Women are 50% more likely to start businesses than the national average, yet are 70% less likely than men to own a business with revenue of $1 million-plus, according to The <a href="http://www.forbes.com/companies/american-express/">American Express</a> OPEN <a href="http://media.nucleus.naprojects.com/pdf/WomanReport_FINAL.pdf">State of Women-Owned Business Report</a>.