> If most don't have any money to buy products, just invent some other money and start paying one of the other people who doesn't have any money to start making

> If most don't have any money to buy products, just invent some other money and start paying one of the other people who doesn't have any money to start making the products for you. This isn't possible if you want to pay sales taxes - those are what keep transactions being done in the official currency. Of course in a world of 99% unemployment presumably we don't care about this. But yes, this world of 99% unemployment isn't possible, eg because as soon as you have two people and they trade things, they're employed again.