Question

In: Finance

A stock has a beginning market value of $75. It can either increase in value 15%...

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]

Solutions

Expert Solution

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

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