So where do low performers come from and where do they go to when you fire them? What is their flow through the economy? A fired low performer will still look f

So where do low performers come from and where do they go to when you fire them? What is their flow through the economy? A fired low performer will still look for, and likely find, another job. The assumption there might be that they will learn and try harder, but whether that is the actual effect is much less obvious than you might think. It's also not obvious at all that churn is good for overall productivity of an economy. Can you show that making firing harder or easier causally affects average productivity (or the productivity distribution) in a specific direction?