系统科学
The "World-Systems theory" approach of Immanuel Wallerstein sees imperialism as part of a general, gradual extension of capital investment from the "core" of the industrial countries to a less developed "periphery." Protectionism and formal empire were the major tools of "semi-peripheral," newly industrialized states, such as Germany, seeking to usurp Britain's position at the "core" of the global capitalist system.