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A money manager for a university endowment has received a $ 1 0 million donation to invest. The intent is to establish a cash flow
A money manager for a university endowment has received a $ million donation to
invest. The intent is to establish a cash flow stream for the next years. The goal is to
have an annual payout that begins at $ and grows by per year. The manager
has identified a list of different bonds to invest in The managers goal is to determine
which bonds to purchase now so as to maximize the total discounted return while
guaranteeing the bonds pay out the required annual funds. The manger has specified a
limit of units of any individual bond.
The data on tab lists the bonds available for purchase annual payout for each of the
next years. The data includes the payout each year based on the bonds coupon and
maturity date. The investment column contains a place to identify the number of bonds
purchased of each type.
First, complete the model.
Calculate the cash flow in each year as the sum product of the Investment
column and the appropriate bond cash flow column.
Calculate the cash flow required based on the Initial Cash Required and the
Annual Increase fields.
Calculate the Disc Cash Flow as the product of the Cash Flow and discount Factor
column.
Now specify the optimization model.
Define the Investment column as the decision variables.
Define the Disc Cash Flow as the Objective. max
Establish the constraint that the Cash Flow must exceed the Cash Required field.
Establish a constraint that limits the Investment to be less than the Available
Funds.
Constrain the Investments to be nonnegative integers and less than the Max per
Bond setting.
We wish to solve the model using the standard LP Quadratic engine to
guaranteed optimality tolerance
Set the engine to Standard LP Quadratic Do not have Automatically Select
Engine checked.
Now solve the model.
Create a graph of the Cash Flow per year and paste it into your template.
What is the total Disc Cash Flow?
How many bonds were invested in
Filter your data to show the bonds that were selected, including the number
purchased and the Bond characteristics. Paste this data into your template.
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