What Do Psychologists Know that Economists Don't?

This struck me as interesting - "Psychologists may be more-successful investors than other presumably smart people, like physicists, mathematicians, and even economists. In a study of shareholder behavior, psychologists were found less likely to follow the 'herd' instinct to buy shares of stocks they deemed overvalued. As a result, psychologists earned three times as much as economists and physicists did in a stock exchange simulation, reports economist Andreas Roider of the University of Bonn. Could there be other life applications for this finding? http://www.uni-bonn.de/en/News/72_2006.htm"

Hap tip again to Dan Miller's 48 Days for the source info.