therefore, have always proved favourable to the debtor, and ruinous to the creditor, and have sometimes produced a greater and more universal revolution in the fortunes of private persons, than could have been occasioned by a very great public calamity.

It is in this manner that money has become in all civilised nations the universal instrument of commerce, by the intervention of which goods of all kinds are bought and sold, or exchanged for one another.

What are the rules which men naturally observe in exchanging them either for money or for one another, I shall now proceed to examine.

These rules determine what may be called the relative or exchangeable value of goods.

The word value, it is to be observed, has two