No, that’s not what I mean. The studies I am talking about measure the productivity of the company and are not concerned with what happens to the workers.
It’s difficult to talk about these supposed studies, since you didn’t link any, but unless done carefully, they would also be vulnerable to the same issues as the grandparent (confounding over time, basically).
If you mean stuff like this:
http://aje.oxfordjournals.org/content/169/5/596.full#ack-1
that does not say what you probably think it says (because of the “healthy worker survivor effect.”)
No, that’s not what I mean. The studies I am talking about measure the productivity of the company and are not concerned with what happens to the workers.
It’s difficult to talk about these supposed studies, since you didn’t link any, but unless done carefully, they would also be vulnerable to the same issues as the grandparent (confounding over time, basically).