Personally I think those are also symptoms. In my opinion, the cause is:

1. Easy money for far, far, far too long in the US and a complete political unwillingness to take any risk of a recession, no matter the long-term cost required to stave it off. In my mind, this explains the rich-poor gap, the rise of crypto, insane valuations, house-price inflation, the weird delta between US and rest-of-world standard of living/salaries, and probably even the migration crisis.

Hey, I like easy money.