"Lift my bank," said Billy. "It's almost full."

"Yes, it is heavy," said the mother. "You are learning to save your money and that's good."

"But Jimmy says he has more money than I do and his bank isn't nearly as heavy," protested Billy.

"I do have more money than you do -- lot more," said Jimmy.

"You see, Bill," said the mother, "Jimmy has been saving dimes and you've only been saving nickels; so Jimmy does have more money."…