The task of a sustainable economic growth is impossible without considering the quality of labour factor. To consider it in a very simple way means to distinguish qualified and unqualified labour. The purpose of this report is to build a mathematical model of the dynamics of volumes of skilled and unskilled labour types. The main idea of the model consists in ascertaining the fact that any enterprise (an economic unit) tends to shorten the disbalance between mentioned above types of labour when this disbalance occurs. As this happens in a huge number of cases, then there is no point in considering each case separately. In this work, the algorithm to estimate a conditional balance (a synergetic balance) between these groups of labour in macroeconomic aspect is offered. The balance uncertainty is formed by different technological conditions of enterprises, dissimilar provision of labour groups in regions, different educational structures, nonstationarity of demography and other socio-economic factors. The statistical observations for the considered correlation are not conducted fully. However, production functions with different contribution of different labour groups appear in the scientific publication. So the mathematical modelling of the dynamics of these groups' volumes is of current importance. (C) 2019 Published by Future Academy www.FutureAcademy.org.UK