PL
Key words: structure of capital, model M-m, costs of financial difficulties,theory of the substitution, theory of source of finances, theoryof signalsSummaryThe problem of the forming of the relation between acquired sourceof finances is one from leading in the activity of companies. The article is describing few examples of the rich theoretical possessionsconcerning the structure of capital which the determination is facilitatingunderstanding reports which constantly are occurring amongall sorts economic categories in the company, stimulating effects offunctioning.