If the retailer is a monopoly, it can use its market power to dominate capitalists, to set its purchase price below the actual value of the commodity. This is one manifestation of imperialism, a way that surplus value is extracted from dominated countries. This puts pressure on the capitalist, who in turn intensifies pressure on the workers. Often, their wages are pushed below the amount required for survival. We see this happening with giant multinational retailers such as Walmart and Gildan.