In this lesson, learners play a game to guess which objects have been used as money throughout history. In the process, they learn several basic economic concepts. For instance, money must be a unit of account, meaning that it must be able to break down into smaller pieces that equate with the goods or services desired. They also learn that money must be a store of value; it must keep its value over time. Finally, the students will compare modern U.S. money with older versions of U.S. money using web sites and real coins and then use this new knowledge to design the money of the future.