http://simulator.investopedia.com/ In one of my high school business classes we did an activity where we got to buy and sell stocks on paper for a quarter, and it was a great expierence. The down side to that expierence is that it was limited to the major stocks listed in the local paper, and we had to hand calculate all of the transactions. Today with new technology this experience has been greatly enhanced. One of the best systems available is on investopedia.com. The investopedia.com solution starts you with 100,000 in virtual cash and lets your students trade on there website in real time, so they can have a great virtual stock trading experience. The down side is that each student must register for an account. If you are ready to teach students about investing I would also recommend The Motley Fool Investment Guide for Teens.