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Bruce 
 
My paper "Now You See It, Now You Don't: Emerging Contrary Results in Economics" Journal
of Economic Methodology Dec 1997, contains a compilation of over 20 empirical literatures
where there have been "reversals": an empirical result is apparently established, but then
a dissenting study or studies comes along with  the opposite result. The paper also
discusses alternative explanations for why this happens. The literatures cited are
sometimes, but not always, ones that involve policy issues explicitly or implicitly.
 
Robert S. Goldfarb 
 
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