There was only the barter system. If you have some commodity which I need, I take it from you in return for some other commodity which I have but which you need. But as it was a very inconvenient system, we have created a new policy of currency, which is very helpful because we cannot carry commodities from place to place for purpose of exchange. This is the principle of wealth or the economic system of life. But wealth has only an instrumental value.
Money is a means to the fulfilment of our needs which are primary.
We do not require money as such. Nobody wants money only. It is a tool to the fulfilment of our desires. So, when we ask for economic fulfilment, what we actually ask for is the fulfilment of the bodily or physical needs, with all their social relations. Money is an instrument which is utilised as a necessary means to the fulfilment of the longings of man.