Is worth more

Billy, a little boy, used to hang out at the local corner market. The boss didn't know what Billy's problem was, but the boys would constantly tease him. They would always comment that he was two bricks shy of a load, or two pickles short of a barrel. To prove it, sometimes they would offer Billy his choice between a nickel and a dime, and Billy would always take the nickel, they said, because it was bigger. One day after Billy grabbed the nickel, the boss took
him aside and said "Billy, those boys are making fun of you. They think you don't know the dime is worth more than the nickel. Are you grabbing the nickel because it's bigger, or what?" Slowly, Billy turned toward the store boss and a big grin appeared on his face and he said, "Well, if I took the dime, they'd stop doing it, and so far I have saved $20!"