interest rate risk i chapter 8 © 2006 the mcgraw-hill companies, inc., all rights reserved. k. r....

Interest Rate Risk IInterest Rate Risk I

Chapter 8

© 2006 The McGraw-Hill Companies, Inc., All Rights Reserved.

K. R. Stanton

McGraw-Hill/Irwin

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Overview

This chapter discusses the interest rate risk associated with financial intermediation: Federal Reserve monetary policy Repricing model Maturity model Duration model *Term structure of interest rate risk *Theories of the term structure of interest

rates

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Central Bank & Interest Rate Risk

Federal Reserve Bank: U.S. central bank Open market operations influence money

supply, inflation, and interest rates Targeting of bank reserves in U.S. proved

disastrous Oct-1979 to Oct-1982, nonborrowed

reserves target regime. Implications of reserves target policy:

Increases importance of measuring and managing interest rate risk.

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Central Bank and Interest Rate Risk

Effects of interest rate targeting. Lessens interest rate risk

Greenspan view: Risk Management Focus on Federal Funds Rate Simple announcement of Fed Funds increase,

decrease, or no change.

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Repricing Model

Repricing or funding gap model based on book value.

Contrasts with market value-based maturity and duration models recommended by the Bank for International Settlements (BIS).

Rate sensitivity means time to repricing. Repricing gap is the difference between the

rate sensitivity of each asset and the rate sensitivity of each liability: RSA - RSL.

Refinancing risk

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Maturity Buckets

Commercial banks must report repricing gaps for assets and liabilities with maturities of: One day. More than one day to three months. More than 3 three months to six months. More than six months to twelve months. More than one year to five years. Over five years.

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Repricing Gap Example

Assets Liabilities Gap Cum. Gap

1-day $ 20 $ 30 $-10 $-10

>1day-3mos. 30 40 -10 -20

>3mos.-6mos. 70 85 -15 -35

>6mos.-12mos. 90 70 +20 -15

>1yr.-5yrs. 40 30 +10 -5

>5 years 10 5 +5 0

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Applying the Repricing Model

NIIi = (GAPi) Ri = (RSAi - RSLi) ri

Example: In the one day bucket, gap is -$10 million. If rates

rise by 1%,

NII(1) = (-$10 million) × .01 = -$100,000.

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Applying the Repricing Model

Example II:

If we consider the cumulative 1-year gap,

NII = (CGAPone year) R = (-$15 million)(.01)

= -$150,000.

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Rate-Sensitive Assets

Examples from hypothetical balance sheet: Short-term consumer loans. If repriced at year-

end, would just make one-year cutoff. Three-month T-bills repriced on maturity every

3 months. Six-month T-notes repriced on maturity every 6

months. 30-year floating-rate mortgages repriced (rate

reset) every 9 months.

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Rate-Sensitive Liabilities

RSLs bucketed in same manner as RSAs. Demand deposits and passbook savings

accounts warrant special mention. Generally considered rate-insensitive (act as

core deposits), but there are arguments for their inclusion as rate-sensitive liabilities.

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CGAP Ratio

May be useful to express CGAP in ratio form as,

CGAP/Assets. Provides direction of exposure and Scale of the exposure.

Example: CGAP/A = $15 million / $270 million = 0.56, or

5.6 percent.

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Equal Rate Changes on RSAs, RSLs

Example: Suppose rates rise 2% for RSAs and RSLs. Expected annual change in NII,

NII = CGAP × R

= $15 million × .01

= $150,000 With positive CGAP, rates and NII move in

the same direction. Change proportional to CGAP

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Unequal Changes in Rates

If changes in rates on RSAs and RSLs are not equal, the spread changes. In this case,

NII = (RSA × RRSA ) - (RSL × RRSL )

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Unequal Rate Change Example

Spread effect example:

RSA rate rises by 1.2% and RSL rate rises by 1.0%

NII = interest revenue - interest expense

= ($155 million × 1.2%) - ($155 million × 1.0%)

= $310,000

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Restructuring Assets & Liabilities

The FI can restructure its assets and liabilities, on or off the balance sheet, to benefit from projected interest rate changes. Positive gap: increase in rates increases NII Negative gap: decrease in rates increases NII Example: State Street Boston

Good luck? Or Good Management?

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Weaknesses of Repricing Model

Weaknesses: Ignores market value effects and off-balance

sheet (OBS) cash flows Overaggregative

Distribution of assets & liabilities within individual buckets is not considered. Mismatches within buckets can be substantial.

Ignores effects of runoffs Bank continuously originates and retires consumer

and mortgage loans. Runoffs may be rate-sensitive.

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The Maturity Model

Explicitly incorporates market value effects. For fixed-income assets and liabilities:

Rise (fall) in interest rates leads to fall (rise) in market price.

The longer the maturity, the greater the effect of interest rate changes on market price.

Fall in value of longer-term securities increases at diminishing rate for given increase in interest rates.

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Maturity of Portfolio

Maturity of portfolio of assets (liabilities) equals weighted average of maturities of individual components of the portfolio.

Principles stated on previous slide apply to portfolio as well as to individual assets or liabilities.

Typically, maturity gap, MA - ML > 0 for most banks and thrifts.

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Effects of Interest Rate Changes

Size of the gap determines the size of interest rate change that would drive net worth to zero.

Immunization and effect of setting

MA - ML = 0.

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Maturities and Interest Rate Exposure

If MA - ML = 0, is the FI immunized? Extreme example: Suppose liabilities consist of

1-year zero coupon bond with face value $100. Assets consist of 1-year loan, which pays back $99.99 shortly after origination, and 1¢ at the end of the year. Both have maturities of 1 year.

Not immunized, although maturity gap equals zero.

Reason: Differences in duration*

*(See Chapter 9)

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Maturity Model

Leverage also affects ability to eliminate interest rate risk using maturity model Example:

Assets: $100 million in one-year 10-percent bonds, funded with $90 million in one-year 10-percent deposits (and equity)

Maturity gap is zero but exposure to interest rate risk is not zero.

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Duration

The average life of an asset or liability The weighted-average time to maturity

using present value of the cash flows, relative to the total present value of the asset or liability as weights.

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*Term Structure of Interest Rates

YTM

Time to Maturity

Time to Maturity

Time to Maturity

Time to Maturity

YTM

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*Unbiased Expectations Theory

Yield curve reflects market’s expectations of future short-term rates.

Long-term rates are geometric average of current and expected short-term rates._ _ ~ ~

RN = [(1+R1)(1+E(r2))…(1+E(rN))]1/N - 1

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*Liquidity Premium Theory

Allows for future uncertainty. Premium required to hold long-term.

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*Market Segmentation Theory

Investors have specific needs in terms of maturity.

Yield curve reflects intersection of demand and supply of individual maturities.

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Pertinent Websites

For information related to central bank policy, visit:

Bank for International Settlements: www.bis.org

Federal Reserve Bank: www.federalreserve.gov

interest rate risk i chapter 8 © 2006 the mcgraw-hill companies, inc., all rights reserved. k. r....

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