In a small town in Illinois many years ago, there was group of boys at the local drugstore who would always tease a little boy named Johnny Mueller. I was the manager of the drugstore, back then, and I felt sorry for the kid. I noticed that the older boys liked to play a particular prank on Johnny: They would hold out a dime and a nickel and tell him to choose one. 

Johnny always took the nickel, saying that coin had to be better because it was bigger. Every day they played the same joke, over and over again, laughing when Johnny chose the nickel.

One day I’d had enough and took Johnny to one side. “Son, there’s something you ought to know—those boys are tricking you. A dime is worth twice as much as a nickel.” 

“Quiet!” the little boy whispered to me. “I’ve already made 10 bucks off those idiots!”