JOHN GROENEWEGEN is Professor of Economics of Infrastructures at Delft University of Technology, The Netherlands, and research fellow of the Tinbergen Institute (TI) of the Rotterdam School of Economics. His research interests are in economic organization and the relation between institutions and technology. ANTOON SPITHOVEN is Assistant Professor at the Utrecht University School of Economics, The Netherlands, where he is a member of the chair Institutional economics. His current research interests center on issues of aging of population and health care. ANNETTE VAN DEN BERG is Assistant Professor at the Utrecht University School of Economics, The Netherlands where she is a member of the chair Institutional economics. Her main research interests concern corporate governance issues, notably the role of worker participation