> Plus American government overspending, to be fair, but that's just a US phenomenon.
That's not true. US spent the most, but Europe spent €3.2 trillion. US spent $12 trillion but they had to "shore up" a lot of global banks because that's just what they do. About half went into asset purchases and liquidity measures.
I take a simple approach. What would you expect to happen if you just created trillions out of thin air and distributed it? Arguing nothing would happen is the economic equivalent of a perpetual motion machine. It just doesn't pass the smell test to me because you can just create global wealth from changing some numbers in a computer with no repercussions. It's alchemy. Can I "prove" that there are negative consequences that in the long run outweigh the benefits? No. But I can say that I cannot find a single case of high inflation that did not coincide with government printing money. Printing a lot of money doesn't always cause inflation, but any time there is inflation there has been a lot of money printing.
Sure what happens may not be predictable, but its obvious that you're messing with a complex system and effects aren't instantaneous or uniform. That's why you see things like product X is going up 50% while product Y is going up 5%. And the people that point this out think they're debunking something.
With complex systems its best to keep things simple. You can get lost in the data from all the noise and overconfidence will bite you in the ass. Which is why it's not a smart idea to increase the money supply by 30+% in a year and dump it into the market.
https://www.weforum.org/agenda/2020/04/european-union-financ...
https://www.covidmoneytracker.org/