Investing in women and girls is one of the highest return opportunities available in the developing world, as a wide range of economic research shows. This study by Global Markets Institute demonstrates that bringing more women into the labor force can significantly boost per capita income and GDP growth. Research has also shown that women’s higher propensity to use their earnings and increased bargaining power to buy goods and services that improve family welfare can create a virtuous cycle: female spending supports the development of human capital, which fuels economic growth in the years ahead.