Do you think that higher pay caused higher productivity and lower turnover for Aetna?

Yes of course. When people are given a higher salary there is a much better chance of them to work more. Look at it this way: If someone pays you $8 an hour and someone else pays you $10 for the same exact job, which one are you most likely going to choose? The second one, right? And with that higher pay per hour will most likely result in better work ethic and more production.