The Cournot-Bertrand model and the degree of product differentiation

We consider a duopoly model with a Cournot-type firm and a Bertrand-type firm. Both survive and the equilibrium is stable when there is sufficient product differentiation. With no differentiation, only the Cournot-type firm survives, and the outcome is perfectly competitive.     

Strategic interaction between futures and spot markets

We study an oligopolistic industry where firms are able to sell in a futures market at infinitely many moments prior to the spot market. A kind of Folk-theorem is established: any outcome between perfect competition and Cournot can be sustained in equilibrium. We then find that the Cournot outcome can be sustained by a renegotiation-proof equilibrium. However, this is not true for the competitive outcome. Furthermore, only the monopolistic outcome is renegotiation-proof if firms can buy and sell in the futures market. These results suggest, contrary to existing literature, that the introduction of futures markets may have an anti-competitive effect.     

Vertical product differentiation and entry deterrence

I study how a potential entrant influences quality in a model of vertical product differentiation with quality-dependent production costs. With identical costs, the incumbent will always deter entry if possible, i.e., if fixed costs are high. Quality will be set at a level lower than or equal to the optimal quality under either duopoly or monopoly. Results are completely different when the entrant has substantially lower costs. They are explained by the relative location of the entrant's quality best response to the incumbent's optimal quality choice in monopoly. This sheds new light on the influence of industrial policy on market conduct.     

Asymmetric access price regulation in telecommunications markets

In liberalized telecommunications markets, the incumbent typically enjoys several advantages over any entrant. Regulation in such asymmetric markets stimulates competition in the short and the long term if retail prices are low and the entrant's profits are high so that entry is encouraged. I show that asymmetric access price regulation with a cost-based access price for the incumbent and an access markup for the entrant is more successful than cost-based access price regulation applied to incumbent and entrant. This is a robust prediction with respect to the pricing strategies considered. Such asymmetric access price regulation is in accordance with European legislation.     

On Stackelberg games in a homogeneous product market

In a homogeneous product duopoly with concave demand and strictly convex costs we bring together all the standard results of quantity Stackelberg games, provide some new results with price Stackelberg games and compare the equilibrium configuration of the quantity games with the price games. In the price Stackelberg game we show there is a unique SPNE where the leader chooses a lower price than the follower, but both get equal payoffs. We prove that generally quantity Stackelberg games are less competitive than price Stackelberg games. However, we also demonstrate the possibility of a reversal of this result.     

Certification of corporate social responsibility activities in oligopolistic markets

Abstract We investigate the impact of alternative certifying institutions on firms’ incentives to engage in costly Corporate Social Responsibility (CSR) activities as well as their relative market and societal implications. We find that the CSR certification standard is the lowest under for‐profit private certifiers and the highest under a Non Governmental Organization (NGO), with the standard of a welfare‐maximizing public certifier lying in between. Yet, regarding industry output, this ranking is reversed. Certification of CSR activities is welfare enhancing for consumers and firms and should be encouraged. Finally, the market and societal outcomes of CSR certification depend crucially on whether certification takes place before or after firms’ CSR activities.     

Welfare effects of competitive lobbying efforts in international oligopoly markets

Conventionally, rent-seeking activities have been considered to deteriorate social welfare and to distort resource allocation. This paper examines whether rent-seeking behavior can improve social welfare by focusing on the welfare effects of firms’ competitive lobbying efforts when governments can impose market entry regulation against foreign firms. We demonstrate that competitive lobbying efforts can improve social welfare when such lobbying efforts are directed to reduce market entry barriers. In addition, social welfare can be maximized when the government shows the maximum sensitivity to the foreign firm's political contributions while maintaining competitive market structure. Moreover, it is shown that the dominant strategy for a domestic firm is to allocate more resources to R&D sectors while it is optimal for foreign firms is to exert more efforts in lobbying to reduce the market entry barriers when a government makes political economic approach in market entry regulations.     

Vertical integration, raising rivals’ costs and upstream collusion

This paper analyzes the impact vertical integration has on upstream collusion when the price of the input is linear. As a first step, the paper derives the collusive equilibrium that requires the lowest discount factor in the infinitely repeated game when one firm is vertically integrated. It turns out this is the joint-profit maximum of the colluding firms. The discount factor needed to sustain this equilibrium is then shown to be unambiguously lower than the one needed for collusion in the separated industry. While the previous literature has found it difficult to reconcile raising-rivals’-costs strategies following a vertical merger with equilibrium behavior in the static game, they are subgame perfect in the repeated game studied here.     

Efficiency enhancing taxation in two-sided markets

This paper examines the efficient provision of goods in two-sided markets and characterizes optimal specific and ad-valorem taxes. We show that (i) a monopoly may have too high output compared to the social optimum; (ii) output may be reduced by imposing negative value-added taxes (subsidy) or positive specific taxes.     

Bargaining and separation costs in two-sided markets

A two-sided market is characterized by contract negotiations, bilateral exchanges between buyers and sellers. Separation costs endow trading partners with monopoly power, rendering this a market of bilateral monopolistic competition. Market equilibrium is defined by these negotiations, a matching of the two sides, and a set of prices; the costs of disagreement are endogenous. A bargaining strategy some players use is commitment to a position. Disagreements are possible and, contrary to the case of bilateral monopoly, these disagreements are not always inefficient.     

Environmental taxation and mergers in oligopoly markets with product differentiation

We analyze the effect of mergers on optimal environmental taxation in a Cournot oligopoly market with product differentiation. Our result indicates that the adjustment in emission tax crucially depends on the post-merger output distortion and pollution intensities. Specifically, we find that the optimal emission tax increases post-merger as long as pollution intensity of firms is higher and output distortion smaller post-merger than pre-merger. Furthermore, our result suggests that there is no need to revise environmental policy in markets where pollution intensity of firms does not change post-merger and (i) products are completely differentiated, or (ii) there are many firms for any degree of product differentiation.     

Competition and waiting times in hospital markets

This paper studies the impact of hospital competition on waiting times. We use a Salop-type model, with hospitals that differ in (geographical) location and, potentially, waiting time, and two types of patients: high-benefit patients who choose between neighbouring hospitals (competitive segment), and low-benefit patients who decide whether or not to demand treatment from the closest hospital (monopoly segment). Compared with a benchmark case of monopoly, we find that hospital competition leads to longer waiting times in equilibrium if the competitive segment is sufficiently large. Given a policy regime of hospital competition, the effect of increased competition depends on the parameter of measurement: Lower travelling costs increase waiting times, higher hospital density reduces waiting times, while the effect of a larger competitive segment is ambiguous. We also show that, if the competitive segment is large, hospital competition is socially preferable to monopoly only if the (regulated) treatment price is sufficiently high.     

Vertical distribution, parallel trade, and price divergence in integrated markets

We develop a model of vertical pricing in which an original manufacturer sets wholesale prices in two markets that are integrated at the distributor level by parallel imports (PI). The manufacturing firm needs to set these two prices to balance three competing interests: restricting competition in the PI-recipient market, avoiding resource wastes due to actual trade, and reducing the double-markup problem in the PI-source nation. These tradeoffs imply the counterintuitive result that retail prices could diverge as a result of declining trading costs, even as the volume of PI increases. Thus, in some circumstances it may be misleading to think that permitting PI is an unambiguous force for price integration.     

Signaling in markets with two-sided adverse selection

Summary. The paper analyzes an economy with two-sided adverse selection, focusing on equilibria that satisfy a refinement based on the notion of strategic stability. In the familiar case of one-sided adverse selection, agents reveal all of their private information as long as the contract space is rich enough. However, with two-sided adverse selection, the sufficient conditions for separation are much stronger. Received: September 3, 1999; revised version: December 3, 1999     

Globalization,product differentiation,and wage inequality

Abstract This paper develops a two‐country, general equilibrium model of oligopoly in which the degree of horizontal product differentiation is endogenously determined by firms’ strategic investments in product innovation. Consumers seek variety and product innovation is more skill intensive than production. Stronger import competition increases innovation incentives, and thereby the relative demand for skill. An intra‐industry trade expansion following trade liberalization can therefore increase wage inequality between skilled and unskilled workers. As long as some industries remain shielded from international competition, the welfare implications of globalization are found to be generally ambiguous.     

Modelling price competition across many markets (An application to the Spanish loans market)

The purpose of this work is the structural modelling of price competition in a product-differentiated industry in which many firms of varying size compete across many independent small markets, with the target of identifying price behaviour. We apply it to model competition among the more than 79 banks that were active in the Spanish loans market during the period 1983-1991, using micropanel data. A model in which national banks (as opposed to regional and local banks) fully internalize their cross-rate effects in pricing is selected as the model that best fits the data. Our framework allows us to estimate the dead-weight loss due to market power, and to decompose it assessing the part attributable to price coordination.     

The impact of bargaining on markets with price takers: Too many bargainers spoil the broth

In this paper we study how bargainers impact on markets in which firms set a list price to sell to those consumers who take prices as given. The list price acts as an outside option for the bargainers, so the higher the list price, the more the firms can extract from bargainers. We find that an increase in the proportion of consumers seeking to bargain can lower consumer surplus overall, even though new bargainers receive a lower price. The reason is that the list price for those who do not bargain and the bargained prices for those who were already bargaining rise: sellers have a greater incentive to make the bargainers’ outside option less attractive, reducing the incentive to compete for price takers. Competition Authority exhortations to bargain can therefore be misplaced. We also consider the implications for optimal seller bargaining.     

Parallel trade,product quality,and welfare

We study the welfare effects of parallel trade (PT) considering investment in quality. We thus revisit the case for PT in research-intensive industries. We find that PT may raise quality, depending on how preferences for quality differ across countries. Conditional on quality, consumer surplus may rise (fall) in the PT-source (PT-recipient) country. While PT reduces ex post welfare, improving quality is a necessary condition for PT to increase welfare ex ante.     

Open‐shop unions and product market competition

Abstract Evidence on the effect of product market competition on unionized wages is mixed. In this paper we show theoretically that the result may reflect genuine heterogeneity in the response of union wages to product market conditions. For low levels of unionization, union bargaining power may actually be enhanced by market competition, as firms have more to lose when there is a strike. Using recent data from the UK, we explore interactions between the level of industry competition and unionization, and find supporting evidence for this hypothesis.     

Product differentiation, process R&D, and the nature of market competition

We investigate the relationship between process and product R&D and compare the incentives for both types of R&D under different modes of market competition (Bertrand versus Cournot). It is shown that: (i) process R&D investments increase with the degree of product differentiation and firms invest more in product R&D when they can do process R&D than when they cannot; (ii) Bertrand firms have a stronger incentive for product R&D whereas Cournot firms invest more in process R&D; and (iii) cooperation in product R&D promotes both types of R&D relative to competition whereas cooperation in both types of R&D discourages R&D relative to cooperation in just product R&D.