Measuring indirect effects of unfair employer behavior on worker productivity: a field experiment / Matthias Heinz (University of Cologne and CEPR), Sabrina Jeworrek (Halle Institute for Economic Research and Otto von Guericke University Magdeburg), Vanessa Mertins (University of Vechta), Heiner Schumacher (KU Leuven), Matthias Sutter (MPI for Research on Collective Goods, University of Cologne, CESifo and IZA) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, November 2017