is a fellow for Future Perfect , Vox’s section on making the world a better place. She writes about global health, philanthropy, labor, and social movements. Remittances have been proven to reduce infant mortality, boost school enrollment, and fuel housing construction around the world. Ernesto Benavides/AFP via Getty Images Immigrant rights activist Guerline Jozef can’t count the number of frantic texts, calls, and emails she gets daily from Haitians in the United States terrified that some day soon, they won’t be able to feed their families anymore. Not just those in the US, but their “mother, sister, niece, a cousin,...