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I highly recommend The Stock Market Game by Dianne Draze which is designed for grades 5 - 8. I have created a number of handouts and materials that can be used with the activities in this book. You can also use the materials when playing the official Stock Market Game. If you don't want to pay to join the "official" game, you can go to an excellent free site called StocksQuest. You can set up teams or individual competitions at this location. One more web site you'll want to check out is SmartMoney.com. My class found the website to be extremely helpful when researching stock market prices.