Daniel Grady is the financial advisor for a number of professional athletes. An analysis of the long-term goals for many of these athletes has resulted in a recommendation to purchase stocks with some of the income that they have set aside for investments. Five stocks have been identified as hav- ing very favorable expectations for future performance. Although the expected return is important in these investments, the risk, as measured by the beta of the stock, is also important. (A high value of beta indicates that the stock has a relatively high risk.) The expected return and the beta for five stocks are as follows:   Stock 1 2 3 4 5 Expected Return (%) 11.0 9.0 6.5 15.0 13.0 Beta 1.20 0.85 0.55 1.40 1.25 Daniel would like to minimize the beta of the stock portfolio (calculated using a weighted average of the amounts put into the different stocks) while maintaining an expected return of at least 11%. Since future conditions may change, Daniel has decided that no more than 35% of the portfolio should be invested in any one stock. (a) Formulate this as a linear program. (Hint: Define each variables as the proportion of the total investment that would be put in that stock. Include a constraint that restricts the sum of these vari- ables to be 1.) (b) Solve this problem. What are the expected return and beta for this portfolio?

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter9: Decision Making Under Uncertainty
Section9.4: The Precision Tree Add-in
Problem 9P
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Daniel Grady is the
financial advisor for a number of professional athletes.
An analysis of the long-term goals for many of these
athletes has resulted in a recommendation to purchase
stocks with some of the income that they have set aside

for investments. Five stocks have been identified as hav-
ing very favorable expectations for future performance.

Although the expected return is important in these
investments, the risk, as measured by the beta of the

stock, is also important. (A high value of beta indicates
that the stock has a relatively high risk.) The expected
return and the beta for five stocks are as follows:

 

Stock 1 2 3 4 5
Expected Return (%) 11.0 9.0 6.5 15.0 13.0
Beta 1.20 0.85 0.55 1.40 1.25


Daniel would like to minimize the beta of the stock
portfolio (calculated using a weighted average of
the amounts put into the different stocks) while
maintaining an expected return of at least 11%.
Since future conditions may change, Daniel has
decided that no more than 35% of the portfolio
should be invested in any one stock.
(a) Formulate this as a linear program. (Hint: Define
each variables as the proportion of the total
investment that would be put in that stock. Include

a constraint that restricts the sum of these vari-
ables to be 1.)

(b) Solve this problem. What are the expected return
and beta for this portfolio?

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