The IPAT-model developed by Ehrlich and Holdren is widespread in ecological economics in order to quantify the impact of population growth on environmental deterioration. We comment on this model and extensions proposed by several authors from a theoretical and empirical point of view.

In dem Beitrag erfolgt eine Analyse der Erreichbarkeit von Arbeitsplätzen in Schleswig-Holstein anhand verschiedener Messkonzepte. Die Untersuchung basiert auf einer Diplomarbeit, die am Institut für Regionalforschung der Christian-Albrechts-Universität zu Kiel entstanden ist. Die für die...

Research and development (R&D) indicators are increasingly used not only to facilitate international comparisons, but also as targets for policies stimulating research. An example of such an indicator is R&D intensity. The decomposition method of R&D intensity was conceived with the aim of...