Suppose the SPY index will either go up 10% or down 10% by the end of next week.  In addition, you know that the probability of either case occurring is 50%. The index currently sells for $320. Take these details as facts. An associate at your firm (call him trader A) argues that a bull market is on its way, and that there is in fact a 70% chance of the 10% increase, and a 30% chance of a 10% decrease. A second associate (call him trader B) argues that a bear market is on its way, and that the probabilities are just the opposite; a 30% chance of the 10% increase, and a 70% chance of a 10% decrease. Both traders are willing to buy and sell at a price equal to their own expected value of the stock price. You have $320 for investment. How much money can you make on a quick arbitrage trade?

EBK CONTEMPORARY FINANCIAL MANAGEMENT
14th Edition
ISBN:9781337514835
Author:MOYER
Publisher:MOYER
Chapter8: Analysis Of Risk And Return
Section: Chapter Questions
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Suppose the SPY index will either go up 10% or down 10% by the end of next week.  In addition, you know that the probability of either case occurring is 50%. The index currently sells for $320. Take these details as facts.

  • An associate at your firm (call him trader A) argues that a bull market is on its way, and that there is in fact a 70% chance of the 10% increase, and a 30% chance of a 10% decrease.
  • A second associate (call him trader B) argues that a bear market is on its way, and that the probabilities are just the opposite; a 30% chance of the 10% increase, and a 70% chance of a 10% decrease.

Both traders are willing to buy and sell at a price equal to their own expected value of the stock price. You have $320 for investment. How much money can you make on a quick arbitrage trade?

 

 

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