Notes, Comments and Preliminary results Dec 30 2023 Olaf Hübler   Donations, volunteering, and life satisfaction in Germany   Abstract  Contact Information  Citation  Full Text  -  Note   Mar 31 2014 Lutz Bellmann , Hans-Dieter Gerner and Olaf Hübler   Effects of reciprocal concessions on employment and real capital   Abstract  Contact Information  Citation  Full Text  -  Note