The development of the system paradigm in economic science leads to the formulation of a number of important questions to the political economy as one of the basic directions of economic theory. In this article, on the basis of system introspection, three questions are considered. The first is the relevance of the class approach to the structuring of the socio-economic space; the second is the feasibility of revising the notion of property in the modern world; the third is the validity of the notion of changing formations as the sequence of “slave-owning system — feudal system — capitalist system”. It is shown that in modern society the system approach to the structuring of socio-economic space is more relevant than the class one. Today the classical notion of “property” does not reflect the diversity of production and economic relations in society and should be replaced by the notion of “system property”, which provides a significant expansion of the concepts of “subject of property” and “object of property”. The change of social formations along with the linear component has a more influential cyclic constituent and obeys the system-wide cyclic regularity that reflects the four-cycle sequence of the dominance of one of the subsystems of the macrosystem: project, object, environment and process.
