We investigate how different types of merger affect input prices, research levels and equilibrium profits in vertical market structures when there is research activity in the upstream market that spills over to the downstream retailers. To do so, we develop a very simple model where three...

In a model of spatial competition, we show that complementarities can benefit the parties to a merger more than any outsiders thus leading to higher concentration. The driving force is the negative demand externality imposed by the merging firms on the non-merging units in the same locations,...

We investigate how a downstream merger affects input prices and equilibrium profits when there are price interdependencies among firms. To do so, we develop a very simple model where different inputs, provided by monopolist suppliers, may be combined to produce differentiated products sold by...

We take a general model of externalities matching the Cooper & John framework with identical agents. If each agent's payoff depends on a parameter interpreted as the favourableness of the environment, we explore how the number of Nash equilibria varies with this parameter, especially in the...