Quick thoughts on money

Is it too controversial to say that money is primarily used for exchange within a political community? What if we say that interstate trade should be conducted solely through barter, and that money should not flow out of a state? What do we make of its use as a commodity in itself? Money is for the sake of promoting the good life within a community, and not for people within the state and outside the state to exploit in order to get rich? That is, money exists to faciliate the exchange of goods and services between members of a community, so that their bodily needs can be taken care of.