The effect on the working class is not less profound. As long as the hand-worker still played an important part in the works premises, as long as the variable part was superior or equal to the constant part in the organic composition of capital, as was the case prior to and at the beginning of large-scale industry, the accumulation of capital meant an increased demand for wage-labour. The position was changed as Capitalism developed, in the manner just described. Although the mass of capital grows, there is a relative decrease in the demand for workers. For this growth of capital refers chiefly to the constant part (machinery and raw materials), while there is a relative shrinkage in the variable part; that means the worker is obliged to consume a much greater quantity of raw material than formerly. And whereas the prices of commodities fall during the phase of the high organic composition of capital, the period of necessary labour (the hours needed for the reproduction of wages) becomes shorter, while the period of surplus labour becomes longer. The great industrial development therefore signifies for the worker: intensive exploitation and relative over-population, a reserve army of labour-power, which is absorbed by industry in times of prosperous trade, and is speedily demobilised when the slump comes. In times of good business the reserve army serves to check the wage demands of the workers regularly employed, and in times of bad trade it serves to depress wages. The outcome for the workers is as follows: