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Julie Berry Cullen is professor of economics at University of California, San Diego and research associate at NBER.

Eric A. Hanushek is Paul and Jean Hanna Senior Fellow in Education, Hoover Institution, Stanford University, senior research fellow at University of Texas at Dallas, and research associate at NBER.

Gregory Phelan is assistant professor of economics at Kennesaw State University.

Steven G. Rivkin is professor of economics at University of Illinois at Chicago, senior research fellow at University of Texas at Dallas, and research associate at NBER.

Scott Cunningham is at Baylor University.

Gregory DeAngelo is at Claremont Graduate University.

John Tripp is at Clemson University.

Tobias Cagala is an economist at Deutsche Bundesbank.

Ulrich Glogowsky is a professor of economics at Johannes Kepler University Linz.

Johannes Rincke is a professor of economics at University of Erlangen-Nuremberg.

Esther Gehrke is an Assistant Professor at Wageningen University and Research, Agricultural Economics and Rural Policy, Wageningen, The Netherlands.

Christoph Kubitza is a Research Fellow at the German Institute for Global and Area Studies (GIGA), Hamburg, Germany.