Even though they are marginalized throughout the world, investing in women and girls makes the difference. It is estimated that if every girl worldwide received 12 years of quality education, lifetime earnings for women could increase by US $15 trillion. One additional school year can increase a woman's earnings by 10% to 20% toward her future annual income, and adults girls are more likely to invest a far larger percentage of her income back into her family. By investing in girls you are investing in their future, their family's future and their country's future.