There is of course averyinterestingquestion whether the risk aversion of the regulator is more or less rational than the priesthood's apparent appetite for risk.
As discussed in yesterday's posting, the question of attribution is very complicated, and a lot of the most interesting discussions of the last few days have been on the basis of deep background.
The second study gets at the veryinterestingquestion of whether lottery based studies show improved outcomes because those receiving vouchers get a better education, or if the lottery motivates them somehow.