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Fura Barbara (University of Rzeszów, Poland), Fura Marek (Marshal Office of the Podkarpackie Region)
Optimization of Consumer Preferences - an Example
Didactics of Mathematics, 2015, nr 12 (16), s. 61-68, rys., bibliogr. 11 poz.
Teoria wyboru, Preferencje konsumenta, Mnożniki Lagrange'a
Choice theory, Consumer preferences, Lagrange multiplier
In the article we discuss a standard example of an optimization problem. In our problem we are optimizing the objective function, i.e. a consumer utility function with two variables representing quantities of two commodities denoted by x1 and x2. We consider the standard optimization problem in which we maximize the defined utility function subject to a budget constraint. More precisely, the problem is to choose quantities of two commodities 1st and 2nd, in order to maximize u(x1, x2) function subject to the budget constraint. The aim of the article is to present how we can exemplify and solve this kind of problems in a classroom. In the paper we suggest four methods of finding the solution. The first one is based on the graphical interpretation of the problem. Based on this we can get the approximate solution of the defined optimization problem. Then, we present an algebraic approach to find the optimum solution of the given problem. In the first method we use the budget constraint to transform the utility function of two variables into the function of one variable. The second algebraic method of achieving the solution is based on the second Goosen's law, which is known as the law of marginal utility theory. In the third algebraic method applied to find the maximum of the utility function, we use the Lagrange multipliers. The text emphasizes the educational aspect of the theory of consumer choice.(original abstract)
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