Which theory differentiates among "core," "periphery," and "semi-periphery"?

Question

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World Systems Theory differentiates among "core," "periphery," and "semi-periphery." This theory suggests that the world is divided into three interconnected and hierarchical economic groups - the core countries, the periphery countries, and the semi-periphery countries - based on their level of economic development and integration into the global economy. The core countries are the most economically developed, technologically advanced, and wealthy, dominating the global economic system. The periphery countries are typically the poorest and least developed, and often specialize in the production of raw materials and cheap labor. The semi-periphery countries fall somewhere in between, possessing some level of industrial development and access to international markets, but also still dependent on the core countries for technology and investment.

Which Theory Differentiates Among "Core," "Periphery," and "Semi-Periphery