What would happen if a sizable number of traders could accurately predict the market?

The market is a game of incomplete information. Every bid or sale is a move made without full knowledge of what others will do.

**A thought experiment**: Imagine a scenario where a large number of people/traders consistently know which way stocks and the market are headed. In other words, what if the market began to be known in advance by a critical mass of participants?

* Would prices become more 'correct' or would the idea of a 'correct price' lose all meaning?
* Would prices stabilize or swing more wildly?
* What happens to a market built on uncertainty when a large group of participants begin to know more than others?