Commodities and the Process of Exchange

Everything can be reduced at some point in their genesis, in their being formed, brought back to labor. This abstraction only occurs when objects, commodities, are exchanged for one another. So if i sell a shovel to get money, let's say i get ten dollars for it, i could then turn around and take that ten dollars and buy,. don't know,i buy a a pot for cooking, whatever. What we have in this case is somehow an ean equivalent drawn between a shovel and a pot. And with this kind of exchange, money becomes very necessary. Money facilitates the system that allows for a general equivalent.