"There were people before there was money, and there wasn't a monetary paradox that killed them all." I agree, of course. Most exchange was gift or reciproci

"There were people before there was money, and there wasn't a monetary paradox that killed them all." I agree, of course. Most exchange was gift or reciprocity-oriented. I'm just saying that money emerged for a variety of reasons, one of which (probably the biggest) was to clear accounts as communities grew to a scale where reciprocity can't scale. Barter as Adam Smith describes it never really existed in ancient societies. "Also, people did use hard money at the past. No we should not go back there, but it did exist..." Again, also agree. ", and people didn't starve because of that." But they did! Numerous economic crises, whether depressions or hyperinflation can be traced through ancient times - the 3rd century fall of the Roman empire (hyperinflation), the various Italian banking crises in the 14th and 15th centuries, Tulip mania, panics and depressions through the 1700s and 1800s, leading to the failure of the Gold standard (the ultimate hard money backstop) in the Great Depression.... Going back to your first response, "If you want to claim that monetary phenomena cause real problems, well, you must claim a link between them", but that's what Keynes (and others) spent a lot of time actually doing in the 1920-40's. The world got complicated and the gold standard broke down. The rise of shadow banking makes things even more complicated in this age.