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Oh? I was thinking of a study I saw and lost, but differences in benefits to those groups sound fascinating to me also. I would not have guessed the answer to be all that different, again net of pay. I won't ask you to run me a free study (but if you want to... ;) ) but do you have any basic ideas on the matter philosophically?
A study requires data which I neither have nor can easily get :-/
Handwaving my guesses about job benefits...