2. Aristotle says: - "We call Wealth everything whose value is measured by Money," or rather, we may say everything which is exchangeable, as Money itself is an Exchangeable Quantity.

Aristotle's definition of Wealth is now generally accepted by modern Economists as the true one, thus Mill says: - "Everything forms therefore a part of Wealth which has power of purchasing." In these passages we find what the fundamental general conception of "Wealth is - it is anything whatsoever, whatever its nature be, which is exchangeable - which maybe bought and sold - everything which can be exchanged separately and independently of anything else.

The only criterion, then, of anything being Wealth is - can it be valued? Can it be bought and sold? Can it be exchanged separately and independently of anything else?

This criterion may seem very simple, and it is now generally adopted as the true one; but in fact to apply it properly, to discern what is and what is not, separate and independent exchangeable property, requires a thorough knowledge of some of the most abstruse branches of Law and Commerce.