In: Finance
A stock has a beginning market value of $75. It can either increase in value 15% each year or decrease in value by 15%. A 3-year European call option written on the stock has an exercise price of $75. The risk-free rate of return is 5% per year. What is the current equilibrium price of the call option if you maintain a riskless portfolio by readjusting your relative positions in stocks and puts at the end of each year?
X=75
Payoff of call at t=3 is max [0,St-X]
Inputs | ||
Strike or Exercise price* | 75 | |
Current Stock Price* | 75 | |
Risk free interest rate* | 0.05 | |
Percentage Rise of Stock* | 0.15 | |
Percentage Fall of Stock* | -0.15 | |
Outputs | ||
Stock Price at Maturity (Rise) | =K5+K5*K7 | 86.25 |
Stock Price at Maturity (Fall) | =K5+K5*K8 | 63.75 |
Put Option Price at Maturity (Rise) | =MAX(K4-K11,0) | 0 |
Put Option Price at Maturity (Fall) | =MAX(K4-K12,0) | 11.25 |
Portfolio Replication | ||
=(K13-K14)/(K11-K12) | -0.5 | |
=(K14-K16*K12)/(1+K6) | 41.0714285714286 | |
Put Option Price now | =K16*K5+K17 | 3.57142857142857 |
Put option Price = 3.571287
Now as mentioned in the problem we'll use the put call parity to
arrive at the call price =$ 13.78
Number of Periods to Expiration* | 3.00 | ||||
Strike or Exercise price* | $75.00 | ||||
Stock Price* | $75.00 | ||||
Call Price* | $0.00 | ||||
Put Price* | $3.57 | ||||
Interest rate per Period* | 5.00% | ||||
Leave the unknown variable as 0 above for calculation below. Only 1 unknown variable at one time is supported. | |||||
Outputs | |||||
Stock Price + Put Price = Present value of Strike price + Call Price | |||||
Stock Price | $75.00 | ||||
Put Price | $3.57 | ||||
Present value of Stike price | 64.78781989 | ||||
Call Price | $13.78 |