The researchers surmised this was a problem of communication, more than anything else; the information wasn’t reaching the students and families it needed to reach, and in the cases when it did, it wasn’t as clear and useful as it could be. Hoxby and Sarah Turner, an economics professor at the University of Virginia, tested whether they could change enrollment patterns. From 2010 to 2012, Hoxby’s team sent out personalized, detailed packets encouraging the high-achieving, low-income students to apply to several schools and providing application-fee waivers and financial-aid i...