Money (n.) is a guarantee that we may have what we want in the future. Though we need nothing at the moment, it insures the possibility of satisfying a new desire when it arises.
Money (n.) makes the incommensurable commensurable — impossible in truth, permissible for practical purposes; without it no exchange, without exchange no society.
Money (n.) bears the name nomisma because it exists not by nature but by law, and it is in our power to change it and make it void.
Money (n.) was invented because you cannot get a house for shoes: silver made unequal works exchangeable and so held the political community together.