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WASHINGTON, DC - DECEMBER 01: Bill Gates, co-chairman of the Bill & Melinda Gates Foundation, participates in a panel discussion during the Financial Inclusion Forum December 1, 2015 at the Treasury Department in Washington, DC. Department of the Treasury and the U.S. Agency for International Development (USAID) held the forum to discuss "ways to foster greater access to safe and affordable financial services for everyone." (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - DECEMBER 01:  Bill Gates, co-chairman of the Bill & Melinda Gates Foundation, participates in a panel discussion during the Financial Inclusion Forum December 1, 2015 at the Treasury Department in Washington, DC. Department of the Treasury and the U.S. Agency for International Development (USAID) held the forum to discuss "ways to foster greater access to safe and affordable financial services for everyone."  (Photo by Alex Wong/Getty Images)