In response to the feudal crisis, by the late fifteenth and early sixteenth centuries, the world economic system emerged. This was the first time that an economic system encompassed much of the world with links that superseded national or other political boundaries.
The new world economy differed from earlier empire systems because it was not a single political unit.
Empires depended upon a system of government which, through commercial monopolies combined with the use of force, directed the flow of economic goods from the periphery to the center.
The new capitalist world system was based on an international division of labor that determined relationships between different regions as well as the types of labor conditions within each region. In this model, the type of political system was also directly related to each region's placement within the world economy.
As a basis for comparison, Wallerstein proposes four different categories, core, semi-periphery, periphery, and external, into which all regions of the world can be placed. The categories describe each region's relative position within the world economy as well as certain internal political and economic characteristics.
Empires maintained specific political boundaries, within which they maintained control through an extensive bureaucracy and a standing army. Only the techniques of modern capitalism enabled the modern world economy, unlike earlier attempts, to extend beyond the political boundaries of any one empire.