Risk management and shareholders' value in banking: from risk measurement models to capital allocation policies
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Hoboken, NJ [u.a.]
Wiley
2007
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| Schlagworte: | |
| Online-Zugang: | Table of contents only Inhaltsverzeichnis |
| Beschreibung: | Includes bibliographical references and index |
| Beschreibung: | XXV, 782 S. graf. Darst. |
| ISBN: | 9780470029787 |
Internformat
MARC
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| 245 | 1 | 0 | |a Risk management and shareholders' value in banking |b from risk measurement models to capital allocation policies |c Andrea Sironi and Andrea Resti |
| 264 | 1 | |a Hoboken, NJ [u.a.] |b Wiley |c 2007 | |
| 300 | |a XXV, 782 S. |b graf. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
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| 500 | |a Includes bibliographical references and index | ||
| 650 | 4 | |a Bank | |
| 650 | 4 | |a Asset-liability management | |
| 650 | 4 | |a Bank management | |
| 650 | 4 | |a Banks and banking |x Valuation | |
| 650 | 4 | |a Financial institutions |x Valuation | |
| 650 | 4 | |a Risk management | |
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Datensatz im Suchindex
| _version_ | 1804136651120705536 |
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| adam_text | Contents
Foreword xix
Motivation and Scope of this Book: A Quick Guided Tour xxi
PART I INTEREST RATE RISK 1
Introduction to Part I 3
1 The Repricing Gap Model 9
1.1 Introduction 9
1.2 The gap concept 9
1.3 The maturity adjusted gap 12
1.4 Marginal and cumulative gaps 15
1.5 The limitations of the repricing gap model 19
1.6 Some possible solutions 20
1.6.1 Non uniform rate changes: the standardized gap 20
1.6.2 Changes in rates of on demand instruments 23
1.6.3 Price and quantity interaction 24
1.6.4 Effects on the value of assets and liabilities 25
Selected Questions and Exercises 25
Appendix 1A The Term Structure of Interest Rates 28
Appendix IB Forward Rates 32
2 The Duration Gap Model 35
2.1 Introduction 35
2.2 Towards mark to market accounting 35
2.3 The duration of financial instruments 39
2.3.1 Duration as a weighted average of maturities 39
2.3.2 Duration as an indicator of sensitivity to interest rates
changes 40
2.3.3 The properties of duration 42
2.4 Estimating the duration gap 42
2.5 Problems of the duration gap model 45
Selected Questions and Exercises 47
Appendix 2A The Limits of Duration 49
viii Contents
3 Models Based on Cash Flow Mapping 57
3.1 Introduction 57
3.2 The objectives of cash flow mapping and term structure 57
3.3 Choosing the vertices of the term structure 58
3.4 Techniques based on discrete intervals 59
3.4.1 The duration intervals method 59
3.4.2 The modified residual life method 60
3.4.3 The Basel Committee Method 61
3.5 Clumping 64
3.5.1 Structure of the methodology 64
3.5.2 An example 65
3.5.3 Clumping on the basis of price volatility 67
3.6 Concluding comments 68
Selected Questions and Exercises 69
Appendix 3A Estimating the Zero Coupon Curve 71
4 Internal Transfer Rates 77
4.1 Introduction 77
4.2 Building an ITR system: a simplified example 77
4.3 Single and multiple ITRs 79
4.4 Setting internal interest transfer rates 84
4.4.1 ITRs for fixed rate transactions 84
4.4.2 ITRs for floating rate transactions 85
4.4.3 ITRs for transactions indexed at non market rates 85
4.5 ITRs for transactions with embedded options 88
4.5.1 Option to convert from fixed to floating rate 88
4.5.2 Floating rate loan subject to a cap 89
4.5.3 Floating rate loan subject to a floor 90
4.5.4 Floating rate loan subject to both a floor and a cap 91
4.5.5 Option for early repayment 91
4.6 Summary: the ideal features of an ITR system 93
Selected Questions and Exercises 94
Appendix 4A Derivative Contracts on Interest Rates 96
PART II MARKET RISKS 103
Introduction to Part II 105
5 The Variance Covariance Approach 115
5.1 Introduction 115
5.2 VaR derivation assuming normal return distribution 115
5.2.1 A simplified example 115
5.2.2 Confidence level selection 121
5.2.3 Selection of the time horizon 124
5.3 Sensitivity of portfolio positions to market factors 126
5.3.1 A more general example 126
Contents ix
5.3.2 Portfolio VaR 128
5.3.3 Delta normal and asset normal approaches 132
5.4 Mapping of risk positions 133
5.4.1 Mapping of foreign currency bonds 133
5.4.2 Mapping of forward currency positions 135
5.4.3 Mapping of forward rate agreements 139
5.4.4 Mapping of stock positions 140
5.4.5 Mapping of bonds 143
5.5 Summary of the variance covariance approach and main limitations 143
5.5.1 The normal distribution hypothesis 144
5.5.2 Serial independence and stability of the variance
covariance matrix 147
5.5.3 The linear payoff hypothesis and the delta/gamma
approach 148
Selected Questions and Exercises 151
Appendix 5A Stockmarket Betas 154
Appendix 5B Option Sensitivity Coefficients: Greeks 157
6 Volatility Estimation Models 163
6.1 Introduction 163
6.2 Volatility estimation based upon historical data: simple moving
averages 163
6.3 Volatility estimation based upon historical data: exponential moving
averages 167
6.4 Volatility prediction: GARCH models 172
6.5 Volatility prediction: implied volatility 179
6.6 Covariance and correlation estimation 181
Selected Questions and Exercises 182
7 Simulation Models 185
7.1 Introduction 185
7.2 Historical simulations 189
7.2.1 A first example: the VaR of a single position 189
7.2.2 Estimation of a portfolio s VaR 193
7.2.3 A comparison between historical simulations and the
variance covariance approach 195
7.2.4 Merits and limitations of the historical simulation method 196
7.2.5 The hybrid approach 198
7.2.6 Bootstrapping and path generation 201
7.2.7 Filtered historical simulations 202
7.3 Monte Carlo simulations 205
7.3.1 Estimating the VaR of a single position 207
7.3.2 Estimating portfolio VaR 209
7.3.3 Merits and limitations of Monte Carlo simulations 214
7.4 Stress testing 218
Selected Questions and Exercises 221
x Contents
8 Evaluating VaR Models 225
8.1 Introduction 225
8.2 An example of backtesting: a stock portfolio VaR 225
8.3 Alternative VaR model backtesting techniques 232
8.3.1 The unconditional coverage test 233
8.3.2 The conditional coverage test 238
8.3.3 The Lopez test based upon a loss function 241
8.3.4 Tests based upon the entire distribution 243
Selected Questions and Exercises 244
Appendix 8A VaR Model Backtesting According to the Basel
Committee 246
9 VaR Models: Summary, Applications and Limitations 251
9.1 Introduction 251
9.2 A summary overview of the different models 251
9.3 Applications of VaR models 253
9.3.1 Comparison among different risks 253
9.3.2 Determination of risk taking limits 257
9.3.3 The construction of risk adjusted performance (RAP)
measures 258
9.4 Six False Shortcomings of VaR 260
9.4.1 VaR models disregard exceptional events 260
9.4.2 VaR models disregard customer relations 261
9.4.3 VaR models are based upon unrealistic assumptions 261
9.4.4 VaR models generate diverging results 262
9.4.5 VaR models amplify market instability 262
9.4.6 VaR measures come too late, when damage has already
been done 263
9.5 Two real problems of VaR models 263
9.5.1 The Size of Losses 263
9.5.2 Non subadditivity 265
9.6 An Alternative Risk Measure: Expected Shortfall (ES) 268
Selected Questions and Exercises 269
Appendix 9A Extreme Value Theory 272
PART III CREDIT RISK 275
Introduction to Part III 277
10 Credit Scoring Models 287
10.1 Introduction 287
10.2 Linear discriminant analysis 287
10.2.1 The discriminant function 287
10.2.2 Wilks Lambda 292
10.2.3 Altman s Z score 294
10.2.4 From the score to the probability of default 295
Contents xi
10.2.5 The cost of errors 296
10.2.6 The selection of discriminant variables 297
10.2.7 Some hypotheses underlying discriminant analysis 299
10.3 Regression models 299
10.3.1 The linear probabilistic model 299
10.3.2 The logit and probit models 301
10.4 Inductive models 301
10.4.1 Neural networks 301
10.4.2 Genetic algorithms 304
10.5 Uses, limitations and problems of credit scoring models 307
Selected Questions and Exercises 309
Appendix 10A The Estimation of the Gamma Coefficients in Linear
Discriminant Analysis 311
11 Capital Market Models 313
11.1 Introduction 313
11.2 The approach based on corporate bond spreads 313
11.2.1 Foreword: continuously compounded interest rates 314
11.2.2 Estimating the one year probability of default 314
11.2.3 Probabilities of default beyond one year 315
11.2.4 An alternative approach 318
11.2.5 Benefits and limitations of the approach based on corporate
bond spreads 320
11.3 Structural models based on stock prices 321
11.3.1 An introduction to structural models 321
11.3.2 Merton s model: general structure 322
11.3.3 Merton s model: the role of contingent claims analysis 324
11.3.4 Merton s model: loan value and equilibrium spread 326
11.3.5 Merton s model: probability of default 328
11.3.6 The term structure of credit spreads and default probabilities 328
11.3.7 Strengths and limitations of Merton s model 330
11.3.8 The KMV model for calculating Vo and av 332
11.3.9 The KMV approach and the calculation of PD 334
11.3.10 Benefits and limitations of the KMV model 337
Selected Questions and Exercises 340
Appendix 11A Calculating the Fair Spread on a Loan 342
Appendix 1 IB Real and Risk Neutral Probabilities of Default 343
12 LGD and Recovery Risk 345
12.1 Introduction 345
12.2 What factors drive recovery rates? 346
12.3 The estimation of recovery rates 347
12.3.1 Market LGD and Default LGD 347
12.3.2 Computing workout LGDs 348
12.4 From past data to LGD estimates 351
12.5 Results from selected empirical studies 353
xii Contents
12.6 Recovery risk 356
12.7 The link between default risk and recovery risk 358
Selected Questions and Exercises 362
Appendix 12A The Relationship between PD and RR in the Merton
model 364
13 Rating Systems 369
13.1 Introduction 369
13.2 Rating assignment 370
13.2.1 Internal ratings and agency ratings: how do they differ? 370
13.2.2 The assignment of agency ratings 372
13.2.3 Rating assessment in bank internal rating systems 376
13.3 Rating quantification 379
13.3.1 The possible approaches 379
13.3.2 The actuarial approach: marginal, cumulative and annualized
default rates 380
13.3.3 The actuarial approach: migration rates 386
13.4 Rating validation 388
13.4.1 Some qualitative criteria 388
13.4.2 Quantitative criteria for validating rating assignments 389
13.4.3 The validation of the rating quantification step 396
Selected Questions and Exercises 398
14 Portfolio Models 401
14.1 Introduction 401
14.2 Selecting time horizon and confidence level 402
14.2.1 The choice of the risk horizon 402
14.2.2 The choice of the confidence level 405
14.3 The migration approach: CreditMetrics™ 406
14.3.1 Estimating risk on a single credit exposure 407
14.3.2 Estimating the risk of a two exposure portfolio 412
14.3.3 Estimating asset correlation 418
14.3.4 Application to a portfolio of N positions 420
14.3.5 Merits and limitations of the CreditMetrics™ model 422
14.4 The structural approach: PortfolioManager™ 423
14.5 The macroeconomic approach: CreditPortfolioView™ 426
14.5.1 Estimating conditional default probabilities 426
14.5.2 Estimating the conditional transition matrix 427
14.5.3 Merits and limitations of CreditPortfolioView™ 428
14.6 The actuarial approach: CreditRisk+™ 428
14.6.1 Estimating the probability distribution of defaults 429
14.6.2 The probability distribution of losses 430
14.6.3 The distribution of losses of the entire portfolio 432
14.6.4 Uncertainty about the average default rate and correlations 434
14.6.5 Merits and limitations of CreditRisk+™ 438
14.7 A brief comparison of the main models 439
Contents xiii
14.8 Some limitations of the credit risk models 442
14.8.1 The treatment of recovery risk 443
14.8.2 The assumption of independence between exposure risk and
default risk 443
14.8.3 The assumption of independence between credit risk and
market risk 444
14.8.4 The impossibility of backtesting 444
Selected Questions and Exercises 446
Appendix 14A Asset correlation versus default correlation 449
15 Some Applications of Credit Risk Measurement Models 451
15.1 Introduction 451
15.2 Loan pricing 451
15.2.1 The cost of the expected loss 452
15.2.2 The cost of economic capital absorbed by unexpected losses 453
15.3 Risk adjusted performance measurement 457
15.4 Setting limits on risk taking units 459
15.5 Optimizing the composition of the loan portfolio 461
Selected Questions and Exercises 462
Appendix 15A Credit Risk Transfer Tools 464
16 Counterparty Risk on OTC Derivatives 473
16.1 Introduction 473
16.2 Settlement and pre settlement risk 474
16.3 Estimating pre settlement risk 474
16.3.1 Two approaches suggested by the Basel Committee (1988) 475
16.3.2 A more sophisticated approach 477
16.3.3 Estimating the loan equivalent exposure of an interest rate
swap 479
16.3.4 Amortization and diffusion effect 484
16.3.5 Peak exposure (PE) and average expected exposure (AEE) 489
16.3.6 Further approaches to LEE computation 493
16.3.7 Loan equivalent and Value at Risk: analogies and differences 494
16.4 Risk adjusted performance measurement 495
16.5 Risk mitigation tools for pre settlement risk 496
16.5.1 Bilateral netting agreements 496
16.5.2 Safety margins 500
16.5.3 Recouponing and guarantees 501
16.5.4 Credit triggers and early redemption options 501
Selected Questions and Exercises 504
PART IV OPERATIONAL RISK 505
Introduction to Part IV 507
17 Operational Risk: Definition, Measurement and Management 511
17.1 Introduction 511
xiv Contents
17.2 OR: How can we define it? 512
17.2.1 OR risk factors 512
17.2.2 Some peculiarities of OR 514
17.3 Measuring OR 517
17.3.1 Identifying the risk factors 518
17.3.2 Mapping business units and estimating risk exposure 518
17.3.3 Estimating the probability of the risky events 519
17.3.4 Estimating the losses 522
17.3.5 Estimating expected loss 524
17.3.6 Estimating unexpected loss 527
17.3.7 Estimating Capital at Risk against OR 529
17.4 Towards an OR management system 533
17.5 Final remarks 535
Selected Questions and Exercises 537
Appendix 17A OR measurement and EVT 539
PART V REGULATORY CAPITAL REQUIREMENTS 543
Introduction to Part V 545
18 The 1988 Capital Accord 547
18.1 Introduction 547
18.2 The capital ratio 549
18.2.1 Regulatory capital (RC) 549
18.2.1.1 Tier 1 capital 549
18.2.1.2 Supplementary capital (Tier 2 and Tier 3) 552
18.2.2 Risk weights (w, ) 554
18.2.3 Assets included in the capital ratio (A,) 555
18.3 Shortcomings of the capital adequacy framework 555
18.3.1 Focus on credit risk only 556
18.3.2 Poor differentiation of risk 556
18.3.3 Limited recognition of the link between maturity and credit
risk 556
18.3.4 Disregard for portfolio diversification 556
18.3.5 Limited recognition of risk mitigation tools 559
18.3.6 Regulatory arbitrage 559
18.4 Conclusions 559
Selected Questions and Exercises 559
Appendix 18A The Basel Committee 563
19 The Capital Requirements for Market Risks 565
19.1 Introduction 565
19.2 Origins and characteristics of capital requirements 565
19.2.1 Origins of the requirements 565
19.2.2 Logic and scope of application 566
19.2.3 The building blocks approach 567
Contents xv
19.2.4 Tier 3 Capital 568
19.3 The capital requirement on debt securities 568
19.3.1 The requirement for specific risk 568
19.3.2 The requirement for generic risk 569
19.4 Positions in equity securities: specific and generic requirements 575
19.5 The requirement for positions in foreign currencies 576
19.6 The requirement for commodity positions 578
19.7 The use of internal models 578
19.7.1 Criticism of the Basel Committee proposals 578
19.7.2 The 1995 revised draft 579
19.7.3 The final amendment of January 1996 581
19.7.4 Advantages and limitations of the internal model approach 582
19.7.5 The pre commitment approach 583
Selected Questions and Exercises 585
Appendix 19A Capital Requirements Related to Settlement,
Counterparty and Concentration Risks 588
20 The New Basel Accord 591
20.1 Introduction 591
20.2 Goals and Contents of the Reform 591
20.3 Pillar One: The Standard Approach to Credit Risk 593
20.3.1 Risk Weighting 593
20.3.2 Collateral and Guarantees 596
20.4 The Internal Ratings based Approach 597
20.4.1 Risk Factors 597
20.4.2 Minimum Requirements of the Internal Ratings System 600
20.4.3 From the Rating System to the Minimum Capital
Requirements 603
20.5 Pillar Two: A New Role for Supervisory Authorities 612
20.6 Pillar Three: Market Discipline 614
20.6.1 The Rationale Underlying Market Discipline 614
20.6.2 The Reporting Obligations 614
20.6.3 Other Necessary Conditions for Market Discipline 615
20.7 Pros and Cons of Basel II 616
20.8 The Impact of Basel II 619
20.8.1 The Impact on First Implementation 619
20.8.2 The Dynamic Impact: Procyclicality 623
Selected Questions and Exercises 630
21 Capital Requirements on Operational Risk 633
21.1 Introduction 633
21.2 The capital requirement on operational risk 633
21.2.1 The Basic Indicator Approach 634
21.2.2 The Standardized Approach 635
21.2.3 The requirements for adopting the standardized approach 638
21.2.4 Advanced measurement approaches 638
xvi Contents
21.2.5 The requirements for adopting advanced approaches 639
21.2.6 The role of the second and third pillars 644
21.2.7 The role of insurance coverage 644
21.3 Weaknesses of the 2004 Accord 645
21.4 Final remarks 647
Selected Questions and Exercises 647
PART VI CAPITAL MANAGEMENT AND VALUE CREATION 651
Introduction to Part VI 653
22 Capital Management 657
22.1 Introduction 657
22.2 Defining and measuring capital 658
22.2.1 The definition of capital 658
22.2.2 The relationship between economic capital and available
capital 661
22.2.3 Calculating a bank s economic capital 663
22.2.4 The relationship between economic capital and regulatory
capital 667
22.2.5 The constraints imposed by regulatory capital: implications
on pricing and performance measurement 671
22.2.6 The determinants of capitalization 674
22.3 Optimizing regulatory capital 675
22.3.1 Technical features of the different regulatory capital
instruments 676
22.3.2 The actual use of the various instruments included within
regulatory capital 680
22.4 Other instruments not included within regulatory capital 685
22.4.1 Insurance capital 685
22.4.2 Contingent capital 687
Selected Questions and Exercises 691
23 Capital Allocation 693
23.1 Introduction 693
23.2 Measuring capital for the individual business units 694
23.2.1 The benchmark capital approach 695
23.2.2 The model based approach 695
23.2.3 The Earnings at Risk (EaR) approach 697
23.3 The relationship between allocated capital and total capital 702
23.3.1 The concept of diversified capital 702
23.3.2 Calculating diversified capital 703
23.3.3 Calculating the correlations used in determining diversified
capital 710
23.4 Capital allocated and capital absorbed 712
23.5 Calculating risk adjusted performance 715
Contents xvii
23.6 Optimizing the allocation of capital 722
23.6.1 A model for optimal capital allocation 722
23.6.2 A more realistic model 724
23.7 The organizational aspects of the capital allocation process 726
Selected Questions and Exercises 728
Appendix 23A The Correlation Approach 730
Appendix 23B The Virtual Nature of Capital Allocation 731
24 Cost of Capital and Value Creation 735
24.1 Introduction 735
24.2 The link between Risk Management and Capital Budgeting 735
24.3 Capital Budgeting in Banks and in Non Financial Enterprises 736
24.4 Estimating the Cost of Capital 739
24.4.1 The method based on the dividend discount model 739
24.4.2 The method based on the price/earnings ratio 741
24.4.3 The method based on the Capital Asset Pricing Model
(CAPM) 742
24.4.4 Caveats 744
24.5 Some empirical Examples 745
24.6 Value Creation and RAROC 750
24.7 Value Creation and EVA 753
24.8 Conclusions 756
Selected Questions and Exercises 757
Bibliography 759
Index 771
|
| adam_txt |
Contents
Foreword xix
Motivation and Scope of this Book: A Quick Guided Tour xxi
PART I INTEREST RATE RISK 1
Introduction to Part I 3
1 The Repricing Gap Model 9
1.1 Introduction 9
1.2 The gap concept 9
1.3 The maturity adjusted gap 12
1.4 Marginal and cumulative gaps 15
1.5 The limitations of the repricing gap model 19
1.6 Some possible solutions 20
1.6.1 Non uniform rate changes: the standardized gap 20
1.6.2 Changes in rates of on demand instruments 23
1.6.3 Price and quantity interaction 24
1.6.4 Effects on the value of assets and liabilities 25
Selected Questions and Exercises 25
Appendix 1A The Term Structure of Interest Rates 28
Appendix IB Forward Rates 32
2 The Duration Gap Model 35
2.1 Introduction 35
2.2 Towards mark to market accounting 35
2.3 The duration of financial instruments 39
2.3.1 Duration as a weighted average of maturities 39
2.3.2 Duration as an indicator of sensitivity to interest rates
changes 40
2.3.3 The properties of duration 42
2.4 Estimating the duration gap 42
2.5 Problems of the duration gap model 45
Selected Questions and Exercises 47
Appendix 2A The Limits of Duration 49
viii Contents
3 Models Based on Cash Flow Mapping 57
3.1 Introduction 57
3.2 The objectives of cash flow mapping and term structure 57
3.3 Choosing the vertices of the term structure 58
3.4 Techniques based on discrete intervals 59
3.4.1 The duration intervals method 59
3.4.2 The modified residual life method 60
3.4.3 The Basel Committee Method 61
3.5 Clumping 64
3.5.1 Structure of the methodology 64
3.5.2 An example 65
3.5.3 Clumping on the basis of price volatility 67
3.6 Concluding comments 68
Selected Questions and Exercises 69
Appendix 3A Estimating the Zero Coupon Curve 71
4 Internal Transfer Rates 77
4.1 Introduction 77
4.2 Building an ITR system: a simplified example 77
4.3 Single and multiple ITRs 79
4.4 Setting internal interest transfer rates 84
4.4.1 ITRs for fixed rate transactions 84
4.4.2 ITRs for floating rate transactions 85
4.4.3 ITRs for transactions indexed at "non market" rates 85
4.5 ITRs for transactions with embedded options 88
4.5.1 Option to convert from fixed to floating rate 88
4.5.2 Floating rate loan subject to a cap 89
4.5.3 Floating rate loan subject to a floor 90
4.5.4 Floating rate loan subject to both a floor and a cap 91
4.5.5 Option for early repayment 91
4.6 Summary: the ideal features of an ITR system 93
Selected Questions and Exercises 94
Appendix 4A Derivative Contracts on Interest Rates 96
PART II MARKET RISKS 103
Introduction to Part II 105
5 The Variance Covariance Approach 115
5.1 Introduction 115
5.2 VaR derivation assuming normal return distribution 115
5.2.1 A simplified example 115
5.2.2 Confidence level selection 121
5.2.3 Selection of the time horizon 124
5.3 Sensitivity of portfolio positions to market factors 126
5.3.1 A more general example 126
Contents ix
5.3.2 Portfolio VaR 128
5.3.3 Delta normal and asset normal approaches 132
5.4 Mapping of risk positions 133
5.4.1 Mapping of foreign currency bonds 133
5.4.2 Mapping of forward currency positions 135
5.4.3 Mapping of forward rate agreements 139
5.4.4 Mapping of stock positions 140
5.4.5 Mapping of bonds 143
5.5 Summary of the variance covariance approach and main limitations 143
5.5.1 The normal distribution hypothesis 144
5.5.2 Serial independence and stability of the variance
covariance matrix 147
5.5.3 The linear payoff hypothesis and the delta/gamma
approach 148
Selected Questions and Exercises 151
Appendix 5A Stockmarket Betas 154
Appendix 5B Option Sensitivity Coefficients: "Greeks" 157
6 Volatility Estimation Models 163
6.1 Introduction 163
6.2 Volatility estimation based upon historical data: simple moving
averages 163
6.3 Volatility estimation based upon historical data: exponential moving
averages 167
6.4 Volatility prediction: GARCH models 172
6.5 Volatility prediction: implied volatility 179
6.6 Covariance and correlation estimation 181
Selected Questions and Exercises 182
7 Simulation Models 185
7.1 Introduction 185
7.2 Historical simulations 189
7.2.1 A first example: the VaR of a single position 189
7.2.2 Estimation of a portfolio's VaR 193
7.2.3 A comparison between historical simulations and the
variance covariance approach 195
7.2.4 Merits and limitations of the historical simulation method 196
7.2.5 The hybrid approach 198
7.2.6 Bootstrapping and path generation 201
7.2.7 Filtered historical simulations 202
7.3 Monte Carlo simulations 205
7.3.1 Estimating the VaR of a single position 207
7.3.2 Estimating portfolio VaR 209
7.3.3 Merits and limitations of Monte Carlo simulations 214
7.4 Stress testing 218
Selected Questions and Exercises 221
x Contents
8 Evaluating VaR Models 225
8.1 Introduction 225
8.2 An example of backtesting: a stock portfolio VaR 225
8.3 Alternative VaR model backtesting techniques 232
8.3.1 The unconditional coverage test 233
8.3.2 The conditional coverage test 238
8.3.3 The Lopez test based upon a loss function 241
8.3.4 Tests based upon the entire distribution 243
Selected Questions and Exercises 244
Appendix 8A VaR Model Backtesting According to the Basel
Committee 246
9 VaR Models: Summary, Applications and Limitations 251
9.1 Introduction 251
9.2 A summary overview of the different models 251
9.3 Applications of VaR models 253
9.3.1 Comparison among different risks 253
9.3.2 Determination of risk taking limits 257
9.3.3 The construction of risk adjusted performance (RAP)
measures 258
9.4 Six "False Shortcomings" of VaR 260
9.4.1 VaR models disregard exceptional events 260
9.4.2 VaR models disregard customer relations 261
9.4.3 VaR models are based upon unrealistic assumptions 261
9.4.4 VaR models generate diverging results 262
9.4.5 VaR models amplify market instability 262
9.4.6 VaR measures "come too late, when damage has already
been done" 263
9.5 Two real problems of VaR models 263
9.5.1 The Size of Losses 263
9.5.2 Non subadditivity 265
9.6 An Alternative Risk Measure: Expected Shortfall (ES) 268
Selected Questions and Exercises 269
Appendix 9A Extreme Value Theory 272
PART III CREDIT RISK 275
Introduction to Part III 277
10 Credit Scoring Models 287
10.1 Introduction 287
10.2 Linear discriminant analysis 287
10.2.1 The discriminant function 287
10.2.2 Wilks' Lambda 292
10.2.3 Altman's Z score 294
10.2.4 From the score to the probability of default 295
Contents xi
10.2.5 The cost of errors 296
10.2.6 The selection of discriminant variables 297
10.2.7 Some hypotheses underlying discriminant analysis 299
10.3 Regression models 299
10.3.1 The linear probabilistic model 299
10.3.2 The logit and probit models 301
10.4 Inductive models 301
10.4.1 Neural networks 301
10.4.2 Genetic algorithms 304
10.5 Uses, limitations and problems of credit scoring models 307
Selected Questions and Exercises 309
Appendix 10A The Estimation of the Gamma Coefficients in Linear
Discriminant Analysis 311
11 Capital Market Models 313
11.1 Introduction 313
11.2 The approach based on corporate bond spreads 313
11.2.1 Foreword: continuously compounded interest rates 314
11.2.2 Estimating the one year probability of default 314
11.2.3 Probabilities of default beyond one year 315
11.2.4 An alternative approach 318
11.2.5 Benefits and limitations of the approach based on corporate
bond spreads 320
11.3 Structural models based on stock prices 321
11.3.1 An introduction to structural models 321
11.3.2 Merton's model: general structure 322
11.3.3 Merton's model: the role of contingent claims analysis 324
11.3.4 Merton's model: loan value and equilibrium spread 326
11.3.5 Merton's model: probability of default 328
11.3.6 The term structure of credit spreads and default probabilities 328
11.3.7 Strengths and limitations of Merton's model 330
11.3.8 The KMV model for calculating Vo and av 332
11.3.9 The KMV approach and the calculation of PD 334
11.3.10 Benefits and limitations of the KMV model 337
Selected Questions and Exercises 340
Appendix 11A Calculating the Fair Spread on a Loan 342
Appendix 1 IB Real and Risk Neutral Probabilities of Default 343
12 LGD and Recovery Risk 345
12.1 Introduction 345
12.2 What factors drive recovery rates? 346
12.3 The estimation of recovery rates 347
12.3.1 Market LGD and Default LGD 347
12.3.2 Computing workout LGDs 348
12.4 From past data to LGD estimates 351
12.5 Results from selected empirical studies 353
xii Contents
12.6 Recovery risk 356
12.7 The link between default risk and recovery risk 358
Selected Questions and Exercises 362
Appendix 12A The Relationship between PD and RR in the Merton
model 364
13 Rating Systems 369
13.1 Introduction 369
13.2 Rating assignment 370
13.2.1 Internal ratings and agency ratings: how do they differ? 370
13.2.2 The assignment of agency ratings 372
13.2.3 Rating assessment in bank internal rating systems 376
13.3 Rating quantification 379
13.3.1 The possible approaches 379
13.3.2 The actuarial approach: marginal, cumulative and annualized
default rates 380
13.3.3 The actuarial approach: migration rates 386
13.4 Rating validation 388
13.4.1 Some qualitative criteria 388
13.4.2 Quantitative criteria for validating rating assignments 389
13.4.3 The validation of the rating quantification step 396
Selected Questions and Exercises 398
14 Portfolio Models 401
14.1 Introduction 401
14.2 Selecting time horizon and confidence level 402
14.2.1 The choice of the risk horizon 402
14.2.2 The choice of the confidence level 405
14.3 The migration approach: CreditMetrics™ 406
14.3.1 Estimating risk on a single credit exposure 407
14.3.2 Estimating the risk of a two exposure portfolio 412
14.3.3 Estimating asset correlation 418
14.3.4 Application to a portfolio of N positions 420
14.3.5 Merits and limitations of the CreditMetrics™ model 422
14.4 The structural approach: PortfolioManager™ 423
14.5 The macroeconomic approach: CreditPortfolioView™ 426
14.5.1 Estimating conditional default probabilities 426
14.5.2 Estimating the conditional transition matrix 427
14.5.3 Merits and limitations of CreditPortfolioView™ 428
14.6 The actuarial approach: CreditRisk+™ 428
14.6.1 Estimating the probability distribution of defaults 429
14.6.2 The probability distribution of losses 430
14.6.3 The distribution of losses of the entire portfolio 432
14.6.4 Uncertainty about the average default rate and correlations 434
14.6.5 Merits and limitations of CreditRisk+™ 438
14.7 A brief comparison of the main models 439
Contents xiii
14.8 Some limitations of the credit risk models 442
14.8.1 The treatment of recovery risk 443
14.8.2 The assumption of independence between exposure risk and
default risk 443
14.8.3 The assumption of independence between credit risk and
market risk 444
14.8.4 The impossibility of backtesting 444
Selected Questions and Exercises 446
Appendix 14A Asset correlation versus default correlation 449
15 Some Applications of Credit Risk Measurement Models 451
15.1 Introduction 451
15.2 Loan pricing 451
15.2.1 The cost of the expected loss 452
15.2.2 The cost of economic capital absorbed by unexpected losses 453
15.3 Risk adjusted performance measurement 457
15.4 Setting limits on risk taking units 459
15.5 Optimizing the composition of the loan portfolio 461
Selected Questions and Exercises 462
Appendix 15A Credit Risk Transfer Tools 464
16 Counterparty Risk on OTC Derivatives 473
16.1 Introduction 473
16.2 Settlement and pre settlement risk 474
16.3 Estimating pre settlement risk 474
16.3.1 Two approaches suggested by the Basel Committee (1988) 475
16.3.2 A more sophisticated approach 477
16.3.3 Estimating the loan equivalent exposure of an interest rate
swap 479
16.3.4 Amortization and diffusion effect 484
16.3.5 Peak exposure (PE) and average expected exposure (AEE) 489
16.3.6 Further approaches to LEE computation 493
16.3.7 Loan equivalent and Value at Risk: analogies and differences 494
16.4 Risk adjusted performance measurement 495
16.5 Risk mitigation tools for pre settlement risk 496
16.5.1 Bilateral netting agreements 496
16.5.2 Safety margins 500
16.5.3 Recouponing and guarantees 501
16.5.4 Credit triggers and early redemption options 501
Selected Questions and Exercises 504
PART IV OPERATIONAL RISK 505
Introduction to Part IV 507
17 Operational Risk: Definition, Measurement and Management 511
17.1 Introduction 511
xiv Contents
17.2 OR: How can we define it? 512
17.2.1 OR risk factors 512
17.2.2 Some peculiarities of OR 514
17.3 Measuring OR 517
17.3.1 Identifying the risk factors 518
17.3.2 Mapping business units and estimating risk exposure 518
17.3.3 Estimating the probability of the risky events 519
17.3.4 Estimating the losses 522
17.3.5 Estimating expected loss 524
17.3.6 Estimating unexpected loss 527
17.3.7 Estimating Capital at Risk against OR 529
17.4 Towards an OR management system 533
17.5 Final remarks 535
Selected Questions and Exercises 537
Appendix 17A OR measurement and EVT 539
PART V REGULATORY CAPITAL REQUIREMENTS 543
Introduction to Part V 545
18 The 1988 Capital Accord 547
18.1 Introduction 547
18.2 The capital ratio 549
18.2.1 Regulatory capital (RC) 549
18.2.1.1 Tier 1 capital 549
18.2.1.2 Supplementary capital (Tier 2 and Tier 3) 552
18.2.2 Risk weights (w, ) 554
18.2.3 Assets included in the capital ratio (A,) 555
18.3 Shortcomings of the capital adequacy framework 555
18.3.1 Focus on credit risk only 556
18.3.2 Poor differentiation of risk 556
18.3.3 Limited recognition of the link between maturity and credit
risk 556
18.3.4 Disregard for portfolio diversification 556
18.3.5 Limited recognition of risk mitigation tools 559
18.3.6 "Regulatory arbitrage" 559
18.4 Conclusions 559
Selected Questions and Exercises 559
Appendix 18A The Basel Committee 563
19 The Capital Requirements for Market Risks 565
19.1 Introduction 565
19.2 Origins and characteristics of capital requirements 565
19.2.1 Origins of the requirements 565
19.2.2 Logic and scope of application 566
19.2.3 The "building blocks" approach 567
Contents xv
19.2.4 Tier 3 Capital 568
19.3 The capital requirement on debt securities 568
19.3.1 The requirement for specific risk 568
19.3.2 The requirement for generic risk 569
19.4 Positions in equity securities: specific and generic requirements 575
19.5 The requirement for positions in foreign currencies 576
19.6 The requirement for commodity positions 578
19.7 The use of internal models 578
19.7.1 Criticism of the Basel Committee proposals 578
19.7.2 The 1995 revised draft 579
19.7.3 The final amendment of January 1996 581
19.7.4 Advantages and limitations of the internal model approach 582
19.7.5 The pre commitment approach 583
Selected Questions and Exercises 585
Appendix 19A Capital Requirements Related to Settlement,
Counterparty and Concentration Risks 588
20 The New Basel Accord 591
20.1 Introduction 591
20.2 Goals and Contents of the Reform 591
20.3 Pillar One: The Standard Approach to Credit Risk 593
20.3.1 Risk Weighting 593
20.3.2 Collateral and Guarantees 596
20.4 The Internal Ratings based Approach 597
20.4.1 Risk Factors 597
20.4.2 Minimum Requirements of the Internal Ratings System 600
20.4.3 From the Rating System to the Minimum Capital
Requirements 603
20.5 Pillar Two: A New Role for Supervisory Authorities 612
20.6 Pillar Three: Market Discipline 614
20.6.1 The Rationale Underlying Market Discipline 614
20.6.2 The Reporting Obligations 614
20.6.3 Other Necessary Conditions for Market Discipline 615
20.7 Pros and Cons of Basel II 616
20.8 The Impact of Basel II 619
20.8.1 The Impact on First Implementation 619
20.8.2 The Dynamic Impact: Procyclicality 623
Selected Questions and Exercises 630
21 Capital Requirements on Operational Risk 633
21.1 Introduction 633
21.2 The capital requirement on operational risk 633
21.2.1 The Basic Indicator Approach 634
21.2.2 The Standardized Approach 635
21.2.3 The requirements for adopting the standardized approach 638
21.2.4 Advanced measurement approaches 638
xvi Contents
21.2.5 The requirements for adopting advanced approaches 639
21.2.6 The role of the second and third pillars 644
21.2.7 The role of insurance coverage 644
21.3 Weaknesses of the 2004 Accord 645
21.4 Final remarks 647
Selected Questions and Exercises 647
PART VI CAPITAL MANAGEMENT AND VALUE CREATION 651
Introduction to Part VI 653
22 Capital Management 657
22.1 Introduction 657
22.2 Defining and measuring capital 658
22.2.1 The definition of capital 658
22.2.2 The relationship between economic capital and available
capital 661
22.2.3 Calculating a bank's economic capital 663
22.2.4 The relationship between economic capital and regulatory
capital 667
22.2.5 The constraints imposed by regulatory capital: implications
on pricing and performance measurement 671
22.2.6 The determinants of capitalization 674
22.3 Optimizing regulatory capital 675
22.3.1 Technical features of the different regulatory capital
instruments 676
22.3.2 The actual use of the various instruments included within
regulatory capital 680
22.4 Other instruments not included within regulatory capital 685
22.4.1 Insurance capital 685
22.4.2 Contingent capital 687
Selected Questions and Exercises 691
23 Capital Allocation 693
23.1 Introduction 693
23.2 Measuring capital for the individual business units 694
23.2.1 The "benchmark capital" approach 695
23.2.2 The model based approach 695
23.2.3 The Earnings at Risk (EaR) approach 697
23.3 The relationship between allocated capital and total capital 702
23.3.1 The concept of diversified capital 702
23.3.2 Calculating diversified capital 703
23.3.3 Calculating the correlations used in determining diversified
capital 710
23.4 Capital allocated and capital absorbed 712
23.5 Calculating risk adjusted performance 715
Contents xvii
23.6 Optimizing the allocation of capital 722
23.6.1 A model for optimal capital allocation 722
23.6.2 A more realistic model 724
23.7 The organizational aspects of the capital allocation process 726
Selected Questions and Exercises 728
Appendix 23A The Correlation Approach 730
Appendix 23B The Virtual Nature of Capital Allocation 731
24 Cost of Capital and Value Creation 735
24.1 Introduction 735
24.2 The link between Risk Management and Capital Budgeting 735
24.3 Capital Budgeting in Banks and in Non Financial Enterprises 736
24.4 Estimating the Cost of Capital 739
24.4.1 The method based on the dividend discount model 739
24.4.2 The method based on the price/earnings ratio 741
24.4.3 The method based on the Capital Asset Pricing Model
(CAPM) 742
24.4.4 Caveats 744
24.5 Some empirical Examples 745
24.6 Value Creation and RAROC 750
24.7 Value Creation and EVA 753
24.8 Conclusions 756
Selected Questions and Exercises 757
Bibliography 759
Index 771 |
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| index_date | 2024-07-02T18:09:24Z |
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| spelling | Sironi, Andrea Verfasser aut Risk management and shareholders' value in banking from risk measurement models to capital allocation policies Andrea Sironi and Andrea Resti Hoboken, NJ [u.a.] Wiley 2007 XXV, 782 S. graf. Darst. txt rdacontent n rdamedia nc rdacarrier Includes bibliographical references and index Bank Asset-liability management Bank management Banks and banking Valuation Financial institutions Valuation Risk management Risikomanagement (DE-588)4121590-4 gnd rswk-swf Bankbetriebslehre (DE-588)4129045-8 gnd rswk-swf Bankbetriebslehre (DE-588)4129045-8 s Risikomanagement (DE-588)4121590-4 s DE-604 Resti, Andrea Sonstige oth http://www.loc.gov/catdir/toc/ecip077/2006102019.html Table of contents only HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=015745137&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Sironi, Andrea Risk management and shareholders' value in banking from risk measurement models to capital allocation policies Bank Asset-liability management Bank management Banks and banking Valuation Financial institutions Valuation Risk management Risikomanagement (DE-588)4121590-4 gnd Bankbetriebslehre (DE-588)4129045-8 gnd |
| subject_GND | (DE-588)4121590-4 (DE-588)4129045-8 |
| title | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies |
| title_auth | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies |
| title_exact_search | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies |
| title_exact_search_txtP | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies |
| title_full | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies Andrea Sironi and Andrea Resti |
| title_fullStr | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies Andrea Sironi and Andrea Resti |
| title_full_unstemmed | Risk management and shareholders' value in banking from risk measurement models to capital allocation policies Andrea Sironi and Andrea Resti |
| title_short | Risk management and shareholders' value in banking |
| title_sort | risk management and shareholders value in banking from risk measurement models to capital allocation policies |
| title_sub | from risk measurement models to capital allocation policies |
| topic | Bank Asset-liability management Bank management Banks and banking Valuation Financial institutions Valuation Risk management Risikomanagement (DE-588)4121590-4 gnd Bankbetriebslehre (DE-588)4129045-8 gnd |
| topic_facet | Bank Asset-liability management Bank management Banks and banking Valuation Financial institutions Valuation Risk management Risikomanagement Bankbetriebslehre |
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