STAT$473.$Homework$6$Solutions.$ Spring2015.$ Word - 473S15HW6_Sol.docx Created Date 4/15/2015...
Transcript of STAT$473.$Homework$6$Solutions.$ Spring2015.$ Word - 473S15HW6_Sol.docx Created Date 4/15/2015...
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STAT 473. Homework 6 Solutions. Spring 2015. Problem 1. (i)
(ii)
(iii) We expect that the premium of the call will increase 0.36 dollars if the stock price increases 50 cents. Similarly, we will expect that the premium of the option will increase by 7.8582% if the stock price increases by 2%. (iv)
(v)
(vi)
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(vii)
(viii) The Sharpe ratio of the call coincides with the Sharpe ration of the stock, which is then given by (alpha-‐r)/sigma=(0.1-‐0.08)/0.3=0.066. Problem 2. The idea is to use the fundamental formula: γ − r =Ω α − r( ) We know gamma from (vi). The Key formula to use here to find α is ST = S0e
σ TZ+(α−δ−σ 2 /2)T Then, in the Black-‐Scholes Framework, the instantaneous rate of return
€
ln(S1 /S0) is Normal distributed with mean α − δ − σ
2/ 2 and variance
€
σ2.
Thus,
€
σ2
= 0.14 and α − δ − σ2/ 2 = 0.09 , from which we obtained that α = 0.19 .
Now, to find the elasticity, we first use that the replicating portfolio is 0.4, which coincides with the Delta. Then, Ω = SΔ / P = 50(−0.4) / 5= −4 Therefore, −0.62− r = (−4) −.19− r( ) , from which we can find easily r.
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Problem 3.
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Problem 4.
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Problem 5.
Problem 6.
Summary of answers from the previous tables:
(a) Need to buy 0.2 extra shares on day 1 to maintain the delta hedge. (b) Cumulative cost = -‐27.502. (c) M-‐to-‐M P/L on day 2 = -‐0.905.
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Problem 7.