Great piece in Money magazine by Eric Schurenberg. He asked Philip Tetlock, a Berkeley prof and expert on experts, why so many experts missed the housing crash and which experts are likely to be right about how it will resolve. Among his answers:

What makes some forecasters better than others?

The most important factor was not how much education or experience the experts had but how they thought. You know the famous line that [philosopher] Isaiah Berlin borrowed from a Greek poet, "The fox knows many things, but the hedgehog knows one big thing"? The better forecasters were like Berlin's foxes: self-critical, eclectic thinkers who were willing to update their beliefs when faced with contrary evidence, were doubtful of grand schemes and were rather modest about their predictive ability. The less successful forecasters were like hedgehogs: They tended to have one big, beautiful idea that they loved to stretch, sometimes to the breaking point. They tended to be articulate and very persuasive as to why their idea explained everything. The media often love hedgehogs.

HT Barry Ritholtz