(1). INTREST-RATE-EXPOSURE
1 Income Gap: Definition and Measurement We use
the definition of the income gap of a financial institution in
Mishkin and Eakins (2009):
Income Gap = RSA − RSL
- (1) where RSA is a measure of the number of assets that either
reprice, or mature, within one year, and RSL the amount of the
liabilities that mature or reprice within a year. RSA (RSL) is the
number of dollars of assets (liability) that will pay (cost)
variable interest rate. Hence, the income gap measures the extent
to which a bank’s net interest income is sensitive to interest
rates changes. Because the income gap is a measure of exposure to
interest rate risk, Mishkin and Eakins (2009) propose to assess the
impact of a potential change in short rates ∆r on bank income by
calculating: Income Gap × ∆r
Direct evidence on Interest Rate Risk
Hedging
- In this section, we ask whether banks use derivatives to
neutralize their “natural” exposure to interest rate risk. We can
check this directly in the data. The schedule HC-L of the form FR
Y9C reports, starting in 1995, the notional amounts in interest
derivatives contracted by banks. Five kinds of derivative contracts
are separately reported: Futures (bhck8693), Forwards (bhck8697),
Written options that are exchange-traded (bhck8701), Purchased
options that are exchange-traded (bhck8705), Written options traded
over the counter (bhck8709), Purchased options traded over the
counter (bhck8713), and Swaps (bhck3450)
and also NCDs shall not be issued for
maturities of less than 90 days from the date of
issue. The maturity date of the NCD shall
co-terminate with the date up to which the credit rating of the
issuer is valid.
Bank profits are exposed to
interest rates movements. The gap between the
interest rate sensitivities of assets and
liabilities is called the “income gap”: it measures the extent to
which banking profits respond to monetary policy
tightening
(2). Banks often hedge against
interest rate risk using only interest rate
futures contracts or foreign exchange risk of a
particular currency one at a time using only the
corresponding currency forward contract, thus separating the
management of interest rate risk from foreign
exchange risk.
- Single direct hedge outperforms the composite hedge in reducing
foreign exchange risk for banks that manage interest rate risk
separately from foreign exchange risk.
- The integrated hedge of both interest rate and foreign exchange
risk with a single instrument of interest rate futures effectively
outperforms the corresponding hedge with composite instruments in
terms of reducing risks.
- Integrated hedge with currency forwards alone shows the poorest
hedging effectiveness.