The purpose of the article is to develop a methodological approach for assessment of the marginal product of labour in agricultural enterprises by constructing a production function, as well as determine efficiency for labour pricing in agricultural enterprises in Ukraine on basis of revealing correspondence between value for the marginal product of labour and payments for labour use.  Research methods. The methodological basis of the research is the principles of classical and neoclassical economic theory. In particular, the following scientific methods have been used: analysis and synthesis for determining a criterion of efficiency for pricing; empirical studies for collection of data on used resources and production results of enterprises; index for calculation real indicators and determination their changes; comparison for comparing value for the marginal product of labour and costs of labour use or dynamic changes; correlation analysis for study density of the relationship between variable models; economic-mathematical modelling and regression analysis for construction of a production function; logical generalizations for formulating conclusions. Research results. Methodical peculiarities for determination of production results for constructing a production function of agricultural enterprises for a purpose of evaluation of labour and capital inputs in value added have been developed. Estimates of the marginal product of labour in agricultural enterprises of Ukraine on basis of survey in selected agricultural enterprises, as well the data analysis of their statistical and financial reports, have been done. There has been found a gap between the value of marginal product of labour and payments for labour use. The revealed existence of such gap and discovered macroeconomic tendencies gave grounds to conclude on inefficiency of labour pricing in agriculture in Ukraine, which causes negative tendencies in the development of resources potential, and generates threats to the sustainable development of the economy.  Elements of scientific novelty. A methodical approach to calculation of the marginal product of labour of agricultural enterprises based on the production function has been developed. Estimates of value of the marginal product of labour and its comparison with the costs of labour use in agricultural enterprises in Ukraine have been done. Practical significance. The proposed approach to estimate value of the marginal product of labour can be used to assess efficiency of labour pricing, to improve the technology of motivation of hired workers at agricultural enterprises, increase their labour productivity. Tabl.: 3. Figs.: 1. Refs.: 23