Instead of reacting to market rumors, anecdotes or advice with a healthy dose of skepticism, many people not only believe, but also act on what they hear, supremely confident that they are able to discern fact from fiction. Thinking that they know more than they do, they express their opinion as fact on subjects they actually know little about. Because admitting you don't know something is considered a sign of ignorance, people would rather pretend to be confident and live with the consequences of being wrong. Instead of listening, they talk. Instead of learning, they lecture. Instead of waiting patiently, they act speculatively.