Portfolio Optimization Using Linear Programming: A Case Study

QUESTION

A brokerage firm has been tasked with investing $500,000 for a new client.
The client has asked that the broker select promising stocks and bonds for
investment, subject to the following guidelines:
– At least 20% in municipal bonds
– At least 10% each in real estate stock and pharmaceutical stock
– At least 40% in a combination of energy and domestic automobile
stocks, with each accounting for at least 15%
– No more than 50% of the total amount invested in energy and automobile
stocks in a combination of real estate and pharmaceutical company stock
Subject to these constraints, the client’s goal is to maximize projected
return on investments. The broker has prepared a list of high-quality stocks
and bonds and their corresponding rates of return, as shown in the following
table.
Investment Annual Rate of Return
City of Miami (municipal) bonds  5.3%
American Smart Car  8.8%
GreenEarth Energy  4.9%
Rosslyn Pharmaceuticals  8.4%
RealCo (real estate) 10.4%
Formulate this portfolio selection problem by using LP and solve it by using
Excel.

ANSWER

Portfolio Optimization Using Linear Programming: A Case Study

Introduction

In the world of finance, investment decisions play a crucial role in determining the success of both individuals and organizations. An essential aspect of this process involves portfolio management, where investment options are carefully selected to maximize returns while considering various constraints. This essay delves into a real-world scenario where a brokerage firm is tasked with investing $500,000 for a new client. By formulating the problem as a Linear Programming (LP) model and leveraging Excel’s capabilities, we aim to optimize the portfolio selection process to achieve the client’s goals while maximizing projected returns.

Problem Description

The brokerage firm’s client has provided specific investment guidelines to the broker. The main objectives are to allocate funds among different types of assets, such as municipal bonds, stocks in real estate, pharmaceuticals, energy, and domestic automobile sectors. The client aims to achieve a portfolio that adheres to these guidelines while maximizing the expected return on investment.

Linear Programming Formulation: Linear Programming is a mathematical optimization technique that helps solve problems with linear constraints and linear objective functions. In this case, the objective is to maximize the total return on investment, and the constraints are the allocation requirements provided by the client.

Let’s define the decision variables

Let x1 be the investment in municipal bonds

Let x2 be the investment in real estate stock

Let x3 be the investment in pharmaceutical stock

Let x4 be the investment in energy stocks

Let x5 be the investment in domestic automobile stocks

The objective function to maximize the total return can be expressed as: Maximize: 0.053x1 + 0.104x2 + 0.084x3 + 0.049x4 + 0.088*x5

Subject to the following constraints

Investment constraints: x1 + x2 + x3 + x4 + x5 = $500,000

Minimum allocation constraints: x1 >= 0.20 * ($500,000) x2 >= 0.10 * ($500,000) x3 >= 0.10 * ($500,000) x4 >= 0.15 * ($500,000) x5 >= 0.15 * ($500,000)

Maximum allocation constraints: x2 + x3 <= 0.50 * (x4 + x5)

Non-negativity constraints: x1, x2, x3, x4, x5 >= 0

Solving the Problem Using Excel

Excel provides powerful tools for solving optimization problems, including linear programming. By setting up the decision variables, objective function, and constraints as described above, you can utilize Excel’s Solver add-in to find the optimal solution that maximizes the expected return while meeting the client’s requirements.

Conclusion

Portfolio optimization is a critical aspect of investment decision-making, especially when faced with multiple asset types and constraints. By formulating the brokerage firm’s problem as a Linear Programming model and using Excel’s Solver, the client’s investment portfolio can be efficiently optimized to achieve the desired goals. This approach not only helps in maximizing projected returns but also ensures that the client’s specific preferences and investment guidelines are met. As the financial landscape continues to evolve, techniques like Linear Programming remain valuable tools for making informed investment decisions.

 

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