Answer: A. The rich get richer while the poor get poorer.
Wallerstein's theory of systems is a way to understand economic and power relations among countries. The theory states that countries can be divided in core, periphery and semi-periphery. Core countries concentrate on producing high-skilled professionals with capital-intensive production, while periphery countries produce raw materials, mainly with low-skill, labor-intensive production. This pattern causes money to flow to the core, which in turn increases the capital these countries have available for capital-intensive production, reinforcing their position as core.