The present dissertation is a synopsis of most of the research that I undertook during my time as a teaching and research assistant at the Chairs of Economic Policy of the Universities of Duisburg-Essen and Dortmund. Writing this thesis on the impact of profit sharing as a wage incentive taught me a lot about individual and group incentives, about intrinsic and extrinsic motivation not only on a theoretical level but also in the hands-on experience of completing this thesis. But above all it taught me about the importance of cooperation: I am indebted to numerous people and institutions that have contributed to the completion of my dissertation project in many ways. I would like to thank, first and foremost, my academic teacher Prof. Dr. Kornelius Kraft for many inspiring discussions and his continuous encouragement and help through all stages of my work. I also thank my second referee, PD Dr. Uwe Jirjahn, for many helpful comments and suggestions in particular during the final stages of this work, and Prof. Dr. Wolfgang Leininger for his readiness to participate in my PhD committee.