Ordinary or average rates of wages, profit,
and rent
may be called natural rates,
to pay which a commodity is sold at its natural price,
or for what it really costs, which includes profit,
since no one will go on selling without profit.
Market price
is regulated by the quantity brought to market and the effectual demand.
When the quantity brought falls short of the effectual demand, the market price rises above the natural;
when it exceeds the effectual demand the market price falls below the natural;
when it is just equal to the effectual demand the market and natural price coincide.
It naturally suits itself to the effectual demand.
When it exceeds that demand, some of the component parts of its price are below their natural rate;
when it falls short, some of the component parts are above their natural rate.
Natural price is the central price to which actual prices gravitate.
Industry suits itself to the effectual demand,
but the quantity produced by a given amount of industry sometimes fluctuates.
The fluctuations fall on wages and profit more than on rent,
affecting them in different proportions according to the supply of commodities and labour.
But market price may be kept above natural for a long time,
in consequence of want of general knowledge of high profits,
or in consequence of secrets in manufactures,
which may operate for long periods,
or in consequence of scarcity of peculiar soils,
which may continue for ever.
A monopoly has the same effect as a trade secret,
the price of monopoly being the highest which can be got.
Market price is seldom long below natural price,
though apprenticeship and corporation laws sometimes reduce wages much below the natural rate for a certain period
Natural price varies with the natural rate of wages, profit and rent.
Wages will be dealt with in chapter viii.,
profit in chapter ix.,
differences of wages and profit in chapter x.,
and rent in chapter xi.