As the subject of Karl Marx’s economics studies

use value does not refer to usefulness in the general sense

but the commodity attribute which is intrinsically connected with the capitalist relations of production. Functions of money

analyzed within the framework of simple commodity circulation

cannot cover all use values of money. The use value of money

in essence

is increasing value by aiming at money itself. This is a unique historical phenomenon of the capitalist mode of production. The use value only in this sense constitutes the research subject of Marxist economics. The use value of labor as commodity means that its value can only increase by actually using it

that is

labor itself. Therefore

the realization of the use value of labor has become the real basis for the creation of surplus value. This particular relation of production determines the historical inevitability of value increase. Therefore

the investigation of the use value of labor is a necessary step to reveal the secret of surplus value. Karl Marx thought about the use value based on specific relations of production

avoiding the limitations of empirical and intuitive methods. At the same time

by grasping the development law of human society as a whole

it reveals the historical mechanism for use value

thus overcoming the limitations of all non-historical ways of thinking inherent in old researches of economics.