What is the driving force behind the labor shortage in the US is?

Ad_Quid_Orator
a lot of people have said the government has given away too much money but data shows that if this is a factor behind it, it's a drop in the bucket. Here's what it really comes down to:
Baby boomers (who were a non negligible part of the workforce despite the claims by all these dipshits that we could have isolated the vulnerable and preserved the economy) were forced into retirement.

Having to spend time at home made Gen X realize that time is more than money and even though they weren't making as much working as many hours as they were pre-pandemic and thus not earning as much, many found that the extra time they had gave them a better quality of life than the luxuries working as much as they did could afford.

Millennials are scooping up the skilled jobs left by boomers and Xers left and right, leaving retail jobs that they had to take during the recession to make a living.

Half of Generation Z hasn't graduated High School yet.

As a side note I think the events of 2020-2021 (coupled with those of 2007-2008) will make us re-think were we draw the lines between generations, but that's another story.
What is the driving force behind the labor shortage in the US is?
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