Which concept explains the rise of global stratification as including core nations, semi periphery nations, periphery nations, and external areas?

The concept mentioned above is called World System Theory. It is produced by sociologists named  Immanuel Wallerstein and for him, it is a way to deal with world history and social change that proposes there is a world financial framework in which a few nations advantage while others are misused.

i dont really know

Explanation: