The mainstream neoclassical economic theory assumes a binary model of levels of the economic hierarchy: macro and microeconomic levels. However, the idea of distinguishing the intermediate level of the economic hierarchy, the mesolevel, understood as a certain space for the transition of rules of interaction between individual economic individuals to the formation of full-fledged economic institutions and as an "intermediate link between individual actors and organizations at the micro level and systems of social and transsocial actors at the macrolevel" (Scott, 2008, p. 191). Despite a relatively long-standing origin, mesoeconomic theory has not yet been widely recognized in the scientific economic environment, but it has its supporters. Representatives of economic doctrines readily turn to the mesolevel of research, among them, first of all, are the supporters of evolutionary and institutional economic theories. In this paper, we aimed to analyze the main English language work on mesoeconomic research, and also show the key directions applying in mesoeconomic theory in economic research, the main ones of which seem to be institutional and evolutionary economic theories, since it is the mesolevel that can become a necessary object of research for supporters of both economic theories. Exactly for these groups of economists mesolevel is increasingly becoming a necessary study object. Within the framework of the proposed article, we will give a brief analysis of theoretical papers devoted to mesoeconomic research.