I revisit the relation between aftermarket power and basic market competition. I consider an infinite period model with overlapping consumers: in each period, one consumer is born and joins one of the existing installed bases, then aftermarket payoffs are received by sellers and consumers, then...

Ranking have become increasingly popular on markets for study programs, restaurants, wines, cars, etc. This paper analyses the welfare implication of such rankings. Consumers have to make a choice between two goods of unknown quality with exogenous presence or absence of an informative ranking....

Researchers debate whether environmental investments reduce firm value or can actually improve financial performance. We provide some first evidence on shareholder wealth effects of voluntary corporate environmental initiatives. Companies announcing membership in Climate Leaders and Ceres - two...

What should be the West's top priority for climate-change policy? This article is a revised and updated version of my talk to the Potsdam Global Sustainability Symposium (which drafted the Potsdam Declaration presented to the 2007 UN Climate Change Conference in Bali).

We analyze a dynamic stochastic general-equilibrium (DSGE) model with an externality---through climate change---from using fossil energy. A central result of our paper is an analytical derivation of a simple formula for the marginal externality damage of emissions. This formula, which holds...

In traditional Keynesian and neoclassical models, the transmission of product demand changes to the labour market generally involves wage-price sluggishness or counter-cyclical real wage movements. In practice, however, real wages are often acyclical or procyclical, and wages and prices are...

This paper is a reflective survey of past and recent econometric work on the growth of firms. Most of this work suggests that firm size follows a random walk; i.e. that corporate growth rates are random. The survey documents this, and shows what a strong result this is by contrasting it with...

The deregulation of the telecommunications industry has resulted in a variety of industry structures which have been created in the hope of increasing competition. One example is the licensing of cellular telephone services in the United States. In the face of scarce radio spectrum, the Federal...

This paper studies the impact that capital market imperfections have on the natural selection of the most efficient firms by estimating the effect of the pre-deregulation level of leverage on the survival of trucking firms after the Carter deregulation. Highly leveraged carriers are less likely...

In this paper we specify and estimate a structural model of competition for the European airline industry to assess the potential for price reductions if competition increases. The model has two distinguishing features: First, we allow for firms to make short- and long-run decisions by...