Recent articles in the front page of the Washington Post 8/22/2008 and the Business Day section of the New York Times 8/20/2008 both are talking about paying students to perform. So results so far in NY to incentivize performance on AP exams are mixed. I suspect there is not too much surprise there. It looks like the incentives were offered after students had chosen to take the classes and they get paid once. I remember this was an old debate when I was in graduate school between economists and psychologists on this topic. Economists want to design incentive compatible mechanisms that either use selection or shift goals to improve performance. Psychologists wonder how this affects the incentives that are already in play.
Well recently there has been a lot of attention on this using contingent management mechanisms to treat addictions. A nice article by Higgins and Petry
?http://neuroeconomics.typepad.com/neuroeconomics/