In this paper we consider a two-stage duopoly game where firms first decide whether to invest in advertising and then compete in prices. Advertising has two effects : a market enlargement for both firms and a predatory gain for the investing firm only. Both symmetric and asymmetric equilibria...

<marquage typemarq="gras"/> We investigate positional effects in a vertically differentiated duopoly, evaluated against the first best. Positional concerns distort the allocation of consumers across varieties, as well as the average quality. If the external effect is sufficiently relevant, the resulting welfare loss is...