When Paul Feldman, an American economist, won a research contract, he would buy a bagel and pass it around  Then he got into the habit of leaving a basket of doughnuts in his office every weekend for everyone to eat  To recoup his costs, he placed a basket with a suggested price next to the bread basket  The unguarded basket collected 95% of the bread money  Later, he quit his job selling doughnuts exclusively  Every morning he put away the bagels and the collection basket
A few years later, Feldman was making as much money as he had as a research analyst
An experiment in honesty