The first is natural exchange. Two parties barter for the goods needed by their communities, whether these are their households or their cities. The goods that are necessary for life are the true riches, and it is easy to say when one has enough of these. Aristotle compares the business of life, which is the business of maintaining a household, with any other art. In the other arts, there is a limit to the number of tools the craftsman needs to do his work.
Riches are also a collection of tools for the householder and craftsman alike.
Just as a carpenter does not need more than a few tools, so the head of the household does not need more than a certain amount of money. Even if we suppose that a person wanted a comfortable, and even luxurious life, even then he could still determine when he had enough money. The second type of exchange is wealth-getting. The business of seeking wealth for the sake of wealth does not have any natural limit. When our purpose is to get sufficient food , clothing and shelter, or any other goal in a human measure, we know that there is a definite and measurable goal.