In the 2020 presidential race, candidates have proposed plans to reform higher education. On this hour of “Think,” we’ll talk about affordability, accessibility, and attrition problems when it comes to attending universities and look at whether free college is a viable option to solve these problems. Guests include Matthew M. Chingos, vice president at the Urban Institute Center on Education Data and Policy, journalist Paul Tough, and Anthony A. Jack,assistant professor of education at Harvard.