PhD in economics, Yale University, 1970. Henry R. Luce Professor of Jurisprudence (Law and Political Science), Yale University, USA. Fellow, Wissenschaftskolleg zu Berlin, Sciences Po, Center for Advanced Study in the Behavioral Sciences in Palo Alto, Collegium Budapest. Visiting research scholar, World Bank, Washington, DC, 1995-1996. Assistant professor, University of Pennsylvania, 1972-1974