This master’s thesis deals with influence of private equity on companies’ economics. First part describes term of private equity and defines theoretical bases of financial analysis. Next part introduces selected companies influenced by private equity. Final part is aimed at evaluation venture capital’s influence and judgment of companies’ economics development.

The objective of the research reported in this dissertation is to conduct an empirical test of the hypothesis that, excluding income tax effects, the cost of capital to a firm is independent of the degree of financial leverage employed by the firm. This hypothesis, set forth by Franco Modigliani and Merton Miller in 1958, represents a challenge to the traditional view on the subject, a challenge which carries implications of considerable importance in the field of finance. The challenge has led to a lengthy controversy which can ultimately be resolved only by subjecting the hypothesis to empirical test. The basis of the test was Modigliani and Miller's Proposition II, a corollary of their fundamental hypothesis. Proposition II, in effect, states that equity investors fully discount any increase in risk due to financial leverage so that there is no possibility for the firm to reduce its cost of capital by employing financial leverage. The results of the research reported in this dissertation do not support that contention. The study indicates that, if equity investors require any increase in premium for increasing financial leverage, the premium required is significantly less than that predicted by the Modigliani-Miller Proposition II, over the range of debt-equity ratios covered by this study. The conclusion, then, is that it is possible for a firm to reduce its cost of capital by employing financial leverage. A secondary conclusion that can be drawn from this study is that earning power is an important variable to consider for inclusion in a regression model intended for use in investigating the effect of financial leverage on the cost of capital. The estimated partial regression coefficient of the earning-power variable was negative and highly significant in every cross-section year. Furthermore, earning power showed strong negative partial correlation with the debt-equity ratio. Therefore, omission of the earning-power variable from the regression model would have introduced upward bias into the estimated regression coefficient of the debt-equity ratio, making it appear that investors were reacting adversely to increasing debt-equity ratio. However, models used in previous tests of the Modigliani-Miller hypothesis have not included earning power.