We propose both a monopoly and a duopoly model of a two-sided market. Both settings are fully comparable, as we impose a homogeneous good produced at zero costs without capacity constraints, as well as identical parameterization of market sizes. We determine the duopoly equilibrium and the...

We make a case for price-increasing competition on “competitive bottleneck” two-sided markets. Unlike previous literature on price-increasing competition and two-sided markets, we abstract from product/platform differentiation, structural differences, scale effects, search costs, and...

The literature on the effects of market concentration in platform industries or two-sided markets often compares the competitive outcome against a benchmark. This benchmark is either the “joint management” solution in which one decision maker runs all platforms or a “pure” monopoly with...

Can a monopoly persist by expanding its operation to a new market after strategically bidding for an exclusive license under the threat of supply function competition with a potential entrant? The answer may be yes or no depending on how the monopolist's existing product and the new product are...

We study a market in which several firms potentially each supply a number of "brands" of fundamentally the same product. In fashion, for example, a single firm might retail similar items under different labels and different prices. Consumers differ in which products they consider for their...

We study the effect of distortionary taxes on three types of market structure: Cournot duopoly, Stackelberg duopoly, and a monopoly under a collusive agreement between the two rival firms in the industry. We investigate different tax regimes such as a per unit tax, an ad valorem tax and a tax on...

We study pricing by multiproduct firms in the context of unregulated monopoly, regulated monopoly and Cournot oligopoly. Using the concept of consumer surplus as a function of quantities (rather than prices), we present simple formulas for optimal prices and show that Cournot equilibrium exists...

In this paper, we tackle the dilemma of pruning versus proliferation in a vertically differentiated oligopoly under the assumption that some firms collude and control both the range of variants for sale and their corresponding prices, likewise a multi-product firm. We analyse whether pruning...

There is limited theoretical understanding of cost pass-through within markets where prices are dispersed. Under a general demand function, we analyse the effects of cost changes in a seminal model of price dispersion, where some consumers are captive to particular sellers while others are not...

This paper extends Armstrong, Vickers, and Zhou (2007) to the case with multiple prominent firms. All consumers first search among prominent firms, and if their products are not satisfactory, they continue to search among non-prominent ones. Prominent firms will charge a lower price than their...