Consider an American call and an American put with the same underlying stock share S paying no dividend, the same strike price K = $30 and the same expiration date T = 3 (months). Suppose that the stock price is $31, the risk-free interest rate is 10% per annum compounded continuously, the price of the American call option is $3, and the price of the American put option is $1. Using the no-arbitrage principle, prove that there exists an arbitrage opportunity then.

Consider an American call and an American put with the same underlying stock share S paying no dividend, the same strike price K = $30 and the same expiration date T = 3 (months). Suppose that the stock price is $31, the risk-free interest rate is 10% per annum compounded continuously, the price of the American call option is $3, and the price of the American put option is $1. Using the no-arbitrage principle, prove that there exists an arbitrage opportunity then.

Intermediate Financial Management (MindTap Course List)

13th Edition

ISBN:9781337395083

Author:Eugene F. Brigham, Phillip R. Daves

Publisher:Eugene F. Brigham, Phillip R. Daves

Chapter5: Financial Options

Section: Chapter Questions

Problem 4P: Put–Call Parity The current price of a stock is $33, and the annual risk-free rate is 6%. A call...

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Put–Call Parity The current price of a stock is $33, and the annual risk-free rate is 6%. A call option with a strike price of $32 and with 1 year until expiration has a current value of $6.56. What is the value of a put option written on the stock with the same exercise price and expiration date as the call option?
Suppose that a stock price is currently 51 dollars, and it is known that one month from now, the price will be either 6 percent higher or 6 percent lower. Find the value of an American call option on the stock that expires one month from now, and has a strike price of 49 dollars. Assume that no arbitrage opportunities exist, and a risk free interest rate of 10 percent
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Consider a European put and a European call option which are both written on a non-dividend paying stock, have the same strike price K = £80 and expire in T = 2 months. These options are trading for p = £21 and c = £30.80, respectively. The underlying stock price is S0 = £90. The continuously compounded risk-free rate of interest is r = 10% per annum. What is the present value of the arbitrage profit? Please explain your answer and show your workings. In your response, please show all cash flows (both today and at expiration) and explain why this is an arbitrage (i.e. risk-less) profit.
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