期权期货和其他衍生品 约翰赫尔第九版 习题答案.pdf

CHAPTER 1 Introduction Practice Questions Problem 1.1. What is the difference between a long forward position and a short forward position? When a trader enters into a long forward contract, she is agreeing to buy the underlying asset for a certain price at a certain time in the future. When a trader enters into a short forward contract, she is agreeing to sell the underlying asset for a certain price at a certain time in the future. Problem 1.2. Explain carefully the difference between hedging, speculation, and arbitrage. A trader is hedging when she has an exposure to the price of an asset and takes a position in a derivative to offset the exposure. In a speculation the trader has no exposure to offset. She is betting on the future movements in the price of the asset. Arbitrage involves taking a position in two or more different markets to lock in a profit. Problem 1.3. What is the difference between entering into a long forward contract when the forward price is $50 and taking a long position in a call option with a strike price of $50? In the first case the trader is obligated to buy the asset for $50. (The trader does not have a choice.) In the second case the trader has an option to buy the asset for $50. (The trader does not have to exercise the option.) Problem 1.4. Explain carefully the difference between selling a call option and buying a put option. Selling a call option involves giving someone else the right to buy an asset from you. It gives you a payoff of max(S K0) min(K S 0) T T Buying a put option involves buying an option from someone else. It gives a payoff of max(K S 0) T In both cases the pote