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...

Designing public transport networks involves tradeoffs between extensive geographic coverage, frequent service on each route, and relying on interconnections as opposed to direct service. These choices, in turn, depend on individual preferences for waiting times, travel times, and transfers. We...

Traffic fatalities are the leading cause of mortality in the United States despite being preventable. While several policies have been introduced to improve traffic safety and their effects have been well documented, the role of transitory health shocks or situational factors at explaining...

Developing country megacities suffer from severe road traffic congestion, yet the level of congestion is not a direct measure of equilibrium inefficiency. I study the peak-hour traffic congestion equilibrium in Bangalore. To measure travel preferences, I use a model of departure time choice to...

Die Deutsche Bahn wird nach ihrer finanziellen Sanierung Mitte der neunziger Jahre sowohl 2001 als auch 2002 wieder hohen Geschäftsverlusten entgegensehen. Einer der Gründe für die prognostizierte unbefriedigende finanzielle Entwicklung sind ungenügende Fortschritte im Bereich der...

The North Dakota Railroad War of 1905, which pitted a potential entrant (the Soo Line) against an established monopolist incumbent (the Great Northern Railway), offers a lucid empirical example of strategic behavior, and in particular the potential for entry deterrence through product...

The social costs of pollution and climate change hinge critically on humans' ability to adapt. Based on transaction records from the world's largest payment network, this research compiles daily travel flows and documents that China's rapid expansion of high-speed railways (HSR) facilitates the...

"We evaluate multiple variants of a commonly used intervention to boost education in developing countries -- the conditional cash transfer (CCT) -- with a student level randomization that allows us to generate intra-family and peer-network variation. We test three treatments: a basic CCT...

Parteien und Wirtschaft plädieren für einen Subventionsabbau - nicht zuletzt zur Sanierung der öffentlichen Haushalte. Zur Debatte stehen eine flächendeckende Einzelfallprüfung oder die Kürzung aller Subventionen und Steuervergünstigungen um einen bestimmten Prozentsatz. Für Prof. Dr....

In December 2023, the Biden-Harris Administration released a proposed framework for exercising government "march-in" rights on high-priced taxpayer-funded drugs. While both proponents and critics of the new rules view them as having broad scope, march-in rights can be exercised only on patents...