Problem 1
Part 1
The expected return of Yahoo is 12% with standard deviation of 20% and the expected return
of Google is 15% with standard deviation of 25%. The correlation coefficient of Yahoo and Google
is -1. What should be the risk free rate if there is no arbitrage opportunity?
Part 2:
Suppose that 1 year zero rate is 1% and 2 year zero rate is 2%. Consider a risk free bond with
maturity of two years and a face value of $100 that has an annual coupon rate of 3%. Let Y denote
the yield to maturity for this bond. Write down an equation whose solution provides you the yield to
maturity for the bond (you do not need to solve the equation). All rates including the yield are
continuously compounded.
1.
standard deviation of protfolio=weight of google*standard deviation of google - weight of yahoo*standard deviation of yahoo
risk free rate has standard deviation of zero
=>0=weight of google*standard deviation of google-weight ofyahoo*standard deviation of yahoo
=>weight of google*25%=weight of yahoo*20%
=>weight of google*25%=(1-weight of google)*20%
therefor, weight of google=0.444
weight of yahoo=0.556
hence, riskfree rate=4/9*15%+5/9*12%=13.33%
2.
3%*1000/1.01+3%*1000/1.02^2+1000/1.02^2=3%*1000/(1+ytm)+3%*1000/(1+ytm)^2+1000/(1+ytm)^2
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