1 Christopher Avery is the Roy E. Larsen Professor of Public Policy at the Harvard Kennedy School, Harvard University, Cambridge, MA, USA. chris_avery@harvard.edu.
2 Susan Dynarski is a University Professor of Diversity and Social Transformation at the Ford School of Public Policy, School of Education and Department of Economics, University of Michigan, Ann Arbor, MI, USA. dynarski@umich.edu.
3 Sarah Turner is a University Professor in the Department of Economics and Education and the Souder Family Chair at the University of Virginia, Charlottesville, VA, USA. sturner@virginia.edu.