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RWI—Leibniz Institute for Economic Research, Essen, Germany; Ruhr University Bochum, Bochum, Germany;

RWI, Essen, Germany;

RWI, Essen, Germany; Bochum University of Applied Sciences, Germany;

RWI, Essen, Germany; Jacobs University, Bremen, Germany:

Department of Economics, University of Kansas, Lawrence;

School of Economics, University of Queensland, Brisbane, Australia;

Department of Agricultural Economics and Rural Development, University of Göttingen, Germany;

Department of Agricultural Economics and Rural Development, University of Göttingen, Germany;

Department of Agricultural Economics and Rural Development, University of Göttingen, Germany; Institute for Food and Resource Economics, University of Bonn, Germany;

Department of Economics, University of Birmingham, United Kingdom;

Department of Economics, University of Birmingham, United Kingdom;

Department of Economics, University of Birmingham, United Kingdom;