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The market would be so much understocked with labour in the one

case, and so much overstocked in the other, as would soon force

back its price to that proper rate which the circumstances of the

society required. It is in this manner that the demand for men,

like that for any other commodity, necessarily regulates the

production of men, quickens it when it goes on too slowly, and

stops it when it advances too fast. It is this demand which

regulates and determines the state of propagation in all the

different countries of the world; in North America, in Europe,

and in China; which renders it rapidly progressive in the first,

slow and gradual in the second, and altogether stationary in the

last.