Consider a perpetual put option with S = $50, K = $60, r = 0.06, =

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Consider a perpetual put option with S = $50, K = $60, r = 0.06, σ = 0.40, and δ = 0.03.
a. What is the price of the option and at what stock price should it be exercised?
b. Suppose δ = 0.04 with all other inputs the same. What happens to the price and exercise barrier? Why?
c. Suppose r = 0.07 with all other inputs the same. What happens to the price and exercise barrier? Why?
d. Suppose σ = 50% with all other inputs the same. What happens to the price and exercise barrier? Why?
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Derivatives Markets

ISBN: 978-0321543080

4th edition

Authors: Rober L. Macdonald

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