Derivatives and hedging risk

8/18/2019 Derivatives and hedging risk

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CHAPTER 26: DERIVATIVES AND HEDGINGRISK

TOPICS:

•26.1 Forward Contracts

• 26.2 Futures

• 26.3 Hedging

• 26.4 Interest Rate Futures Contracts

• 26.5 Duration Hedging


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Overview

• Risks to be managed, and the methods used to finance them.

– Commodity price risk ( futures)

– Interest rate exposure (duration hedging / swaps)

– FX exposure (derivatives)

• Hedging– Find two closely related assets

– Buy one and sell the other in proportions to minimize the risk

of your net position

– If the assets are perfectly correlated, your net position is riskfree


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How risk is managed

Production costs: $1.50/bu

Selling price in Sept.: Unknown

What can the farmer do to reduce risk?

1. Do nothing

2. Buy Crop Insurance

3. Buy a put option

4. Enter a Forward/futures contract to sell

PlantHarvest

May Sept.


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26.1 Forward Contracts

• A forward contract is an agreement to buy / sell an asset at a

particular future time for a specified price called the delivery

price

• Forward contracts are customized and not usually traded on

an exchange

• The long (short) position agrees to buy (sell) the asset on the

specified date for the delivery price

• When the contract is entered into, the delivery price is

chosen so that the value of the contract is zero to each party.– the forward price is the delivery price which makes the

contract value zero (so the forward price is equal to the

delivery price at the inception of the contract)


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Examples of a forward

• Pizza forward contract.

Order pizza by phone. Specify topping (type), size, delivery

time and location and price - fixed when contract is

established. Pay on delivery.

• Energy forward

– You buy 50,000 cubic feet (50 Mcf) of heating gas in summer

from your heating company for $10 per thousand cubic feet

(Mcf), deliverable from Jan. – March.– Long in forward: You

– Short: Heating Co.


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Payoffs From Forward Contracts

• let S T denote the spot price of the asset at the delivery date T

and let F t be the delivery price (price set at t payable at T )

• The payoffs on the delivery date are:

long position payoff: S T − F t

short position payoff: F t −

S T


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Problems with hedging with forwards

• Hedged with forwards is imperfect, since you do not know

the quantity you will have to trade.

• There is credit risk with forward contracts.

– Bipartisan arrangement

– In the previous example, if heating gas price increase sharplyin the winter, your heating company will lose, and it might

default.


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26.2 Futures

• Very similar to forwards in payoff profile, but addresses

credit risk problem by “marking-to-market” every day.

• Highly standardized contracts (delivery location, contract

size etc.), which permit exchange trading.

• The futures price is analogous to the forward price: it is the

delivery price for a futures contract– the futures price will converge to the spot price of the

underlying asset when the contract matures

• More institutional details:

– The exact delivery date is usually not specified in a futures contract; ratherit is some time interval within the delivery month

– Actual delivery rarely occurs, instead parties close out positions by taking

offsetting transactions prior to maturity. Cash settlement.

– There are commodities futures and financial futures (stocks, bonds and

currencies).


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Example: Corn Futures at CBOT

Contract Size

5,000 bushels

Deliverable Grades

No. 2 Yellow at par, No. 1 yellow at 1 1/2 cents per bushel over contractprice, No. 3 yellow at 1 1/2 cents per bushel under contract price

Price Quote

Cents/bushel

Last Trading Day

The business day prior to the 15th calendar day o the contract !onth.

Last Delivery Day

"econd business day ollowin# the last tradin# day o the delivery !onth.

$%p &ast NetCh#

'pen (i#h &ow Close $T")ol

0*+ec 312,- .3,2 31*,0 31/,0 311,- 312,- 353

4 Digit Price Quote: Fourth digit is 1/8 cent/bu


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Example

• Consider an investor who enters a futures contract expiring

one month from now to purchase 100 oz. of gold at thefutures price of $275 per ounce.

– If the spot price of gold is $290 on the expiry date, the

profit/loss is _____.

– If the investor closes out her position two week from now with

a futures price of $280 on the same contract. The spot price is

$290. Her profit/loss is ______.


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Marking to market/Margin

• Profit/loss is settled every day on a margin account

– Minimize default risk

– Details

• Initial margin

• If the value of the margin account falls below themaintenance margin, the contract holder receives a

margin call.

– You need to add $ to bring margin balance back to

initial margin level (otherwise contract will be forcedto close out.)


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Day Futures

Price $

Cash

Flow $

Starting

Margin $

Cash added to

Margin $

Ending

Margin $

1 875 0 0 6,000 6,000

2 8723 869

4 874

5 875 1,100 7,100 -1,100 6,000

6 884 900 6,900 -6,900 0

(1) What is the profit and loss to the investor, e.g. at days 2 and 3?(2) When does he receive a margin call? What to do when receiving a margin

call?

(3) What’s his ultimate gain/loss?

Example: Marking-to-market

Consider an investor who enters a futures contract to purchase 100 oz. of gold

at the futures price of $875 per ounce. Suppose that the initial margin is set at

$6,000 and the maintenance margin is set at $4,500. The contract is closed

out after 6 days.


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Futures vs. Options

• Similarities

– Deferred delivery markets

– Limited number of contracts

– Standardized contracts

– Exchange is middleman

• Differences

– Options• Longs have right, not

obligation to buy/sell

• Frequent exercise

– Futures• Both longs and shorts have

obligation to buy/sell

• Daily price limits

• Marked-to-market

• Delivery seldom occurs


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Hedging with futures—Locking in price

• There are two types of investors who use futures/forward

– Speculators: try to profit from price movements

– Hedgers: try to protect against price movement and to reduce

risk by making outcome less variable

•Short hedge (take a short position in futures) is used whenyou have asset to sell in the future

• Conversely, long hedge (take a long position in futures) is

used when you have asset to purchase in the future


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Short Hedge

• Consider a firm which will be selling an asset at some future date T,

and suppose there is a futures contract on that asset for delivery at T• The firm is exposed to the risk that the price of the asset might fall

between now and T

• If the firm takes a short position in a futures contract, its overall payoff

is:futures payoff −(F T − F 0) = −(S T − F 0)

payoff from selling asset at T S T

total F 0

i.e. the price of F 0 is locked in today• If the asset price falls, the firm loses on the asset sale but gains on the

futures contract

• If the asset price rises, the firm gains on the sale but loses on the futures

contract


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Example: Short hedge

It is November 2003. The canola farmer is worried about the price of his

crop (output). He sells canola futures; say 50 tonnes Feb 2004 at $300

per tonne. In February 2004, when the farmer harvests his crop, themarket price of canola is $250 per tonne.

– The farmer's profits from futures = _____________ per tonne

The farmer's proceeds from sale of canola = ___________ per tonne

Total =_______ per tonne

• Suppose in February 2004, when the farmer harvests his crop, the

market price of canola is $450 per tonne.

– The farmer's profits from futures = _____________ per tonne

The farmer's proceeds from sale of canola = ___________ per tonne

Total = ___________ per tonne


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Long Hedge

• Suppose instead a firm wants to purchase an asset at some future date T

• The firm is exposed to the risk that the price of the asset might rise

between now and T • If the firm takes a long position in a futures contract, its overall payoff is:

futures payoff F T − F 0 = S T − F 0

payment from purchasing asset at T -S T

total F 0i.e. the price of F 0 is locked in today

• if the asset price falls, the firm gains on the asset purchase but loses onthe futures contract– And vice versa

• Note that futures hedging does not necessarily improve the overalloutcome: you can expect to lose on the futures contract roughly half ofthe time => the objective of hedging is to reduce risk by making theoutcome less variable


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Interest Rate Futures Contracts

• Futures contract whose underlying security is a debt

obligation.

• We’ll consider interest rate futures

• Interest rate futures are used to lock into the forward termstructure (lock into future interest rates).


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Term Structure of Interest Rates

• The text coverage of this material is in Appendix 6A

• Although in almost all cases in this course we consider a flat termstructure ( interest rates of different maturities), it is important to keepin mind that this is a simplification

• With a flat term structure, discount rates are the same for all maturities,but this is rarely (if ever) the case

• For Oct. 31, 2007, the Bank of Canada reported government zerocoupon government bond yields as follows:

Maturity 1 yr 3 yr 5 yr 7 yr 10 yr 15 yr

Yield 4.18 4.16 4.18 4.21 4.28 4.37

– This means, for example, that the price on Oct. 31 of a one year zerocoupon government bond paying $1,000 at maturity was $1,000/1.0418 =$959.88, while the price of a ten year zero coupon government bondpaying $1,000 at maturity was $1,000/1.042810 = $657.64

– The rates above, which can be used to determine prices at which bondsmay be currently traded, are known as spot rates


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Pricing of Government Bonds

• Consider a Government of Canada bond that pays a semi-

annual coupon of $C for the next T/2 years (Note that thereis a total of T=2(T/2) payments):

T

T r

F C

r

C

r

C

r

C PV

)1()1()1()1(

3

3

2

21 +

+++

+

+

+

+

+

=

C

…

0 1 2 3 T

C F C +C

If the term structure is flat, i.e. r 1 = r 2 = · · · = r T = r , then the

above formula simplifies to the familiar C AT r +F/(1+ r )T


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Pricing of Interest Rate Forward Contracts

• An N-period forward contract on that Government Bond

C

…

0 N N+1 N+2 N+3 N+T

C F C +C forward P −

Can be valued as the present value of the forward price:

T N

T N

N

N

N

N

N

N r

F C

r

C

r

C

r

C +

+

+

+

+

+

+

+ +

+++

++

++

+=

)1()1()1()1(

3

3

2

2

1

1

N

N

forward

r

P PV

)1( +=

• In the above, PV is the current value of the forward contract.

• Pforward is the forward contract price (the price you’ll pay in the

future). One implies the other.


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Example

• Consider a 5-year forward contract on a 20-year

Government of Canada bond. The coupon rate is 6 percentper annum and payments are made semiannually on a parvalue of $1,000. The quoted yield to maturity is 5%.Assume that the term structure is flat. What is the value ofthe bond today? What is the forward price?


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Interest rate futures contracts and hedging

• In practice, futures contracts on bonds are typically used

rather than forward contracts

• Futures contracts on bonds are referred to as interest rate

futures contracts

•The pricing relationships derived above for forwardcontracts will only be an approximation in this context

– The exact delivery date is determined by the short party in a

futures contract

2 Y U S T N t


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2 Year U.S. Treasury Notesutures! C"#T

$%& Last 'Last 2

NetC(g

#&en )ig( Lo* Close Settle PrevSettle

)i+LoLi,it

$TS-ol

0+ec 1032520

002

1032101

1033023*

1032*5*-0

1032520

103302 11*0-

Table #enerated 'ctober 25, 200 021 C+T Chart 'ption

Contract Size 'ne C4'T .". Treasury note havin# a ace value at !aturity o 6200,000 or!ultiple thereo.

Deliverable Grades

.". Treasury notes that have an ori#inal !aturity o not !ore than 5 years and 3!onths and a re!ainin# !aturity o not less than 1 year and !onths ro! the

irst day o the delivery !onth but not !ore than 2 years ro! the last day o thedelivery !onth. The invoice price e7uals the utures settle!ent price ti!es aconversion actor plus accrued interest. The conversion actor is the price o thedelivered note 861 par value9 to yield * percent.

Price Quote

:oints 862,0009 and one 7uarter o 1/32 o a point; or e%a!ple, 11* e7uals 11*/32 ,84-165 equals 84 16.5/32


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Use interest rate futures to lock into future interest rate

Example: You own $10 million worth of 20 year 10% coupon bond(semiannual coupon payments). The term structure is flat at 5% (semi-

annual). These bonds are therefore selling at $1,000.

If the term structure shifts up uniformly to 5.5%, the new price per bond is:

Since you have 10,000 of these bonds, you have lost

You want to lock into the interest rates to prevent the loss. What shouldyou do?

0001051

0001

051

50

40

40

1

,$.

,

.t t

=+∑=

779190551

0001

0551

50

40

40

1

.$.

,

.t t =+∑

=


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Example cont’d: Opposite position in futures

Suppose government bond futures contract specifies 6-month delivery of$100,000 par value of 20 year 8% coupon bond. The current price (value) for

this futures contract is:

After the term structure shift, it is:

Each short futures contract gains

Suppose you hedge by shorting K futures contracts:

K = Size of exposure/size of futures contract

Gain on futures =

Overall : Approximately you lock into the 5% interest rate.


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Reasons in practice why interest hedging using futures

may not work perfectly

Different maturities (bonds in portfolio vs. futures contract)

• Different coupon rates

• Different risk (e.g. corporate bonds in portfolio, government

bonds in futures contract)


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Interest rate risk

• Interest rate risk — impact of changing market yields on

price

• Assume for simplicity a flat term structure. Consider these

four bonds, each with $1,000 par value and coupons paid

annually:

Note: percentage price changes are calculated relative to theprice when r = 10%, e.g. (877.93-875.66)/875.66 =

+.2592%.


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Interest rate risk cont’d

• Observations from the previous slide

– Comparing A, B, and C: low coupon bond prices are moresensitive (i.e. higher percentage price change) to changes in r ,

given the same T

– Comparing C and D: longer maturity bond prices are more

sensitive to changes in r, given the same coupon

• Rank bonds by their interest rate risk:

Bond Coupon (%) Maturity(ears)

! 9 "

B 10 7C 4 #


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Duration

• How do we measure the sensitivity of bond prices to

changes in interest rates?

• This means that the percentage change in price for a given

change in r is:


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Duration cont’d

• Duration is defined as:

• Or:

• Duration measures how long, on average, a bondholder must

wait to receive cash payments (a measure of the effective

maturity of the bond given when its cash flows occur)

∑==

T

t t tW D 1

ice Pr Bond

)r /( CF W

t t

t +

= 1

CF t = cash flow at t


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Example

Calculate the duration for a 3 year bond, P = 1,026.25, 8% annual

coupon, r = 7%

1 2 3

$ayent or &as' lo "0 "0 1*0"0

$+ o &as' ,lo 74-77 #9-"" ""1-#0

.elative value (W t ) 0-0729 0-0#"1 -"591

/ei'ted aturity (tW t )

Duration =


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Duration and Interest Rate Risk

dr Dr P

dP

+−=1

1

• Duration measures the sensitivity of bond prices to changes

in interest rates• It is the first-order approximation of price sensitivity to interest rate

• For a small change in interest rate, duration is quite an accurateestimate for percent price change

• For a given change in yield, the larger a bond's duration the greater

the impact on price (interest rate risk/sensitivity)

A bit of algebra yields:


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Example

• Which bond has the higher duration (treat each column

separately, assume everything else being equal)?

Bond Coupon Maturity Yield

A 10% 10 years 10%

B 5% 5 years 5%


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Portfolio Duration

∑==

M

iii P Dw D

1

• The duration of a portfolio P containing M bonds is:

where wi is the percentage weight of bond i in P.


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Examples

• D = 3.3, P=1,000, r = 10%, if r drops to 9%, what is the

price change as measured by duration?

• Portfolio duration

A bond mutual fund holds the following two zero-coupon bonds:

(1) 5-year maturity and 5% yield with 40% of portfolio

investment; (2) 10-year maturity and 6% yield with 60% portfolioinvestment. What’s the duration for the fund’s portfolio?


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Immunization –Balance sheet hedging based on duration

• Immunization is a hedging strategy based on duration

– designed to protect against interest rate risk.

• Match the value changes in both sides of balance sheet:

– The drop in the value of assets can be (partially) offset by the

drop in the value of liabilities.

• Immunization is accomplished by equating the interest rate

exposure of assets and liabilities

– Asset Duration × assets = Liability Duration × liabilities


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Example

• You have just learned that your firm has a future liability of $1 million

due at the end of two years. Suppose there are two different bonds

available and r = 10%.

• Duration of liability = 2 years

Bond 1: 7% annual coupon, T = 1 year, $1,000 par value;

P1 =

Duration (D1) = 1 year

Bond 2: 8% annual coupon, T = 3 years, $1,000 par value

P2 =

duration (D2) = 2.78 years after some calculation

E l ’d I i i i


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Example cont’d: Immunization strategies

• If:

– Buy bond 1 and then another 1-year bond after a year - runsrisk of lower rates available for second year - reinvestment risk

– Buy bond 2 and sell after 2 years - If rates rise before then,

bond prices fall, so investment may not be enough to cover

liability - price risk

• Invest in a combination of bonds 1 and 2 so that the exposure

to interest rate risk will be the same between assets (your

investment) and liability

– Basic idea: if rates rise, the portfolio’s losses on the 3 yearbonds will be offset by gains on reinvested 1 year bonds.

– And vice versa.

– How much should you invest in each bond?

E l ’d l i


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Example cont’d: solution

w1 % invested in 1 year bonds and (1 – w1) % in 3 year bonds.

w1 *D1 + (1 – w1 )D2 =

Total amount to be invested =

Amount in 1-year bonds =

Number of 1 year bonds =

Amount in 3 year bonds =

Number of 3 year bonds =


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Example cont’d: Does the immunization strategy work?

r after 1 year

9% 10% 11%

Value at t = 2 from reinvesting 1 year bond

proceeds:

$438,197 $442,181

Value at t = 2 of 3 year bonds:Value from reinvesting coupons received at t = 1

Coupons received at t = 2;

Selling price at t = 2;

$42,997

$39,088

$479,716

$43,388

$39,088

$475,395

Total $999,998 $1,000,052


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Immunization cont’d

• As can be seen from the table above, the immunization strategy appears

to perform fairly well• However, there are a number of assumptions needed for this to work.

Some possible problems include:

– the strategy assumes that there is no default risk or call risk for the bonds

in the portfolio

– The strategy assumes that the term structure is flat and any shifts in it are

parallel

– duration will change over time (even if r does not), so the manager may

have to rebalance the portfolio (note that there is a tradeoff of accuracy

from frequent rebalancing vs. transactions costs)

• More complicated strategies exist to handle these types of problems, but

immunization using duration is still a very widely used tool in practice


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Assigned questions # 26.1-5, 7-9, 12-14, 17

Derivatives and hedging risk

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