||thesis describes effects of corporate governance on firm performance and managerial income of firms from sectors important for Czech GDP: financial sector and export-oriented manufacturing industries. Added value of the work comes mostly from the fact that it concerns Czech firms and especially that it studies the two sectors using econometric method as well as it compares them on graphs and tables. There are two main topics for hypotheses testing. Firstly, the thesis investigates effects on firm performance, measured by proxy variable return on equity, by sizes of executive boards and firms. Secondly, the effects of performance as well as companies and boards sizes on managerial income are studied.