indeed would enlarge with the demand, but
its value would be invariable, and it would be eminently well calculated
to measure the varying value of all other things. I have already in a
former part of this work considered gold as endowed with this
uniformity, and in the following chapter I shall continue the
supposition. In speaking therefore of varying price, the variation will
be always considered as being in the commodity, and never in the medium
in which it is estimated.

CHAPTER IV.

ON NATURAL AND MARKET PRICE.

In making labour the foundation of the value of commodities, and the
comparative quantity of labour which is necessary to their production,
the rule which determines the respective quantities of goods which shall
be given in exchange for each other, we must not be supposed to deny the
accidental and temporary deviations of the actual or market price of
commodities from this, their primary and natural price.

In the ordinary course of events, there is no commodity which continues
for any length of time to be supplied precisely in that decree of
abundance, which the wants and wishes of mankind require, and therefore
there is none which is not subject to accidental and temporary
variations of price.

It is only in consequence of such variations, that capital is
apportioned precisely, in the requisite abundance and no more, to the
production of the different commodities which happen to be in demand.
With the rise or fall of price, profits are elevated above, or depressed
below their general level, and capital is either encouraged to enter
into, or is warned to depart from the particular employment in which the
variation has taken place.

Whilst every man is free to employ his capital where he pleases, he will
naturally seek for it that employment which is most advantageous; he
will naturally be dissatisfied with a profit of 10 per cent., if by
removing his capital he can obtain a profit of 15 per cent. This
restless desire on the part of all the employers of stock, to quit a
less profitable for a more advantageous business, has a strong tendency
to equalize the rate of profits of all, or to fix them in such
proportions, as may in the estimation of the parties, compensate for
any advantage which one may have, or may appear to have over the other.
It is perhaps very difficult to trace the steps by which this change is
effected: it is probably effected, by a manufacturer not absolutely
changing his