world systems theory - a dependency model, meaning that countries do not exist in isolation but are part of an intertwined world system in which all countries are dependent on each other
core-periphery model - dividing countries into three types:
core: dominate and exploit peripheral countries for labor and raw materials
semiperiphery: share characteristics of both core and peripheral countries; act as a buffer between the core and periphery
periphery: dependent on core countries for capital; have underdeveloped industry
commodities - raw materials like coffee, cocoa and oil