Resumen en español

The way in which a company finances itself is named the capital structure. Actually, the capital structure talks about the proportion of debt financing that the company has and their leverage rate. The capital structure election is a simple compensatory interchange risk-yield. A critical aspect of the capital structure is to answer the question if this affects the company value. Capital structure is not a static result; it varies in time, with base in the fluctuations of the external and inner variables affecting an economic sector or a company, and even, they can change with the expectations of growth held. This paper firstly reviews the existing theory in the capital structure field, then designs a model with a clear methodology that can be found from a minimum cost and a maximum value from the company point of view to determine an optimum composition of the capital structure.