Ricardo's Theories of Wages and Profits
Several authorities consider that Ricardo is the source of the concepts behind the so-called Iron Law of Wages, according to which wages naturally tend to a subsistence level. Others dispute the assignment to Ricardo of this idea.
Ricardo believed that in the long run, prices reflect the cost of production, and referred to this long run price as a Natural price. The natural price of labour was the cost of its production, that cost of maintaining the labourer. If wages correspond to the natural price of labour, then wages would be at subsistence level. However, due to an improving economy, wages may remain indefinitely above subsistence level:
Notwithstanding the tendency of wages to conform to their natural rate, their market rate may in an improving society, for an indefinite period, be constantly above it; for no sooner may the impulse, which an increased capital gives to a new demand for labor, be obeyed, than another increase of capital may produce the same effect; and thus, if the increase of capital be gradual and constant, the demand for labour may give a continued stimulus to an increase of people....
It has been calculated, that under favourable circumstances population may be doubled in twenty-five years; but under the same favourable circumstances, the whole capital of a country might possibly be doubled in a shorter period. In that case, wages during the whole period would have a tendency to rise, because the demand for labour would increase still faster than the supply. (On the Principles of Political Economy, Chapter 5, "On Wages").
In his Theory of Profit, Ricardo stated that as real wages increase, real profits decrease because the revenue from the sale of manufactured goods is split between profits and wages. He said in his Essay on Profits, "Profits depend on high or low wages, wages on the price of necessaries, and the price of necessaries chiefly on the price of food."
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