Prof. Marcel Bertrand

Prof. Dr. Prof. Prof.

Marcel Arnold * and Marie

EPIDEMIOLOGY Cervical artery dissection accounts for up to 20% of strokes in patients under 30 years of age (Bogousslavsky et al. 1987). The incidence of carotid dissection is about 2–3 per 100 000 per year (Schievink et al. 1993; Giroud et al. 1995); the incidence of cervical dissection must be higher because these fi gures do not take into account vertebral dissection (about 25% of all dissec...

Roman Liepelt1, & Marcel Brass1,2

There is recent evidence that we directly map observed actions of other agents onto our own motor repertoire, referred to as direct matching (Iacoboni et al., 1999). This was shown when we are actively engaged in joint action with others' (Sebanz et al. 2003) and also when observing irrelevant movements while executing congruent or incongruent movements (Brass et al., 2000). However, an open qu...

Bertrand competition

Bertrand competition is a model of competition used in economics, named after Joseph Louis François Bertrand (1822-1900). Specifically, it is a model of price competition between duopoly firms which results in each charging the price that would be charged under perfect competition, known as marginal cost pricing. The model has the following assumptions: There are at least two firms producing ho...

Bertrand Supertraps

We study oligopoly price competition between multiproduct firms, firms whose products interact in the profit function. Specifically, we focus on the impact of intra-firm product interactions on the level of equilibrium profits. This impact is divided into two effects: a direct effect and a strategic effect (i.e., through the competitors’ actions). We derive conditions such that the strategic ef...