Cash money can be seen and touched, so it’s easy to know when your wallet is empty. But kids need to understand that plastic is not limitless. Give an age-appropriate 101 on the cost of borrowing. Teach that it costs more money to borrow, so that iPad she wants may cost $600 now, but it could cost another $100 dollars if you borrow money you don’t have. Wouldn’t she rather have that $100 for something else?