In countries, such as Singapore, that have implemented vehicle congestion policies, recent years have seen a shift towards motor vehicle taxes based on car use. Ownership taxes reduce the number of cars on the road, leaving the price per trip largely unaffected. Use taxes such as fuel taxes and...

We propose a theory-inspired measure of the accessibility of a city's center: the size of the surrounding area from which it can be reached within a specific time. Using publicly available optimal-routing software, we compute these "accessibility zones" for the 109 largest US and European...

In seinem Kommentar setzt sich Hans Willgerodt, ehemals Universität zu Köln, kritisch mit der Griechenlandhilfe der Euroländer auseinander, hinterfragt den Erfolg der Maßnahmen und analysiert die damit verbundenen Wirkungen.