Classroom market experiments can complement the theoretical orientation of standard industrial organization courses, This paper describes various experiments designed for such courses, and presents details of a multi-market game with entry and exit. In this experiment incumbents have a cost advantage in their 'home' markets, and mobile firms decide which market to enter. After entry decisions are made, firms choose prices and quantities to offer for sale. Predatory pricing is possible with this setup, and the experiment can be used to motivate discussions of monopoly, competition, entry, and efficiency. Other classroom experiments with an industrial organization focus are surveyed. (C) 2000 Elsevier Science B.V. All rights reserved. JEL classification: C72; C92.