Mesoeconomics or Mezzoeconomics is a neologism used to describe the study of economic arrangements which are not based either on the microeconomics of buying and selling and supply and demand, nor on the macroeconomic reasoning of aggregate totals of demand, but on the importance of the structures under which these forces play out, and how to measure these effects. Mesoeconomics, as a science, began to take shape back in the 19th century. Among the researchers, the most notable contribution to the development of problems of regional economic theory, issues of the location of production forces and the efficiency of regional production was made by German economists - Johann Heinrich Thünen, Alfred Weber, Walter Kristaller, August Lesch, professor of economics at the University of Pennsylvania Walter Isard, French economist Jean Chardonnay, American economist of Russian origin Vasily Leontiev, V. Thompson, T. Palander, as well as the authors of the famous textbooks H. Armstrong and J. Taylor. Among Soviet researchers of the first half of the 20th century, G.M. Krzhizhanovsky, I.G. Alexandrova, V.V. Kuibyshev, N.N. Nasrudin Nasri, who dealt with long-term planning and economic zoning. Among the Russian scientists of the second half of the 20th century, research in the field of regional distribution, the creation of territorial production complexes and the efficiency of regional production: T.S. Khachaturova, Ya.G. Feigina, N.N. Nekrasov, A.G. Granberg, P.M. Alampieva, E.B. Alaeva, K.N. Bedrintseva, G.I. Granik, F.D. Zastavny, R.S. Livshits, K.I. Klimenko, Yu.K. Kozlova, A.M. Korneeva, V.V. Kistanova, A.G. Omarovsky, N.N. Oznobina, V.F. Pavlenko, M.M. Palamarchuk, Yu.G. Saushkina, E. D. Silaeva, N.I. Shraga and V.M. Torosov. Several books on this topic, including the book by V.M. Torosov. "Mesoeconomics" (regional. Economics) of 2004 ("The best scientific book of Russia in 2004", devoted to the problems of economics [1]), Mann 2011 [2] and Eng 1987, [3] most accurately determine the field of application of mesoeconomics. As of 2014, 474 articles and books have been written on this topic.

Mesoeconomics is not a generally recognized term, in contrast with microeconomics or macroeconomics. Several books on this topic including Mann in 2011 and Ng in 1987 help define the scope of mesoeconomics. Scholarly articles on the topic are starting to increase in number with 474 articles and books on the topic in a database search in July, 2014. The term Mesoeconomics is still emerging and should be used with restraint due to unfamiliarity with most audiences.

The term comes from "meso-" (which means "middle") and "economics", and is constructed in analogy with micro and macro economics.