Trade is trade. You can trade for lots of things besides just a green back piece of paper. I can trade a farmer for some of his grain by repairing his tractor. You can trade the grain you just got in to a restaurant and get some free meals.

That's the natural way of things, that's the natural order. The silver tongue come in and become the head of that order and create banks, and standardized currency.

Everyone has to want the same thing (money) in this new order instead of everyone having unique pursuits and talents creating a true free market. Instead, money weighs the world down as it's the bottleneck of a sole focus.