REWARDS and MOTIVATION
There is an old joke that nicely illustrates the principle. An elderly man, harassed by the taunts of neighbourhood children, finally devises a scheme. He offered to pay each child a dollar if they would all return Tuesday and yell their insults again. They did so eagerly and received the money, but he told them he could only pay 25 cents on Wednesday.
Explanation
There is an old joke that nicely illustrates the principle. An elderly man, harassed by the taunts of neighbourhood children, finally devises a scheme. He offered to pay each child a dollar if they would all return Tuesday and yell their insults again. They did so eagerly and received the money, but he told them he could only pay 25 cents on Wednesday.
Alfie Kohn http://naggum.no/motivation.html
Studies Find Reward Often No Motivator