Notes for Lecture 2 (February 7)


 Mildred Bailey
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1 CONTINUOUS COMPOUNDING Invest $1 for one year at interest rate r. Annual compounding: you get $(1+r). Semiannual compounding: you get $(1 + (r/2)) 2. Continuous compounding: you get $e r. Invest $1 for T years at interest rate r. Annual compounding: you get $(1+r) T. Semiannual compounding: you get $(1 + (r/2)) 2T. Continuous compounding: you get $e rt. Invest $S for T years at interest rate r. Annual compounding: you get $S(1+r) T. Semiannual compounding: you get $S(1 + (r/2)) 2T. Continuous compounding: you get $Se rt. Mathematical notes: e = e r = lim n (1 + (r/n)) n When r is close to zero, e r 1+r. e 0 = 1 e r e s = e r+s e r e r = e 0 = 1 (e r ) T = e rt 1
2 CONVERTING BETWEEN CONTINUOUS AND ANNUAL Ae rt = A(1+R) T e rt = (1+R) T e r = 1+R r = ln(1+r) R = e r 1 CONVERTING BETWEEN CONTINUOUS AND m TIMES PER ANNUM Ae rt = A(1+ m R m ) mt e r = (1+ m R m ) m r = m ln(1+ m R m ) R m = m( e m r 1) 2
3 FORWARD PRICE WITH CONTINUOUS COMPOUNDING F 0 = S 0 e rt If F 0 > S 0 e rt or F 0 < S 0 e rt, then an arbitrageur can make money. F 0 > S 0 e rt Borrow $S 0. Spend the $S 0 to buy an ounce of gold. Go short in a forward contract (agree to sell one ounce for $F 0 after T years). Sell the gold for $F 0. Pay off the loan with $S 0 e rt. Profit: $(F 0 S 0 e rt ) F 0 < S 0 e rt Borrow an ounce of gold from Joe. Sell the ounce of gold for $S 0 and put the $S 0 in the bank. Go long in a forward contract (agree to buy one ounce for $F 0 after T years). Buy an ounce of gold for $F 0 and return it to Joe. Collect $S 0 e rt from the bank. Profit: $(S 0 e rt F 0 ) If you are holding gold for speculation, you can do this without finding someone else to borrow the gold from. 3
4 FORWARD PRICE OF ASSET WITH KNOWN INCOME Say the asset is a bond with coupons that have present value I. F 0 = (S 0 I)e rt If F 0 > (S 0 I)e rt or F 0 < (S 0 I)e rt, then an arbitrageur can make money. F 0 > (S 0 I)e rt Borrow $S 0 Spend the $S 0 to buy the bond. Go short in a forward contract (agree to sell the bond for $F 0 after T years). Collect income of Ie rt from the bond. Sell the bond for $F 0. Pay off the loan with $S 0 e rt. Profit: $(F 0 + Ie rt S 0 e rt ) F 0 < (S 0 I)e rt Borrow the bond from Joe (& pay him $I for the coupons). Sell the bond for $S 0 and put $(S 0 I) in the bank. Go long in a forward contract (agree to buy the bond for $F 0 after T years). Buy the bond for $F 0 and return it to Joe. Collect $(S 0 I)e rt from the bank. Profit: $[(S 0 I)e rt F 0 ] 4
5 FORWARD PRICE OF ASSET WITH KNOWN DIVIDEND YIELD Say a stock that pays continuous dividends at rate q. F 0 = S 0 e (rq)t If F 0 > S 0 e (rq)t or F 0 < S 0 e (rq)t, then an arbitrageur can make money. F 0 > S 0 e (rq)t Borrow $S 0. Spend the $S 0 to buy one share. Go short in a forward contract on e qt shares. (agree to sell e qt shares for $F 0 per share after T years). During the next T years: Reinvest all dividends in the stock. Sell e qt shares for $F 0 e qt. Pay off the loan with $S 0 e rt. Profit: $(F 0 e qt S 0 e rt ) F 0 < S 0 e (rq)t Borrow a share from Joe. Sell the share for $S 0 and put the $S 0 in the bank. Go long in a forward contract on e qt shares (agree to buy e qt shares for $F 0 per share after T years). During the next T years: Continue to go short in the stock to pay Joe his dividends. Buy e qt shares for $F 0 e qt and return them to Joe. Collect $S 0 e rt from the bank. Profit: $(S 0 e rt F 0 e qt ) 5
6 We must distinguish between the value of a forward contract and the forward price. value = the price you should pay for the forward contract delivery price = the price the contract requires you to pay at maturity forward price = the delivery price of a forward contract negotiated today (fixed so that the value is zero) Example: The delivery price of a forward that was negotiated yesterday is yesterday s forward price. f = value of contract today K = delivery price of contract F = (today s) forward price f = (F 0 K)e rt 6
7 VALUE OF OLD FORWARD WITH DELIVERY PRICE K f = (F 0 K)e rt If f > (F 0 K)e rt or f < (F 0 K)e rt, then an arbitrageur can make money. f > (F 0 K)e rt Sell one old forward (delivery price K). (agree to sell one unit for $K after T years). Put the proceeds ($f) in the bank. Go long in one new forward (delivery price F 0 ). (agree to buy one unit for $F 0 after T years). Collect fe rt from the bank. Buy one unit for $F 0 and sell it for $K. Profit: $[fe rt F 0 + K] f < (F 0 K)e rt Borrow $f. Buy old forward (delivery price K). (agree to buy one unit for $K after T years). Go short in one new forward (delivery price F 0 ). (agree to sell one unit for $F 0 after T years). Pay the bank $fe rt. Buy one unit for $K and sell it for $F 0. Profit: $[F 0 K fe rt ] 7
8 SUMMARY (page 77) Asset Provides no income Provides known income with present value I Provides known dividend yield q Value of long forward contract with delivery price K f = (F 0 K)e rt = F 0 e rt Ke rt S 0 Ke rt S 0 I Ke rt S 0 e qt Ke rt Forward price F 0 S 0 e rt (S 0 I)e rt S 0 e (rq)t 8
9 Investment vs Consumption Commodities Forward Price F 0 Spot Price S 0 Asset Investment Commodity Consumption Commodity Provides no income F 0 = S 0 e rt F 0 S 0 e rt Provides known income with F 0 = (S 0 I)e rt F 0 (S 0 I)e rt present value I Provides known dividend yield q F 0 = S 0 e (rq)t F 0 S 0 e (rq)t Storage cost is treated as negative income. Storage cost with present value U F 0 = (S 0 + U)e rt F 0 (S 0 + U)e rt Storage cost at rate u F 0 = S 0 e (r+u)t F 0 S 0 e (r+u)t You can have both income and storage: Storage cost u and income q F 0 = S 0 e (r+uq)t F 0 S 0 e (r+uq)t Cost of Carry = interest + storage income = r + u q = c: Cost of carry c F 0 = S 0 e ct F 0 S 0 e ct When F 0 S 0 e ct, the y such that F 0 = S 0 e ct is called the convenience yield. 9
10 Hierarchy of arguments: Strongest: arguments based on exact arbitrage Strong: arguments based on approximate arbitrage (if you don t take too large a position and there is not a lot of other money taking the same position) Doubtful: any argument based on the assumption that market prices are expected values with respect to a probability distribution Very doubtful: any argument based on CAPM Recall that CAPM says that the expected return R p on a portfolio p with beta β will obey R p R f β(r m R f ). Problems: The model is not well supported empirically. β may not be known (i.e., the historical data may not predict the future) Even if the model is right and β is known, the relation is only approximate, and the noise may be large. 10
11 Hedging using index futures: In theory, you can hedge a portfolio of stocks with a known beta β by going short in βp/a future contracts, where P is the dollar value of the portfolio, and A is the dollar value of the asset underlying one futures contract. This should convert the portfolio s return over the period of the hedge into the return on a risk free bond. Problem 3.32 P = $50 million β = 0.87 Hedge with S&P500 futures. Each contract is 250 times the index. The current value of the index is So the dollar value of the asset underlying the contract is $1250x250 = $312,500. The manager wants to hedge for 2 months, using futures with maturity of 3 months. βp/a = 0.87 x 50,000,000 / 312, So short 139 contracts. We assume that the dividend yield on the S&P500 is q = 0.03 and the riskfree rate is r =0.06. The theoretical futures price now is S 0 e (rq)t, and T = 0.25 (three months). The futures price two months from now depends on the value of the index then. 11
12 Problem 3.32 P = $50 million β = 0.87 Hedge with S&P500 futures. Each contract is 250 times the index. The current value of the index is So the dollar value of the asset underlying the contract is $1250x250 = $312,500. The manager wants to hedge for 2 months, using futures with maturity of 3 months. βp/a = 0.87 x 50,000,000 / 312, So short 139 contracts. We assume that the dividend yield on the S&P500 is q = 0.03 and the riskfree rate is r =0.06. The theoretical futures price now is S 0 e (rq)t = 1250e ( )0.25 = The futures price two months from now depends on the value of the index then. If the index is at 1,000 two months from now, then the futures price will be 1,000e (rq)t with T = 1 month = : S 0 e (rq)t = 1000e ( ) = So the gain on the short position will be ( ) x 250 x 139 = $8,927,530. The index drop indicates a capital loss of 250/1250 = 20% by the market, offset by a 0.5% dividend (two months at 3% per annum), for a net return of 19.5%. This is less than the riskfree rate of 1% by 20.5%. CAPM says that the portfolio should be less than the riskfree rate of 1% by 0.87 x 20.5% = %. In other words, it should have a return of 16,835%, or a loss of x 50,000 = $8,417,500. So the manager records a net gain of $8,927,530  $8,417,500= $510,030. The problem requires that you make a similar computation for other assumptions about the change in the value of the index. 12
13 Problem Continuously compounded rates: Riskfree Storage cost for gold: Bank s rate for cash loan: Bank s rate for gold loan The interest on gold is paid in gold: if you borrow 1 ounce for one year, you must pay back 1.02 ounces. Dicuss how the bank s interest rate for gold compares with its interest rate for cash. Hints: The bank compensates itself for default risk and administrative costs by charging more than the riskfree rate for loaning cash. How much is the premium? How much is its premium for lending gold, taking into account the storage cost that it saves itself by loaning the gold? 13
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