Money managers work in a stressful, competitive pressure cooker that's hard to appreciate from the safety of a business management classroom. That's why HBS professors Joshua Coval and Erik Stafford invented upTick—a market simulation program that has students sweating and strategizing as they recreate classic market scenarios.

The evidence isn't conclusive, but new research from Harvard Business School suggests younger fund managers may have contributed to the tech stock bubble. Professor Robin Greenwood discusses the research paper, "Inexperienced Investors and Bubbles," and what mutual fund investors should keep in mind.