Decline in job satisfaction and how it relates to investment decisions of the self-employed / Joern Block (Trier‐University, Erasmus‐University Rotterdam and University Witten/Herdecke), Miriam Gnad (Trier‐University), Alexander S. Kritikos (DIW‐Berlin, Potsdam University, IZA and GLO), Caroline Stiel (DIW‐Berlin) ; IZA Institute of Labor Economics