scholarly journals Pure numbers effects, market power, and tacit collusion in posted offer markets

2009 ◽  
Vol 72 (1) ◽  
pp. 475-488 ◽  
Author(s):  
Douglas Davis
1994 ◽  
Vol 23 (2) ◽  
pp. 125-139 ◽  
Author(s):  
Ronald W. Cotterill

This paper reviews prior research by agricultural economists on the demand for food products using scanner data. Thereafter, a differentiated product's oligopoly model with Bertrand price competition is developed and used to specify brand level demand and oligopoly price reaction equations. The model has sufficient detail to estimate brand level price elasticities and price response elasticities which in turn can be used to estimate three indices of market power. The first index estimated is the familiar Rothschild Index. The paper develops estimates two new indexes, the observed index and the Chamberlin quotient for tacit collusion. It concludes with comments on how the proposed method for the measurement of market power in a differentiated oligopoly can be improved.


2021 ◽  
pp. 588-612
Author(s):  
Richard Whish ◽  
David Bailey

Oligopoly exists where a few firms between them supply all or most of the goods or services on a market without any of them having a clear ascendancy over the others. The purpose of this chapter is to examine whether oligopoly presents a particular problem for competition policy and, if so, how that problem should be overcome. The chapter discusses the theory of oligopolistic interdependence and how oligopolies can lead to a well-known problem for competition law and policy: oligopolists are able, by virtue of the characteristics of the market, to behave in a parallel manner and to derive benefits from their collective market power without, or without necessarily, entering into an agreement or concerted practice of the kind generally prohibited by competition law. This phenomenon is known in economics as ‘tacit collusion’ and is the result of each firm’s individual and rational response to market conditions. The chapter identifies possible ways of dealing with the ‘oligopoly problem’, before considering the extent to which Articles 101 and 102 can be used to address that problem. The chapter also discusses UK law and, in particular, the possible use of the market investigations to address market failure that may arise in oligopolies.


1990 ◽  
Vol 34 (3) ◽  
pp. 211-214 ◽  
Author(s):  
Douglas D. Davis ◽  
Arlington W. Williams
Keyword(s):  

Pravovedenie ◽  
2019 ◽  
Vol 63 (4) ◽  
pp. 573-597
Author(s):  
Pierre Regibeau ◽  
◽  
Ioannis Lianos ◽  

The article reveals the main problems of antitrust law caused by the widespread use of digital technologies. The greatest challenge brought by the proliferation of digital technology and data is the emergence of new forms of pricing, which do not fit well with our traditional approach to the market definition or with our traditional assessment of the likely effect of mergers on prices. Digital sellers have the ability not only to recognize previous buyers more effectively but also to collect, store and exploit information about this buyer’s past behaviour in order to display products and prices aimed at maximising the seller’s profits given the available buyer profile. Individualised pricing enabled by digitalisation raises issues relative to market definition. In a world where digital sales enable customised pricing, the market is much more liable to segmentation. As a result, one must pay close attention to whether the merging parties are or not “especially close competitors” not only in terms of products but also in terms of consumer information. The authors conclude that AI-based algorithms could be used to facilitate tacit collusion between rivals. Coordination between independent parties is easier to achieve and maintain if the parties can agree on a common price, can detect any deviation from this agreement quickly and precisely and can react to such deviations quickly. Establishing this type of infringement would likely require expertise not currently available to most competition authorities. The article identifies several mechanisms through which the emergence of digital conglomerates, and hence the approval of digital conglomerate mergers, can affect competition adversely. The platform’s “market power” now depends on its ability to retain users within its own ecology and to use this to restrict the supply of advertising, leading to higher prices for both advertising and the corresponding products. This ability is increased by any acquisition which helps populate this ecology. Traditional measures of concentration can therefore easily understate, or even miss entirely, this type of merger-specific increase in market power.


2004 ◽  
pp. 72-81 ◽  
Author(s):  
A. Kuznetsov

Electronic markets are thought to be perfectly efficient in terms of price levels, price dispersion, menu costs and the number of competitive sellers in the market. Indeed, menu costs and prices are usually lower online, but some empirical studies have found that electronic markets are characterised by high price dispersion and high concentration of market power. The author suggests that because of low costs of searching and acquiring information, small number of sellers and low menu costs electronic markets provide better conditions for tacit collusion. The fact that sellers are able to react to competitors' actions faster than buyers may even foster prices to increase. Tighter online competition forces each seller to differentiate from others by advertising his own brand name. In a static equilibrium an increase of the number of buyers may lead to escalation of advertising expenses and force less efficient sellers out of the market.


2017 ◽  
Author(s):  
James Gibson

Despite what we learn in law school about the “meeting of the minds,” most contracts are merely boilerplate—take-it-or-leave-it propositions. Negotiation is nonexistent; we rely on our collective market power as consumers to regulate contracts’ content. But boilerplate imposes certain information costs because it often arrives late in the transaction and is hard to understand. If those costs get too high, then the market mechanism fails. So how high are boilerplate’s information costs? A few studies have attempted to measure them, but they all use a “horizontal” approach—i.e., they sample a single stratum of boilerplate and assume that it represents the whole transaction. Yet real-world transactions often involve multiple layers of contracts, each with its own information costs. What is needed, then, is a “vertical” analysis, a study that examines fewer contracts of any one kind but tracks all the contracts the consumer encounters, soup to nuts. This Article presents the first vertical study of boilerplate. It casts serious doubt on the market mechanism and shows that existing scholarship fails to appreciate the full scale of the information cost problem. It then offers two regulatory solutions. The first works within contract law’s unconscionability doctrine, tweaking what the parties need to prove and who bears the burden of proving it. The second, more radical solution involves forcing both sellers and consumers to confront and minimize boilerplate’s information costs—an approach I call “forced salience.” In the end, the boilerplate experience is as deep as it is wide. Our empirical work should reflect that fact, and our policy proposals should too.


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