I found that women entrepreneurs earn 50% less than their male counterparts.

Education
Warren Farrell holds a Ph. Does Feminism Discriminate Against Men?: A Debate.  
Farrell W; Sterba JP; Svoboda S (2008).

All of his books are related to men's and women studies; consistent to his books since the early 90's has been a call for a gender transition movement. He came to prominence in the 1970s as one of the leading male thinkers championing the cause of second wave feminism and serving on the New York City Board of the National Organization of Women (NOW). His books cover twelve fields: history law sociology and politics (The Myth of Male Power); couples’ communication (Women Can’t Hear What Men Don’t Say and Father and Child Reunion); economic and career issues (Why Men Earn More); child psychology and child custody (Father and Child Reunion); and teenage to adult psychology and socialization (Why Men Are The Way They Are and The Liberated Man).