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# Mean-variance efficient frontiers

Mean-variance efficient frontiers.

1. (2 points). Mean-variance efficient frontiers. There are two risky assets A and B. The means
and standard deviations of the assets’ returns are given by
Mean �” Standard Deviation �”
A 5% 10%
B 8% 15%
a. Write the equations for the mean-variance efficient frontiers when the correlation between
the two assets is -1, 0, and 1. Graph the efficient frontiers with the standard deviation on
the x axis and the mean on the y axis using your preferred graphing software. Note that
the efficient frontiers are only the regions of the feasible sets that provide the maximum
mean return for any given standard deviation. You will lose 1 point if you do not distinguish
the efficient frontier from the set of feasible mean-standard deviation combinations.
b. Consider the case where the correlation between the two assets is zero. What is the
standard deviation of asset A above which no portfolio on the mean-variance efficient
frontier includes a positive amount of asset A in the portfolio? Show your work.
2. (2 points). Consumption CAPM. Assume utility is of the quadratic form �(�) = �� − +
,
�,
and a representative investor chooses a portfolio to solve the two-period utility maximization
problem
max�(�0) + 3��”�(�6

)
7
“8”
�.�. �0 + 3�”�6

7
“86
= �0
where the terms are defined as in class lecture 11. Assume all C’s are low enough that marginal
utility is positive. Let g = (C1-C0)/C0, the growth in consumption. Let �̃
portfolio that is uncorrelated with �A.
B, equals the sum of the
expected return of �̃
0 plus the beta from a regression of the portfolio return on consumption
growth times some constant Z:
�[�̃
B] = �[�̃
0] + �G
B�
Where
�G
B = ���(�̃
B, �A)
���(�A)
Useful facts: For any constants d, f, and h and random variables v and w
���(��A, �O) = ����(�A, �O) ��� ���(�A + �, �O + ℎ) = ���(�A, �O)
3. (2 points). Fundamental Theorem of Asset Pricing. Using the notation from class lecture 12,
prove that there can be no arbitrage opportunities if there exists a risk-neutral probability
measure on the set of fundamental securities.

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Mean-variance efficient frontiers

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