Money was revolutionary because you could finally get the stuff you wanted. Bartering was good and all, but say you have a horse, but you want 3 cattle. You find someone who has at least three cattle and ask them to trade your horse for those cattle. Turns out he doesn’t want a horse and only wants food so you don’t trade, so you’re kinda screwed. With money on the other hand, the person would be more inclined to sell his cattle because that person can get food with it. The problem of not wanting or needing what someone’s offering you goes away.

It opens up the door for anyone to get services like healthcare, or learn how to read because you’ll always have something the other person needs or wants: MONEY.