Social division of labor, one of the two aspects of the division of labor, is the social structural foundation of the specialized commodity production divided between industries, firms, and occupations of workers (otherwise known as the technical division of tasks). Marxists argue that capitalism, and modes of production in general, change through revolutions in the means of production, which result in populations of unemployed workers who are over-specialized in niche occupations and, as a result, are unable to reenter the labor force amid spiraling unemployment.