AlfieKohn wrote an interesting article: http://www.alfiekohn.org/managing/fbrftb.htm
- more than a decade ago!

So did RichardStallman in his essay Rewards No Motivator.

''Is it online anywhere ? My searches only found other Alfie Kohn articles such as
"Studies Find Reward Often No Motivator" http://www.fsf.org/philosophy/motivation.html ''

Alfie Kohn wrote much more thought provoking stuff in his book NoContest where he challenges one of the fundamental assumptions of American life, competition.