2 labor force: labor force, people's ability to work, and the sum of brain power and physical strength contained in the human body. Labor force can be divided into broad sense and narrow sense. The labor force in a broad sense refers to the whole population. In a narrow sense, the labor force refers to the population with the ability to work. In actual statistics, the working-age population and the total amount of social labor resources are indicators that consider two factors: working age and working ability. In the traditional or early concept, labor refers to "laborers" mainly engaged in manual labor, that is, "working class" or industrial workers. Marx's theory divides the labor force into workers in the production sector and workers in the non-production sector. The difference between mental workers and manual workers in the era of knowledge economy is no longer reflected in the essential characteristics of labor. "