When the Rochester Institute of Technology surveyed business owners with M.B.A's from one top business school, they found that money was the primary motivation for only 29 percent of the women, versus 76 percent of the men. Women put a premium on autonomy, flexibility (25 to 35- hour weeks and proximity to home), fulfillment and safety.
Source: Farrell, Warren. "Exploiting the Gender Gap". The New York Times, September 5, 2005, A 23. http://www.nytimes.com/2005/09/05/opinion/05farrell.html?_r=0 (Verified 04/18/14)