This article examines modern economy and society taking the formational approach, which is based on the concept that for the modern world and the predicted future, the economy will remain the foundation of society. An understanding of modern society as a post-capitalist society is proposed and justified. The definition of post-capitalism is determined as a stage of capitalism. Humankind would enter its last stage, a stage of liberal democracy and global capitalism. The major features of post-capitalistic society are examined and analyzed: economic, political, spiritual, cultural and domestic. The economic determinism in its pure form is supplemented with informational determinism in modern society, although the economy remains the primary determinant of social development. Post-capitalism is not a new concept but rather is a new stage in the development of a capitalist socioeconomic formation. An important distinction between capitalism and post-capitalism is that capitalism is characteristic of a society that is engaged in industrial and commercial development. A society has reached the post-capitalism stage when it has passed the industrial stage and entered the information era.