Overconfidence is not only a personal flaw; it can be an economic force. Optimism pushes people to start projects and companies that sober forecasts would discourage.
Many ventures fail, but the few successes are visible and loudly celebrated. This creates a skewed sense of what is typical and feeds more confident entry.
The fast system focuses on the case at hand—your idea, your talent, your plan—and neglects the base rate of failure. The inside view feels persuasive.
The slow system can supply realism, but realism competes with ambition and the social rewards of confidence. In markets, confidence is contagious.
The result is a paradox: optimism creates waste and disappointment, yet it also drives innovation. The question becomes where optimism is useful, and where it is reckless.