Managing Interest Rate Risk: Duration GAP and Economic ...
[Pages:29]Managing Interest Rate Risk(II): Duration GAP and Economic Value of Equity
Measuring Interest Rate Risk with Duration GAP
Economic Value of Equity Analysis
Focuses on changes in stockholders' equity given potential changes in interest rates
Duration GAP Analysis
Compares the price sensitivity of a bank's total assets with the price sensitivity of its total liabilities to assess the impact of potential changes in interest rates on stockholders' equity.
Duration GAP
Duration GAP Model
Focuses on either managing the market value of stockholders' equity The bank can protect EITHER the market value of equity or net interest income, but not both Duration GAP analysis emphasizes the impact on equity
Compares the duration of a bank's assets with the duration of the bank's liabilities and examines how the economic value stockholders' equity will change when interest rates change.
Steps in Duration GAP Analysis
Forecast interest rates. Estimate the market values of bank assets,
liabilities and stockholders' equity. Estimate the weighted average duration of
assets and the weighted average duration of liabilities.
Incorporate the effects of both on- and offbalance sheet items. These estimates are used to calculate duration gap.
Forecasts changes in the market value of stockholders' equity across different interest rate environments.
Weighted Average Duration of Bank Assets
Weighted Average Duration of Bank Assets (DA)
n
DA wiDai i
Where
wi = Market value of asset i divided by the market value of all bank assets
Dai = Macaulay's duration of asset i n = number of different bank assets
Weighted Average Duration of Bank Liabilities
Weighted Average Duration of Bank Liabilities (DL)
m
DL zjDlj j
Where
zj = Market value of liability j divided by the market value of all bank liabilities
Dlj= Macaulay's duration of liability j m = number of different bank liabilities
Duration GAP and Economic Value of Equity
Let MVA and MVL equal the market values of assets and liabilities, respectively.
If: EVE MVA MVL
and
Duration GAP
DGAP DA - (MVL/MVA)DL
Then:
EVE
-
DGAP
y (1 y)
MVA
where y = the general level of interest rates
To protect the economic value of equity against any change when rates change , the bank could set the duration gap to zero:
Hypothetical Bank Balance Sheet
1
Par
Years
Market
$1,000 % Coup Mat. YTM Value
Assets
Cash
$100
$ 100
Earning assets
3-yr Commercial loan
$ 700 12.00% 3 12.00% $ 700
84 6-yr Treasury bond Total Earning Assets
1
Non-cash earning
Total assets D
a(1ss.1et2s)1
$
$
$
(2981-004.0012)228.00%(184.126)33
$ 1,000
1(7181..010.1010%%2)33$$$
200 900 -
10.00% $ 1,000
700
Liabilities
Interest bearing liabs.
1-yr Time deposit
$ 620 5.00% 1
5.00% $ 620
3-yr Certificate of deposit $ 300 7.00% 3
7.00% $ 300
Tot. Int Bearing Liabs. $ 920
5.65% $ 920
Tot. non-int. bearing
$ -
$ -
Total liabilities
$ 920
5.65% $ 920
Total equity
$ 80
$ 80
Total liabs & equity
$ 1,000
$ 1,000
Dur.
2.69 4.99 2.88
1.00 2.81 1.59
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