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01.2 credit risk factors and measures
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01.2 credit risk factors and measures
1.
Copyright © 2018
CapitaLogic Limited Chapter 1 Credit Risk Factors and Measures This presentation file is prepared in accordance with Chapter 1 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
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.
Copyright © 2018
CapitaLogic Limited 3 Introduction Credit risk factors Credit risk measures A simple loan Appendices Outline
4.
Copyright © 2018
CapitaLogic Limited 4 Banking activities Deposits < 1% Shareholders’ equity Dividend + equity price appreciation 3% - 20% Term loans, credit cards, mortgages, corporate bonds Bank
5.
Copyright © 2018
CapitaLogic Limited 5 Funding source Loan Private lending placement Bond A loan transferable among lenders Equity Media focus in developed countries and China DEBT
6.
Copyright © 2018
CapitaLogic Limited 6 Credit Credit The idea that a borrower uses other people’s monies in pursuit of his financial needs Spend today but pay tomorrow Interest To compensate a lender for supplying temporary funds to a borrower Time value of money Default of borrower Service charge
7.
Copyright © 2018
CapitaLogic Limited 7 Time value of money Bank My money today USD 10,000 My money in one year USD 10,000 + USD 1,200 Principal + interest
8.
Copyright © 2018
CapitaLogic Limited 8 Default A borrower fails to pay to the lender the interest and/or principal in full on schedule Debt collection efforts will then be initiated by the lender to recover the whole or part of the principal plus interest
9.
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CapitaLogic Limited 9 Credit risk In this book, credit risk means The risk of loss to a lender caused by the default of a debt intended to be held until maturity; or for a longer period of time (> 1 year) A lender must charge a nominal yield higher than the risk-free rate to compensate the credit risk
10.
Copyright © 2018
CapitaLogic Limited 10 Credit risk management Credit risk management Credit risk identification Credit risk measurement Credit risk monitoring Credit risk mitigation
11.
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CapitaLogic Limited 11 Credit risk factors and measures Single debt Debt portfolio EL/ 1-year EL EAD LGD PD RM XCL EAD LGD PD Concen -tration Default depend -ency
12.
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CapitaLogic Limited 12 Basel Accord A hybrid approach consolidates theories and practices of Finance – economic reasoning Accounting – rule based Statistics – scientific quantification Banking operations – industry practices Regulatory considerations – views from bank regulators Currently the most comprehensive credit risk management framework with international recognition Scale down version may be applied to other industries
13.
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CapitaLogic Limited 13 Introduction Credit risk factors Credit risk measures A simple loan Appendices Outline
14.
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CapitaLogic Limited 14 Credit risk factors Credit risk Default loss Exposure at default Default chance Probability of default Loss given default Residual maturity
15.
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CapitaLogic Limited 15 Exposure at default (EAD) The amount that a borrower owes a lender when the borrower defaults For many debts Term loans, mortgages and corporate bonds EAD = Principal + Interest Example 1.1
16.
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CapitaLogic Limited 16 Exposure at default Revolving loan Subject to a credit limit Credit card, credit line Outstanding debt amount varys over time EAD <= credit limit In general approaching credit limit
17.
Copyright © 2018
CapitaLogic Limited 17 Loss given default (LGD) Default loss The net amount suffered by a lender when a borrower defaults LGD The net default loss expressed as a percentage of the EAD Polarized due to collateral arrangement With excessive collaterals: 0% to 20%, typical 10% Without collaterals: 80% to 100%, typical 90% Example 1.2
18.
Copyright © 2018
CapitaLogic Limited 18 Probability of default (PD) The chance that a borrower will default in the following ONE year Credit quality of a borrower Forward looking Ranging from 0% (will surely survive) to 100% (will definitely default) Example 1.3
19.
Copyright © 2018
CapitaLogic Limited 19 Residual maturity (RM) The remaining time horizon over which a debt will generate cash flows to a lender Example 1.4
20.
Copyright © 2018
CapitaLogic Limited 20 Introduction Credit risk factors Credit risk measures A simple loan Appendices Outline
21.
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CapitaLogic Limited 21 Default loss By definition Default loss LGD = EAD Default loss = EAD × LGD
22.
Copyright © 2018
CapitaLogic Limited 22 Default chance The chance that a borrower will default during the remaining lending period RM years RM RM 1 - Default chance = 1 - PD Default chance = 1 - 1 - PD
23.
Bernoulli distribution 0% 20% 40% 60% 80% 100% To survive
To default Copyright © 2018 CapitaLogic Limited 23
24.
Risk map Larger loss
at lower chance Preferred debts Smaller loss at higher chance Default chance → Copyright © 2018 Dr. LAM Yat-fai Defaultloss→ 24
25.
Copyright © 2018
CapitaLogic Limited 25 Expected loss The default loss weighted by the default chance For a debt with short to medium RM where the EAD, LGD and PD can be estimated with sufficient accuracy RM Expected loss = Default loss × Default chance EL = EAD × LGD × 1 - 1 - PD
26.
Copyright © 2018
CapitaLogic Limited 26 Convenient approximation to the EL For small PD and short RM e.g. PD < 3% and RM < 5 years A practical situation of most short to medium term debts in a real bank lending operation The EL is approximated conveniently as EL ≈ EAD × LGD × PD × RM Increase in any credit risk factors will increase the EL
27.
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CapitaLogic Limited 27 Expected loss of a single debt (+) (+) EL = EAD × LGD × [1 - (1 - PD)RM] ≈ EAD × LGD × PD × RM when PD (< 3%) and RM (< 5 years) are relatively small in real bank lending (+) EL/ 1-year EL EAD LGD PD RM(+)
28.
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CapitaLogic Limited 28 A debt with longer term RM Longer term debt Remote maturity day Difficult to estimate a set of reliable EAD, LGD, and PD throughout the remaining life of the debt The lender will review and control the credit risk at the end of the following ONE year The economic risk horizon is one year The RM is set artificially to one year
29.
Copyright © 2018
CapitaLogic Limited 29 One-year expected loss For a debt with the RM < 1 No credit risk review and control during its life 1-year EL = EL The EL in one year 1 RM RM 1-year EL = EAD × LGD × Min 1 - 1 - PD , 1 - 1 - PD = EAD × LGD × Min PD , 1 - 1 - PD EAD × LGD × PD × Min 1, RM Example 1.5
30.
Copyright © 2018
CapitaLogic Limited 30 A debt with no fixed RM Revolving loan On-going drawdown transactions On-going re-payment transactions No fixed maturity day The lender will review and control the credit risk at the end of the following ONE year The economic risk horizon is one year The RM is set artificially to one year
31.
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CapitaLogic Limited 31 One-year expected loss The EL in one year Three credit risk factors only EAD, LGD and PD 1 1-year EL = EAD × LGD × Min 1 - 1 - PD , 1 - 1 - PD = EAD × LGD × Min PD , 1 - 1 - PD = EAD × LGD × PD
32.
Copyright © 2018
CapitaLogic Limited 32 Which credit risk measure should be used? Residual maturity Credit risk measure Short to medium term only EL Longer term only 1-year EL No fixed maturity only 1-year EL Short term, medium term longer term and no fixed maturity 1-year EL = EL for short term debts 1-year EL = EL in one year for debts with the RM > 1 year
33.
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CapitaLogic Limited 33 Introduction Credit risk factors Credit risk measures A simple loan Appendices Outline
34.
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CapitaLogic Limited 34 A simple loan EAD USD 10,000 LGD 90% PD 3% RM 3 years Default loss 8,000 Default chance 8.7327% EL USD 786 1-year EL USD 270 Example 1.6
35.
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CapitaLogic Limited 35 A simple loan Functional purpose Borrower Needs immediate cash Lender With spare cash for three years To seek an excess return over the risk-free rate Cash flows Out Principal at origination In Principal at maturity Interest at maturity Default Principal and/or interest not paid in full on schedule Debt collection 100 ? Loan
36.
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CapitaLogic Limited 36 Introduction Credit risk factors Credit risk measures A simple loan Appendices Outline
37.
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CapitaLogic Limited 37 Standard normal distribution Distribution Thick middle Thin tails Symmetric Mean 0 Standard deviation 1 Density Value of the curve Cumulate Area to the left of x x x Φ x
38.
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CapitaLogic Limited 38 Standard normal distribution functions Cumulative standard normal distribution function Inverse cumulative standard normal distribution function -1 2 x - 2 x -1 - Φ 1 τ Φ x = exp - dτ 22π = Normsdist x 0,1 1 τ x = exp - dτ 22π = NormsΦ inv x - ,+x Example 1.7
39.
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CapitaLogic Limited 39 Probit 2 Probit - 1 τ PD = exp - dτ 22π PD = Normsdist Probit 0,1 Probit = Normsinv PD - ,+
40.
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CapitaLogic Limited 40 PD vs Probit 0% 20% 40% 60% 80% 100% -5 -4 -3 -2 -1 0 1 2 3 4 5 Probit = Normsinv(PD) PD=Normsdist(Probit)
41.
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CapitaLogic Limited 41 Credit risk measurements of debts vs market risk measurements of equities Credit risk of debts 1-year EL rate = LGD × PD EAD Bernoulli distribution PD Copula correlation coefficient 1-year 99.9% XCL Market risk of equities Expected return Equity value Normal distribution Standard deviation Beta 10-day 99% VaR