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Marxian economic concept that professed to explain the instability of the capitalist system. Adhering to David Ricardo's labour theory of value, Karl Marx held that human labour was the source of economic value. The capitalist pays his workers less than the value their labour has added to the goods, usually only enough to maintain the worker at a subsistence level. Of the total worth of the worker's labour, however, this compensation, in Marxian theory, accounts for only a mere portion, equivalent to the worker's means of subsistence. The remainder is "surplus labour," and the value it produces is "surplus value." To make a profit, Marx argued, the capitalist appropriates this surplus value, thereby exploiting the labourer.