Have you ever wondered how your telephone company or Internet service provider can give you access to almost all people in the world, or how electricity suppliers can compete with each other if there is only one electric supply line passing through your street? This Element deals with the...

The European airport industry is subject to various forms of economic regulation and there is debate as to which of the systems provides the best incentives for allocative and productive efficiency. This paper deals with the applicability of benchmarking as a regulatory tool for airports. This...

The motion of individual Brownian particles is observed using the confocal Tracking Microscope recently introduced by Schätzel (K. Schätzel, W. G. Neumann, J. Müller and B. Materzok, App. Opt. 31 (1992) 770–778). Particles are laterally trapped in a strongly focused laser beam. By...