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This paper analyzes the gender distribution of research fields in economics based on a new dataset of almost 1,900 researchers affiliated to top-50 economics departments in 2005, as ranked by Econphd.net website. We document that women are unevenly distributed across fields and test some behavioral implications from theories underlying such disparities. Our main findings are that the probability that a woman works on a given field is positively related to the share of women already working on that field (path-dependence), and that this phenomenon is better explained by women avoiding male-dominated fields than by men avoiding female dominated fields. This pattern, however, is weaker for younger female researchers who spread more evenly across fields.