The Avant-Guarde Stratification of Nations

In modern economic thinking, there is an unclear division of the population into rich, poor and middle class. This structuring originated in the time of Euripides and Aristotle. However, there is still no general method for determining the parameters of the middle class, although the dynamics of growth and development of national economies significantly depends on it. The author proposes to stratify the population by the criterion of GDP per capita, calculated by purchasing power parity. At the same time, the author determines the parameters of the avant-garde, middle and rear-guard strata of the nation on the route of economic development using the proposed development gamma scale.