We examine the bipartite graphs of German corporate boards in 1993, 1999 and 2005, and identify cores of directors who are highly central in the entire network while being densely connected among themselves. The novel feature of this paper is the focus on the dynamics of these networks....

This paper studies externalities of nationally determined cost-sharing systems, in particular coinsurance rates (patients pay a percentage of the price), under pharmaceutical parallel trade in a two-country model with a vertical distributor relationship. Parallel trade generates a...

This paper studies the effect of pharmaceutical regulation at the wholesale level, if markets are integrated by parallel trade, i.e. trade outside the manufacturer´s authorized distribution channel. In particular, maximum wholesale margins, a restriction of pricing by the intermediary, and...

This paper analyzes the consequences of parallel trade on health care systems in a two-country model with a vertical distributor relationship. In particular, two cost-sharing systems - coinsurance and indemnity insurance - are compared with respect to changes in copayments and public health...

This paper analyzes a maximum price system and a reference price system in a vertical differentiation model with a brand-name drug and a generic. In particular, both instruments are compared with respect to their performance in reducing public expenditure, limiting financial exposure of...

Do you believe that at Christmas time the gas prices, the economy and the number of suicides peak? Do you think that the value of presents you are giving to your beloved is of importance? We show in this paper that conventional wisdom about Christmas is often doubtful. Furthermore, we give an...

This paper studies the effect of a minimum quality standard, a compulsory labeling scheme, and the combination of both instruments in a vertical differentiation model when not all quality dimensions of products can be observed byconsumers. Both a minimum quality standard on the non-observable...

This paper studies the effect of non-compliance with a minimum quality standard on prices, quality, and welfare in a vertical differentiation model. Non-compliance with a minimum quality standard by a low-quality firm reduces quality levels of both firms, increases the price for the high-quality...

This paper studies the interaction of a minimum quality standard and exports in a vertical product differentiation model when firms sell global products. If exante quality of foreign firms is lower (higher) than the quality of exporting firms, a mild minimum quality standard in the home market...

This paper models different external reference pricing schemes - a price cap based on the drug price in one or two countries and on the minimum or average drug price - in a three-country framework. It studies the choice of external reference pricing schemes in one country as well as its effect...