[1] Leuphana Univ Luneburg, Econ, Luneburg, Germany
[2] IWH, Halle, Germany
[3] IZA, Bonn, Germany
[4] Bayreuth Univ, Econ, Bayreuth, Germany
[5] Inst Employment Res IAB, Nurnberg, Germany
[6] London Sch Econ, Econ, London, England
[7] Ctr Econ Performance LSE, Community Programme, London, England