Should the United States impose unilateral sanctions on Iran for its nuclear program? Should we raise the retirement age for Social Security? Should we institute a national flat tax? How about implementing merit-based pay for teachers? Or establishing a cap-and-trade system for carbon emissions?
Plenty of people have strong opinions about complex policy issues like these. But few people have the detailed knowledge of policy or economics that a solid understanding of the issues seems to require. Where do these opinions come from, if not from careful analysis and deep understanding?
A variety of uncharitable answers come to mind. Perhaps people just adopt the attitudes of their local community or favorite pundits. Perhaps people believe what they want to believe. Or perhaps people think they do understand the issues, at least well enough to support their own opinions.
A recent study by psychologist Phil Fernbach of the Leeds School of Business at the University of Colorado and his collaborators, published this May in Psychological Science, provides some evidence for this final option: people overestimate how well they understand the mechanics of complex policies, and this sense of understanding helps bolster politically extreme positions.
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