The Wealth of Nations by Part 2 Chapter 4 Page 9

shall, during the continuance of the loan, annually assign to the lender a smaller portion, called the interest; and at the end of it a portion equally considerable with that which had originally been assigned to him, called the repayment.

Though money, either coin or paper, serves generally as the deed of assignment both to the smaller and to the more considerable portion, it is itself altogether different from what is assigned by it.

In proportion as that share of the annual produce which, as soon as it comes either from the ground, or from the hands of the productive labourers, is destined for replacing a capital, increases in any country, what is called the monied interest naturally increases with it. The increase of those particular capitals from which the owners wish to derive a