Where are all the women? A far-ranging study from the National Commission on Entrepreneurship finds only half as many women as men are starting businesses. Why? For starters, men network more broadly than women, says the NCOE's Michael Camp. (In fact, only 37% of women say they know an entrepreneur, vs. almost half of men.) That gives men more resources to launch a company. And women are finding that owning a business doesn't necessarily mean it's easier to juggle work and family, says Patricia G. Greene, a professor at the University of Missouri at Kansas City. Finally, while technology is the hot spot in entrepreneurship, relatively few women major in math or science. That, says Camp, is a formula for fewer female entrepreneurs in the years ahead.

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