PL
Po oszacowaniu funkcji dochodowej, przy przyjęciu jako zmiennych niezależnych ziemi, pracy i kapitału, a następnie dokonaniu jej przekształceń, ustalono rentowność wybranych technik wytwarzania oraz wyliczono krańcowe stopy substytucji pracy kapitałem.
EN
The objective of the paper was to evaluate the profitability of capital for labour substitution in farms of size 407100 ESU and farms of size 7100 ESU. The Cobb-Douglas function was used in the research to analyze the competitiveness of production factors. The results of conducted analysis proved that the estimated profitability of production methods in the average farm of size 407100 ESU was lower than the profitability of farms of size 7100 ESU. The main reason for heterogeneity of production methods profitability was the different level of marginal rate of substitution. In light of the present circumstances, capital for labour substitution leads to the growth offarms' income. The higher level of farm’s income, the better conditions for self- financing of its growth.