From 'Centuries'
Early on in Bill Gates career when he became the net guru that he is, a young man sat down and figured out what Bill Gates actually made per hour. He pondered that if Bill was walking down the street and dropped a bill (currency), what sized bill would it have to be to make Bill Gates bend over and pick it up.
The guy estimated that since Bill Gates was making approximately $150 dollars per SECOND, and that it would take an estimated 4 seconds for him to bend over and retrieve a dropped bill, that it would have to be at least a 500 dollar bill to be worth his time. Otherwise, the 4 seconds it took him to bend over and retrieve the bill would be actually costing him money.
