Doctor of Philosophy, Docent Stockholm School Economics, University Stockholm, 1964, 1970, 1971.
Professor of Economics, University, Stockholm, since 1970. Editor, Swedish Journal of Economics, 1968-1972. Association Editor, Journal of Public Economics, since 1983.
Contributions to externality theory and to the analysis of environmental policy. Public goods: theory, methods for revealing preferences and experimental applications. Comprehensive analysis of deposit-refund systems: theory and applications.
Concise introductory textbook on welfare theory. Contributions to second-best theory. Analysis of price stabilisation schemes.
Allocative efficiency of different ways of organising the credit market. Cost-benefit analysis of industrial projects and policy proposals in Sweden. Economic theory of transportation policy.