> What evidence indicates it's 95% and not 20% or 80% or 99%?
I'm not sure I understand your question. If you're asking the method by which this is done, it's a pretty straightforward econometric analysis problem - any graduate student probably does something similar in their first year.
If you're asking what the exact percentage is, I don't know. I remember it's in the range of 90% or 95%, but not the exact number. (It also varies slightly with economic cycles anyway, because the main determinant is the relative elasticities of supply and demand for labor).
I'm not sure I understand your question. If you're asking the method by which this is done, it's a pretty straightforward econometric analysis problem - any graduate student probably does something similar in their first year.
If you're asking what the exact percentage is, I don't know. I remember it's in the range of 90% or 95%, but not the exact number. (It also varies slightly with economic cycles anyway, because the main determinant is the relative elasticities of supply and demand for labor).