Money is what we use to show what goods or services are worth. When you do work, you are paid with money. When you sell something, the buyer gives you money. Sometimes it's a lot of money and sometimes it's just a little money. How much money you are given depends on how much what you are selling is worth. Some people try to make fake money. Making fake money is a crime called counterfeiting. Only one place in America makes money; it is called the United States Bureau of Engraving and Printing.