The rational investor is diligent, skeptical and appropriately risk-averse at all times, but also on the lookout for opportunities for potential return that more than compensates for risk. That’s the ideal. But in good times, we hear most people say, “Risk? What risk? I don’t see much that could go wrong: look how well things have been going. And anyway, risk is my friend—the more risk I take, the more money I’m likely to make.”