Barney Frank

I like optimists. Who doesn't? Optimism is one of America's defining national characteristics, and was an essential part of this country's rise to greatness. But some academic studies suggest that people with too rosy an outlook can get themselves into trouble, especially financially, and can-do can quickly turn into couldn't-do.The trouble with optimismOf course, it's not just Americans who can find their optimism tipping over into overconfidence or even self-delusion. Last year, Australian researchers uncovered similar traits in their compatriots. Unusually optimistic subjects in their trials tended to work fewer hours, have shorter planning horizons and fail to clear their credit card balances in full each month.But there's plenty of that here too. A 2005 Duke University study, Optimism and Economic Choice, found a similar correlation in the U.S. And another, published in the Journal of Economic Psychology in 2007, indicated that the overoptimistic often make poor choices when choos...

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