Isn't is exactly the same with the system we have now?
The question we have to ask is about 99% of population of peasants who work 8h a day same as they did in Mesopotamia. Do they have a living standard, healthcare, possibility to have social bonds, possibility to retire. Basically all the things to have a life.
If peasants are able to have all this, I really don't care if some King of ours has 20 trillion or 50 bazillion. In money or in gold.