t Copula flatten the Gaussian base correlation skew? 45

3.9 Summary on implied correlation 45

4 Consistency across Capital Structure: Implied Copula 47

4.1 Calibration of Implied Copula 50

4.2 Two-stage regularization 54

4.3 Summary of considerations around Implied Copula 59

5 Consistency across Capital Structure and Maturities: Expected Tranche Loss 63

5.1 Index and tranche NPV as a function of ETL 65

5.2 Numerical results 71

5.3 Summary on Expected (Equity) Tranche Loss 72

6 A Fully Consistent Dynamical Model: Generalized-Poisson Loss Model 75

6.1 Loss dynamics 76

6.2 Model limits 78

6.3 Model calibration 78

6.4 Detailed calibration procedure 79

6.5 Calibration results 80

7 Application to More Recent Data and the Crisis 87

7.1 Compound correlation in-crisis 87

7.2 Base correlation in-crisis 99

7.3 Implied Copula in-crisis 105

7.4 Expected Tranche Loss surface in-crisis 106

7.4.1 Deterministic piecewise constant recovery rates 111

7.5 Generalized-Poisson Loss model in-crisis 115

8 Final Discussion and Conclussion 125

8.1 There are more things in heaven and earth, Horatio . . . 125

8.2 . . . Than are dreamt of in your philosophy 127

Bibliography 131

Index 137

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