How Close Does System Two Monitor the Suggestions of System One?

Many people are over confident, prone to place too much faith in their intuitions. They apparently find cognitive effort at least mildly unpleasant, and avoid it as much as possible. Many thousands of university students have answered the bat and ball puzzle,. The results are shocking. More than 50 % of students at harvard, m i t and princeton gave the intuitive, incorrect answer. At less selective universities, the rate of emonstrable failure to check was in excess of 80%.