Problem
In a financial market a stock is traded with a current price of 50. Next period the price of the stock can either go up with 30 per cent or go down with 25 per cent. Risk-free debt is available with an interest rate of 8 per cent. Also traded are European options on the stock with an exercise price of 45 and a time to maturity of 1, i.e. they mature next period.
a) Find prices of Arrow-Debreu securities.
b) Calculate the price of a call option by constructing and pricing a replicating portfolio.