He studied and finally earned a doctorate in economics and political sciences from Eberhard Karls University of TÃ 1\/4 bingen . There , he was a scientific research assistant at the Institute for Applied Economic Research from 1969 to 1976 . He studied and finally earned a doctorate in economics and political sciences from Eberhard Karls University of TÃ 1\/4 bingen , where he was a scientific research assistant at the Institute for Applied Economic Research from 1969 to 1976 .