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BARELY a week goes by without a report on the level of confidence among consumers, businesspeople and investors. Optimism is what�s wanted�Keynes talked of the �animal spirits� that influence economic activity. Pessimists are routinely denounced as Jeremiahs. Those who try to bet on falling prices find their activities are restricted.

A cheery disposition may be necessary for societies to function. Daniel Kahneman, a psychologist and Nobel economics laureate, has a chapter in his book �Thinking Fast and Slow� which describes overconfidence as �the engine of capitalism�. No entrepreneur can be sure that his planned investment will succeed but if no one took a risk, new products and jobs would never be created. A certain blindness to the odds may be necessary. According to Mr Kahneman, the chances of an American small business surviving for five years are just 35%. But ask individual entrepreneurs about their prospects and 81% think they have a better than seven-in-ten chance of success.

This self-confidence may be innate, just as most people think they are better-than-average drivers. And it would seem logical that the most optimistic people gravitate towards entrepreneurship. That is good for consumers, who can select from a wider variety of products. Even the failed businesses serve a purpose. Daniel Gross, a journalist, wrote a book claiming that bubbles were good for economies since they leave behind infrastructure (canals, railways, fibre-optic cable) that can last for generations.