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the advances estimated in labour. But this must necessarily be the same as the quantity of labour which they will command, as appears from the instances above stated, and will be more fully shown farther on; and where the precious metals may be considered for short periods as of a uniform value, the conformity of this measure with the proportions of money prices at which commodities would be exchanging all around us, might daily be brought to the test of experience and be established beyond the possibility of doubt.
It will be said, perhaps, that in the same place, and at the same time, almost every commodity may be considered as an accurate measure of the relative value of others, and that what is true of labour in this respect is true of cloth, cotton, iron, or any other article. Any two commodities which, at the same time, and in the same place, will purchase or command the same quantity of cloth, cotton, or iron, of a given quality, will have the same relative value, or will exchange with each other.
This will be readily granted, if we take the same time and place exactly, and consider only relative value; but not if either any latitude be allowed as to time and place, or if we consider, as it is our object to do, not merely relative, but
