I have acted as a referee for many journals; e.g. for the International Economic Review, the European Economic Review, the Canadian Journal of Economics and the Journal of Development Economics. I have been invited to give lectures at many universities, e.g.: the London School of Economics, Yale, the University of Pennsylvania, Queen's in Canada, Boston College etc.
My main research area is the theory of international trade and investment inclusive of international economy policy and applications thereof. Recently I have also carried out research on public goods and envrionemental economics. With regard to applications I was the leader of a research project on foreign investment and joint ventures in China. This project was officially sponsored by the D.F.G., the German Research Union (like the SSRC in the UK). Another research project of mine was concerned with transformation problems in Eastern Europe with special emphasis on political economy aspects. This was supported by a grant from the Volkswagen-Foundation. A more recent research project was concerned with a theoretical and applied analysis of special economic zones again with special reference to the P. R. of China. This was also supported by the Volkswagen-Foundation.
My most recent research interest focuses on the introduction of entrepreneurship into models of monopolistic competition and applications thereof, such as a novel explanation of de-industrialisation and the forming of vested interest groups from a political eocnomic perspective.
During the last thirty-five years, I supervised approximately forty Ph.D. students. At present I supervise one Ph.D. student. He works on the following topic: the theory and the applications of monopolistic competition in international trade.
Ranking in Germany:
According to the ranking of Top-Emeriti in economics by the Handelsblatt in 2008, I was ranked in third place after Reinhard Selten and Werner Hildenbrand of University of Bonn.