This study was accepted as a doctoral thesis by the Department of E- nomics of the Johann Wolfgang Goethe-University in Frankfurt/Main. It was undertaken within the research project The E?ects of Job Creation and Structural Adjustment Schemes on the Participating Individuals, which was conducted by the Institute of Statistics and Econometrics (Empirical E- nomic Research) in cooperation with the Institute for Employment Research in Nuremberg. I have to thank numerous people. First of all my thesis supervisor, Prof. Dr. Reinhard Hujer, for initiating this thesis and providing me with a great...