World Systems Theory posits that there is a world economic system in which some countries benefit while others are exploited.
Source: Boundless. “World-Systems Theory.” Boundless Sociology. Boundless, 21 Jul. 2015. Retrieved 26 Nov. 2015 from https://www.boundless.com/sociology/textbooks/boundless-sociology-textbook/global-stratification-and-inequality-8/sociological-theories-and-global-inequality-72/world-systems-theory-429-537/