How do the Brandt line, Walt Rostow's Modernization model, neocolonialism, and Wallerstein's world systems theory inform and intersect with each other when explaining economic development?

These models provide various explanations for the disparities in economic development. Wallerstein’s world systems theory divides the world into core, semi-periphery, and periphery nations. According to this theory, core nations are highly developed nations, semi-periphery are developing nations, and periphery are underdeveloped nations. This theory intersects with the Brandt Line model of economic geography in that most underdeveloped nations fall within the Brandt Line, which divides the world between the North and South, the North being developed nations. Furthermore, according to Wallerstein, core and periphery nations work together for their developmental needs. Yet, from a neocolonialist perspective, these core nations also once were the colonizers of the peripheral nations. As a result, they continue to dictate the underdeveloped nations' economies and trade, and subsequently, their independence. Economic growth is required for periphery countries to move from subsistence/agricultural economies to industrialization, as the Rostow Modernization model demands.