That photo of a poker table is quite apt. Even if you play sensibly, if you're sitting with a bunch of people who aren't, there's a fair chance one of them will

That photo of a poker table is quite apt. Even if you play sensibly, if you're sitting with a bunch of people who aren't, there's a fair chance one of them will hit the card he needs and beat you. In the economy this can also happen. Consider that you might make a bet on some business because you have done good research (your estimate of the future is what it actually averages to) and it shows the business will do well. A load of random people will have varying degrees of correctness of analysis that will give them too optimistic or pessimistic estimates. The future itself is also affected by noise, and business conditions may change. You're going to end up seeing a bunch of winners who were too optimistic about some business, but the winds changed and they won bigtime.