After producers or merchants produce, transport and store commodities, they supply and display them for the convenience of consumers' purchase. The reward which consumers return to producers or merchants is profit. According to Marx, capitalism will inevitably lead to ruin in accordance with certain laws of economic movement. In order to gain as much profit as possible, capitalists compete for introducing new machinery. Consequently, because of excessive accumulation of capital, profit is gradually reduced.
Weak capitalists go bankrupt.
Therefore, the capitalist production method will be destroyed because of profit itself. Since capitalists intend to increase profit, they always intend to reduce wages. Because machinery is constant capital, and labor power alone produces profit, they try to increase profit by keeping wages down and strengthening labor power. At the same time, because of the introduction of new machinery, many laborers are dismissed and become the unemployed. In this manner, the increase of profit and the increase of wages are mutually contradictory.