A marketplace such as Amazon hosts many products by third party sellers and acts as a first
party or private label retailer. Assuming an advantage of Amazon in logistics and of sellers in …

Competition and intellectual property (IP) protections are complements in stimulating
innovation. When IP is appropriable, a market for inventions forms and competitive …

We compile an IO toolkit for aggregative games with positive and normative comparative
statics results for asymmetric oligopoly in the short and long run. We characterize the class …

Most market structures are neither perfectly or monopolistically competitive: they are
characterized by a few large firms that are engaged in strategic interactions in their …

We show that cost asymmetry between the domestic and foreign firms is not necessary for
the occurrence of insufficient entry in the domestic country. This result provides a rationale …

We examine the welfare effects of entry in the presence of network externalities. We show
that if network goods are fully incompatible, entry is socially insufficient as long as the entry …

We consider social efficiency of firm-entry in the presence of foreign competition. If the
labour markets are competitive, entry is insufficient for the domestic country if the …

The so‐called excess‐entry theorem establishes conditions guaranteeing that more firms
enter a homogeneous Cournot‐oligopoly in equilibrium than a benevolent government …

This paper examines how the order of the firms' moves affects the social efficiency with
foreign ownership and free entry in a mixed oligopoly market. We firstly show that when the …

We revisit the social desirability of entry in a vertical structure by showing that, if the input
supplier has market power, social desirability of entry of downstream producers depends on …