The Wisdom of Crowds and the prediction markets

clipped from mckinseyquarterly.com

James Surowiecki: The Wisdom of Crowds is not an argument against experts. It is saying that you shouldn’t rely wholly on the judgment of one person or even a very small group of people. But for a crowd to be smart, it needs to satisfy certain criteria. It needs to be diverse, so that people are bringing different pieces of information to the table. It needs to be decentralized, so that no one at the top is dictating the crowd’s answer. It needs to summarize people’s opinions into one collective verdict. And the people in the crowd need to be independent, so that they pay attention mostly to their own information and don’t worry about what everyone around them thinks.