© 2004 South-Western Publishing 1 Chapter 12 Futures Contracts and Portfolio Management.
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Transcript of © 2004 South-Western Publishing 1 Chapter 12 Futures Contracts and Portfolio Management.
3
The Concept of Immunization
Introduction Bond risks Duration matching Duration shifting Hedging with interest rate futures Increasing duration with futures Disadvantages of immunizing
4
Introduction
An immunized bond portfolio is largely protected from fluctuations in market interest rates– Seldom possible to eliminate interest rate risk
completely – A portfolio’s immunization can wear out, requiring
managerial action to reinstate the portfolio– Continually immunizing a fixed-income portfolio can
be time-consuming and technical
5
Bond Risks
A fixed income investor faces three primary sources of risk:– Credit risk– Interest rate risk– Reinvestment rate risk
6
Bond Risks (cont’d)
Credit risk is the likelihood that a borrower will be unable or unwilling to repay a loan as agreed– Rating agencies measure this risk with
bond ratings– Lower bond ratings mean higher expected
returns but with more risk of default– Investors choose the level of credit risk
that they wish to assume
7
Bond Risks (cont’d)
Interest rate risk is a consequence of the inverse relationship between bond prices and interest rates– Duration is the most widely used measure of a
bond’s interest rate risk
8
Bond Risks (cont’d)
Reinvestment rate risk is the uncertainty associated with not knowing at what rate money can be put back to work after the receipt of an interest check– The reinvestment rate will be the
prevailing interest rate at the time of reinvestment, not some rate determined in the past
10
Introduction
Duration matching selects a level of duration that minimizes the combined effects of reinvestment rate and interest rate risk
Two versions of duration matching:– Bullet immunization– Bank immunization
11
Bullet Immunization
Seeks to ensure that a predetermined sum of money is available at a specific time in the future regardless of interest rate movements
12
Bullet Immunization (cont’d)
Objective is to get the effects of interest rate and reinvestment rate risk to offset– If interest rates rise, coupon proceeds can be
reinvested at a higher rate– If interest rates fall, proceeds can be reinvested
at a lower rate
13
Bullet Immunization (cont’d)
Bullet Immunization Example
A portfolio managers receives $93,600 to invest in bonds and needs to ensure that the money will grow at a 10% compound rate over the next 6 years (it should be worth $165,818 in 6 years).
14
Bullet Immunization (cont’d)
Bullet Immunization Example (cont’d)
The portfolio manager buys $100,000 par value of a bond selling for 93.6% with a coupon of 8.8%, maturing in 8 years, and a yield to maturity of 10.00%.
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Bullet Immunization Example (cont’d)Panel A: Interest Rates Remain Constant
Bullet Immunization (cont’d)
Year 1 Year 2 Year 3 Year 4 Year 5 Year 6$8,800 $9,680 $10,648 $11,713 $12,884 $14,172
$8,800 $9,680 $10,648 $11,713 $12,884 $8,800 $9,680 $10,648 $11,713 $8,800 $9,680 $10,648 $8,800 $9,680
Interest $68,805 Bond Total $165,817
$8,800
$97,920
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Bullet Immunization (cont’d)
Bullet Immunization Example (cont’d)Panel B: Interest Rates Fall 1 Point in Year 3
Year 1 Year 2 Year 3 Year 4 Year 5 Year 6$8,800 $9,680 $10,648 $11,606 $12,651 $13,789
$8,800 $9,680 $10,551 $11,501 $12,536 $8,800 $9,592 $10,455 $11,396 $8,800 $9,592 $10,455 $8,800 $9,592
Interest $66,568 Bond Total $166,218
$8,800
$99,650
17
Bullet Immunization (cont’d)
Bullet Immunization Example (cont’d)Panel C: Interest Rates Rise 1 Point in Year 3
Year 1 Year 2 Year 3 Year 4 Year 5 Year 6$8,800 $9,680 $10,648 $11,819 $13,119 $14,563
$8,800 $9,680 $10,745 $11,927 $13,239 $8,800 $9,768 $10,842 $12,035 $8,800 $9,768 $10,842 $8,800 $9,768
Interest $69,247 Bond Total $165,477
$8,800
$96,230
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Bullet Immunization (cont’d)
Bullet Immunization Example (cont’d)
The compound rates of return in the three scenarios are 10.10%, 10.04%, and 9.96%, respectively.
19
Bank Immunization
Addresses the problem that occurs if interest-sensitive liabilities are included in the portfolio– E.g., a bank’s portfolio manager is concerned
with the entire balance sheet– A bank’s funds gap is the dollar value of its
interest rate sensitive assets (RSA) minus its interest rate sensitive liabilities (RSL)
20
Bank Immunization (cont’d)
To immunize itself, a bank must reorganize its balance sheet such that:
sliabilitieor assets ofduration average weighted-dollar
sliabilitieor assets sensitiveinterest of uedollar val$
where
$$
,
,
LA
LA
LLAA
D
DD
21
Bank Immunization (cont’d)
A bank could have more interest-sensitive assets than liabilities:– Reduce RSA or increase RSL to immunize
A bank could have more interest-sensitive liabilities than assets:– Reduce RSL or increase RSA to immunize
22
Duration Shifting
The higher the duration, the higher the level of interest rate risk
If interest rates are expected to rise, a bond portfolio manager may choose to bear some interest rate risk (duration shifting)
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Duration Shifting (cont’d)
The shorter the maturity, the lower the duration
The higher the coupon rate, the lower the duration
A portfolio’s duration can be reduced by including shorter maturity bonds or bonds with a higher coupon rate
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Duration Shifting (cont’d)
Maturity
Coupon
Lower Higher
Lower Ambiguous Duration Lower
Higher Duration Higher
Ambiguous
25
Hedging With Interest Rate Futures
A financial institution can use futures contracts to hedge interest rate risk
The hedge ratio is:
)1(
)1(
bff
ctdbbctd YTMDP
YTMDPCFHR
26
Hedging With Interest Rate Futures (cont’d)
The number of contracts necessary is given by:
ratio hedge000,100$
par value portfolio contracts #
27
Hedging With Interest Rate Futures (cont’d)
Futures Hedging Example
A bank portfolio holds $10 million face value in government bonds with a market value of $9.7 million, and an average YTM of 7.8%. The weighted average duration of the portfolio is 9.0 years. The cheapest to deliver bond has a duration of 11.14 years, a YTM of 7.1%, and a CBOT correction factor of 1.1529.
An available futures contract has a market price of 90 22/32 of par, or 0.906875. What is the hedge ratio? How many futures contracts are needed to hedge?
28
Hedging With Interest Rate Futures (cont’d)
Futures Hedging Example (cont’d)
The hedge ratio is:
9898.0078.114.11906875.0
071.10.997.01529.1
HR
29
Hedging With Interest Rate Futures (cont’d)
Futures Hedging Example (cont’d)
The number of contracts needed to hedge is:
98.989898.0000,100$
0$10,000,00 contracts #
30
Increasing Duration With Futures
Extending duration may be appropriate if active managers believe interest rates are going to fall
Adding long futures positions to a bond portfolio will increase duration
31
Increasing Duration With Futures (cont’d)
One method for achieving target duration is the basis point value (BPV) method– Gives the change in the price of a bond for a one
basis point change in the yield to maturity of the bond
32
Increasing Duration With Futures (cont’d)
To change the duration of a portfolio with the BPV method requires calculating three BPVs:
futures
currenttarget
BPV
BPVBPVcontracts #
33
Increasing Duration With Futures (cont’d)
The current and target BPVs are calculated as follows:
)2/1(
0.0001size portfoliodurationBPV targetcurrent, R
34
Increasing Duration With Futures (cont’d)
The BPV of the cheapest to deliver bond is calculated as follows:
factor conversion)2/1(
0.0001size portfoliodurationBPVfutures
R
35
Increasing Duration With Futures (cont’d)
BPV Method Example
A portfolio has a market value of $10 million, an average yield to maturity of 8.5%, and duration of 4.85. A forecast of declining interest rates causes a bond manager to decide to double the portfolio’s duration. The cheapest to deliver Treasury bond sells for 98% of par, has a yield to maturity of 7.22%, duration of 9.7, and a conversion factor of 1.1223. Compute the relevant BPVs and determine the number of futures contracts needed to double the portfolio duration.
36
Increasing Duration With Futures (cont’d)
BPV Method Example (cont’d)
28.652,4$)2/085.01(
0.0001000,000,10$4.85BPVcurrent
56.304,9$)2/085.01(
0.0001000,000,10$9.70BPVtarget
37
Increasing Duration With Futures (cont’d)
BPV Method Example (cont’d)
42.83$1223.1)2/0722.01(
0.0001000,100$9.70BPVctd
38
Increasing Duration With Futures (cont’d)
BPV Method Example (cont’d)
The number of contracts needed to double the portfolio duration is:
77.55$83.42
$4,652.28-$9,304.56contracts #
39
Disadvantages of Immunizing
Opportunity cost of being wrong Lower yield Transaction costs Immunization: instantaneous only
40
Opportunity Cost of Being Wrong
If the market is efficient, it is very difficult to forecast changes in interest rates
An incorrect forecast can lead to an opportunity cost of immunized portfolios
41
Lower Yield
Immunization usually results in a lower level of income generated by the funds under management
By reducing the portfolio duration, the portfolio return will shift to the left on the yield curve, resulting in a lower level of income
42
Transaction Costs
Costs include:– Trading fees– Brokerage commissions– Bid-ask spread – Tax liabilities
43
Immunization: Instantaneous Only
Durations and yields to maturity change every day– A portfolio may be immunized only temporarily
44
Altering Asset Allocation With Futures
Tactical changes Initial situation Bond adjustment Stock adjustment Neutralizing cash
45
Tactical Changes
Investment policy statements may give the portfolio manager some latitude in how to split the portfolio between equities and fixed income securities
The portfolio manager can mix both T-bonds and S&P 500 futures into the portfolio to adjust asset allocation without disturbing existing portfolio components
46
Initial Situation
Portfolio market value = $175 million Invested 82% in stock (average beta = 1.10)
and 18% in bonds (average duration = 8.7; average YTM = 8.00%)
The portfolio manager wants to reduce the equity exposure to 60% stock
47
Initial Situation (cont’d)
Existing Asset Allocation
Stock82%
Bonds18%
Desired Asset Allocation
Stock60%
Bonds40%
48
Initial Situation (cont’d)
Stock Index Futures September settlement = 1020.00
Treasury Bond Futures
September settlement = 91.05 Cheapest to deliver bond:
– Price = 95%– Maturity = 18 years– Coupon = 9 %– Duration = 8.60– Conversion factor = 1.3275
49
Initial Situation (cont’d)
Determine:– How many contracts will remove 100% of each
market and interest rate risk– What percentage of this 100% hedge matches
the proportion of the risk we wish to retain
50
Bond Adjustment
Using the BPV technique:
351,26)2/080.01(
0.0001%)18000,000,175($8.70BPVcurrent
82.61)2/0959.01(
0.0001000,100$8.60BPVfutures
558,58)2/080.01(
0.0001%)40000,000,175($8.70BPVtarget
51
Bond Adjustment (cont’d)
The number of contracts to completely hedge the bond portion of the portfolio is:
Thus, the manager should buy 410 T-bond futures
98.52082.61
26,351-58,558
52
Stock Adjustment
For this portfolio, the hedge ratio is:
Selling 619 stock index futures would turn the stock into a synthetic T-bill
02.61910.100.020,1250$
%82000,000,175$
HR
53
Stock Adjustment (cont’d)
The current equity investment is $143,500,000
The desired equity investment is $105,000,000, which is 26.83% less than the current level
54
Stock Adjustment (cont’d)
We can use 26.83% of the stock index futures hedge ratio:
08.16602.619%83.26
55
Stock Adjustment (cont’d)
The portfolio manager can change the asset allocation from 82% stock, 18% bonds to 60% stock, 40% bonds by– Buying 521 T-bond futures and– Selling 166 stock index futures