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How Endogenous Steroids Rule on the Trading Floor

April 15th, 2008 Medgadget Editors News


An interdisciplinary group of scientists from the University of Cambridge decided to take a look at trading behaviors of male brokers in the City of London, and found that sell and buy decisions, and their successes, are often linked to hormonal concentrations of testosterone and cortisol.
From the abstract of the study, published at Proc. Natl. Acad. Sci.:

Little is known about the role of the endocrine system in financial risk taking. Here, we report the findings of a study in which we sampled, under real working conditions, endogenous steroids from a group of male traders in the City of London. We found that a trader’s morning testosterone level predicts his day’s profitability. We also found that a trader’s cortisol rises with both the variance of his trading results and the volatility of the market. Our results suggest that higher testosterone may contribute to economic return, whereas cortisol is increased by risk. Our results point to a further possibility: testosterone and cortisol are known to have cognitive and behavioral effects, so if the acutely elevated steroids we observed were to persist or increase as volatility rises, they may shift risk preferences and even affect a trader’s ability to engage in rational choice.

More from Nature: The testosterone of trading…
Paper: Endogenous steroids and financial risk taking on a London trading floor Proc. Natl. Acad. Sci. USA, 10.1073/pnas.0704025105
Image credit: miskan: Kuwait Stock Exchange

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