2 IZA Discussion Papers
IZA Discussion Paper No. 4037
published in: Dani Rodrik and Mark Rosenzweig (eds.), Handbook of Development Economics, Vol. 5, The Netherlands: North-Holland, 2010, 4283-4362.
IZA Discussion Paper No. 3186
published in: Brookings Papers on Economic Activity, 2007 (1), 153-230