[bmuon]

This is a typical case of how incentives have a tendency to go wrong. I recommend you to listen to this Freakonomics Radio podcast which tells a series of stories about incentive failure, for example an indian town which started farming cobras when a ruler started giving out money for each cobra head after an infestation.

http://www.freakonomics.com/2012/10/11/the-cobra-effect-a-ne...