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04.2 heterogeneous debt portfolio
1.
Copyright © 2018
CapitaLogic Limited This presentation file is prepared in accordance with Chapter 4 of the text book “Managing Credit Risk Under The Basel III Framework, 3rd ed” Website : https://sites.google.com/site/crmbasel E-mail : crmbasel@gmail.com Chapter 4 Heterogeneous Debt Portfolios
2.
Copyright © 2018
CapitaLogic Limited 2 Declaration Copyright © 2018 CapitaLogic Limited. All rights reserved. No part of this presentation file may be reproduced, in any form or by any means, without written permission from CapitaLogic Limited. Authored by Dr. LAM Yat-fai (林日辉), Director, CapitaLogic Limited, Adjunct Professor of Finance, City University of Hong Kong, Doctor of Business Administration, CFA, CAIA, CAMS, FRM, PRM.
3.
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CapitaLogic Limited 3 Heterogeneous debt portfolios No uniform solution Relaxation of some assumptions in homogeneous portfolios Higher model error Industry practices dominate academic theories Monte Carlo simulation as the primarily feasible approach
4.
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CapitaLogic Limited 4 Outline Moody’s binominal expansion technique Structured heterogeneous portfolio Total heterogeneous portfolio Appendices
5.
Moody’s BET portfolio
Portfolio EAD Shared equally among all borrowers LGD Same for all debts PD Same for all borrowers Diversity score > 30 Default dependency Exists between two borrowers in the same industry Does not exist between two borrowers in two different industries Copyright © 2018 CapitaLogic Limited 5
6.
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CapitaLogic Limited 6 Diversification effect No. of borrowers NOB ↑ => Portfolio credit risk ↓ NOB ↓ => Portfolio credit risk ↑ Default dependency CCC ↑ => Portfolio credit risk ↑ CCC ↓ => Portfolio credit risk ↓
7.
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CapitaLogic Limited 7 Credit risk equivalent alternative portfolio CCC ↓ => Portfolio credit risk ↓ NOB↓ => Portfolio credit risk ↑ CCC → 0 NOB ?
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CapitaLogic Limited 8 No. of borrowers 1 2 3 4 5 6 7 8 9 10 1 1 2 2 3 3 4 5 6 4 7 8 9 10 5 11 12 13 14 15 6 16 17 18 19 20 21 7 22 23 24 25 26 27 28 8 29 30 31 32 33 34 35 36 9 37 38 39 40 41 42 43 44 45 10 46 47 48 49 50 51 52 53 54 55
9.
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CapitaLogic Limited 9 Diversity score Diversity score Column number = Row number - 1 + Row number
10.
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CapitaLogic Limited 10 Diversity score 1 2 3 4 5 6 7 8 9 10 1 1.00 2 1.50 2.00 3 2.33 2.67 3.00 4 3.25 3.50 3.75 4.00 5 4.20 4.40 4.60 4.80 5.00 6 5.17 5.33 5.50 5.67 5.83 6.00 7 6.14 6.29 6.43 6.57 6.71 6.86 7.00 8 7.13 7.25 7.38 7.50 7.63 7.75 7.88 8.00 9 8.11 8.22 8.33 8.44 8.56 8.67 8.78 8.89 9.00 10 9.10 9.20 9.30 9.40 9.50 9.60 9.70 9.80 9.90 10 Example 4.1
11.
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CapitaLogic Limited 11 Moody’s industry classification (1) Aerospace and defense Automotive Banking Beverage, food, and tobacco Capital equipment Chemicals, plastics and rubber Construction and building Consumer goods: durable Consumer goods: non-durable Containers, packaging and glass Energy: electricity Energy: oil and gas Environmental industries FI, retail: finance FI, retail: insurance FI, retail: real estate Forest products and paper Healthcare and pharmaceuticals High technology industries Hotel, gaming and leisure
12.
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CapitaLogic Limited 12 Moody’s industry classification (2) Media: advertising, printing and publishing Media: broadcasting and subscription Media: diversified and production Metals and mining Retail Services: business Services: consumer Government and public finance Telecommunications Transportation: cargo Transportation: consumer Utilities: electric Utilities: oil and gas Utilities: water Wholesale
13.
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CapitaLogic Limited 13 Portfolio diversity score Each borrower is classified into 1 of 35 industries For each industry, a diversity score is looked up according to the NOB Portfolio diversity score = Sum of diversity scores of individual industries Example 4.2
14.
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CapitaLogic Limited 14 Outline Moody’s binominal expansion technique Structured heterogeneous portfolio Total heterogeneous portfolio Appendices
15.
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CapitaLogic Limited 15 XCL of heterogeneous portfolio Default depen -dency Concen -tration PD LGD EAD XCL (+) (+) (+) (+) (+)
16.
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CapitaLogic Limited 16 Structured heterogeneous portfolio EAD Different for individual debts LGD Different for individual debts PD Different for individual borrowers NOB > 30 CCC Following the structure in the Basel III framework Example 4.3
17.
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CapitaLogic Limited 17 Monte Carlo simulation Generate a systematic standard normal random no. y For each borrower k (k = 1 to NOB) Generate a specific standard normal random no. zk Map to standard uniform random no. uk If uk < PDk, then borrower k defaults default loss of debt k = EADk × LGDk Portfolio default loss = Sum of all default losses Repeat the above steps for 1,000,000 time k k k ku = Normsdist y CCC + z 1 - CCC
18.
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CapitaLogic Limited 18 Portfolio credit risk measure Extreme case loss Portfolio default losses, XCL = Percentile 99.9%
19.
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CapitaLogic Limited 19 Outline Moody’s binominal expansion technique Structured heterogeneous portfolio Total heterogeneous portfolio Appendices
20.
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CapitaLogic Limited 20 Total heterogeneous portfolio EAD Different for individual debts LGD Different for individual debts PD Different for individual borrowers NOB > 30 CCC Unobservable or unquantifiable
21.
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CapitaLogic Limited 21 Lower bound simulation For each borrower k (k = 1 to NOB) Generate a specific standard normal random no. zk Map to standard uniform random no. uk If uk < PDk, then borrower k defaults default loss of debt k = EADk × LGDk Portfolio default loss = Sum of all default losses Repeat the above steps for 1,000,000 time k ku = Normsdist z Example 4.4
22.
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CapitaLogic Limited 22 Upper bound simulation Generate a systematic standard normal random no. y Map to standard uniform random no. U For each borrower k (k = 1 to NOB) If U < PDk, then borrower k defaults default loss of debt k = EADk × LGDk Portfolio default loss = Sum of all default losses Repeat the above steps for 1,000,000 time U = Normsdist y Example 4.5
23.
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CapitaLogic Limited 23 Portfolio credit risk measure Minimum XCL When CCC = 0 Maximum XCL When CCC = 1 Actual XCL in between two extremities
24.
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CapitaLogic Limited 24 Summary of the XCL calculations (1) Independent Finite Infinite * XCL Simple closed form solution with binominal distribution XCDR with Monte Carlo simulation Closed form solution with Vasicek default rate distribution EAD Coefficient of variation < 10% LGD PD Same credit rating or FICO score category RM Below one year < 10% and unified to one year NOB > 30# > 300 CCC Subject to the same CCC formula Example 4.6
25.
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CapitaLogic Limited 25 Summary of the XCL calculations (2) BET Structured* Total XCL Simple closed form solution with binominal distribution and diversity score Single XCL with Monte Carlo simulation Lower and upper bounds of the XCL with Monte Carlo simulation EAD Coefficient of variation < 10%LGD PD Same credit rating or FICO score category RM Below one year < 10% and unified to one year NOB Diversity score > 30 > 30# CCC Captured through diversity score CCC formulas in the Basel III framework Example 4.7
26.
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CapitaLogic Limited 26 Remarks * The choice of industry practices # The XCL is not an economically meaningful credit risk measure for a debt basket with less than 30 different borrowers Under such situation, credit risk of debts in a small debt basket could be well measured by the EL and/or 1-year EL on individual basis
27.
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CapitaLogic Limited 27 Outline Moody’s binominal expansion technique Structured heterogeneous portfolio Total heterogeneous portfolio Appendices
28.
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CapitaLogic Limited 28 Corporate bond portfolio For corporate bond portfolio Individual bonds are assigned Seniority Credit rating Relevant and sufficient long history of LGDs and DRs (e.g. 30 years) Example 4.8
29.
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CapitaLogic Limited 29 Historical simulation (1) One series of EAD, LGDk and DRk For each year k = 1 to N Portfolio credit risk measure k k k 1 to N Portfolio default loss = EAD × LGD × DR XCL = Max Portfolio default loss Example 4.9
30.
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CapitaLogic Limited 30 Historical simulation (2) Two series of EADh, LGDh,k and DRh,k For each year k = 1 to N Portfolio credit risk measure k 1 1,k 1,k 2 2,k 2,k 1 to N Portfolio default loss = EAD × LGD × DR + EAD × LGD × DR XCL = Max Portfolio default loss Example 4.10
31.
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CapitaLogic Limited 31 Historical simulation (3) M series of EADh, LGDh,k and DRh,k For each year k = 1 to N Portfolio credit risk measure M k h h,k h,k h=1 1 to N Portfolio default loss = EAD LGD DR XCL = Max Portfolio default loss Example 4.11