I would naively assume that the market forces of high unemployment would be more powerful than over-qualified employees would account for unless they sought them specifically.
Given all the mechanisms they already have in place to control the impact of turn-over it doesn't surprise me that they realized it would be cheaper just to pay people a little more.
Given all the mechanisms they already have in place to control the impact of turn-over it doesn't surprise me that they realized it would be cheaper just to pay people a little more.