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Convex Analysisの二,三の進展について

Many if not most markets with network externalities are two-sided. To succeed, platforms in industries such as software, portals and media, payment systems and the Internet, must “get both sides of the market on board.” Accordingly, platforms devote much attention to their business model, that is, to how they court each side while making money overall. This paper builds a model of platform competition with two-sided markets. It unveils the determinants of price allocation and end-user surplus for different governance structures (profit-maximizing platforms and not-for-profit joint undertakings), and compares the outcomes with those under an integrated monopolist and a Ramsey planner. (JEL: L5, L82, L86, L96)

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Platform competition in two‐sided markets

The paper provides a road map to the burgeoning literature on two-sided markets and presents new results. It identifies two-sided markets with markets in which the structure, and not only the level of prices charged by platforms matters. The failure of the Coase theorem is necessary but not sufficient for two-sidedness. The paper builds a model integrating usage and membership externalities, that unifies two hitherto disparate strands of the literature emphasizing either form of externality, and obtains new results on the mix of membership and usage charges when price setting or bargaining determine payments between end-users.

/pdf/two-sided-markets-a-progress-report-40yp4ugn2p.pdf

Two-sided markets: a progress report

Economics has much to do with incentives--not least, incentives to work hard, to produce quality products, to study, to invest, and to save. Although Adam Smith amply confirmed this more than two hundred years ago in his analysis of sharecropping contracts, only in recent decades has a theory begun to emerge to place the topic at the heart of economic thinking. In this book, Jean-Jacques Laffont and David Martimort present the most thorough yet accessible introduction to incentives theory to date. Central to this theory is a simple question as pivotal to modern-day management as it is to economics research: What makes people act in a particular way in an economic or business situation? In seeking an answer, the authors provide the methodological tools to design institutions that can ensure good incentives for economic agents. This book focuses on the principal-agent model, the "simple" situation where a principal, or company, delegates a task to a single agent through a contract--the essence of management and contract theory. How does the owner or manager of a firm align the objectives of its various members to maximize profits? Following a brief historical overview showing how the problem of incentives has come to the fore in the past two centuries, the authors devote the bulk of their work to exploring principal-agent models and various extensions thereof in light of three types of information problems: adverse selection, moral hazard, and non-verifiability. Offering an unprecedented look at a subject vital to industrial organization, labor economics, and behavioral economics, this book is set to become the definitive resource for students, researchers, and others who might find themselves pondering what contracts, and the incentives they embody, are really all about.

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The Theory of Incentives: The Principal-Agent Model

There are many examples of markets involving two groups of participants who need to interact via intermediaries. Moreover, these intermediaries usually have to compete for business from both groups. Examples include academic publishing (where journals facilitate the interaction between authors and readers), advertising in media markets (where newspapers or TV channels enable adverts from producers to reach consumers), payment systems (where credit cards can be a convenient method of transaction between consumers and retailers), and telecommunications networks (where networks are used to provide links between callers and those who receive calls). The paper surveys recent theoretical work on these two-sided markets. The main questions are (i) what determines which side of the market is subsidized (if either) in order to attract the other side, and (ii) is the resulting outcome socially e¢cient?

https://mpra.ub.uni-muenchen.de/42863/1/MPRA_paper_42863.pdf

Competition in Two-Sided Markets ¤

We analyze a model of imperfect price competition between intermediation service providers. We insist on features that are relevant for informational intermediation via the Internet: the presence of indirect network externalities, the possibility of using the nonexclusive services of several intermediaries, and the widespread practice of price discrimination based on users' identity and on usage. Efficient market structures emerge in equilibrium, as well as some specific form of inefficient structures. Intermediaries have incentives to propose non-exclusive services, as this moderates competition and allows them to exert market power. We analyze in detail the pricing and business strategies followed by intermediation services providers. Copyright 2003 by the RAND Corporation.

/pdf/chicken-and-egg-competition-among-intermediation-service-53qo1tzw1k.pdf

Chicken and egg: competition among intermediation service providers

National Science Foundation, the Commissariat General du Plan, and the Center for Energy Policy Research at M.I.T.

/pdf/government-intervention-in-production-and-incentives-theory-wk9jvg795v.pdf

Government intervention in production and incentives theory : a review of recent contributions

We analyze a model of imperfect price competition between intermediation service providers. We insist on features that are relevant for informational intermediation via the Internet: the presence of indirect network externalities, the possibility of using the nonexclusive services of several intermediaries, and the widespread practice of price discrimination based on users' identity and on usage. Efficient market structures emerge in equilibrium, as well as some specific form of inefficient structures. Intermediaries have incentives to propose non-exclusive services, as this moderates competition and allows them to exert market power. We analyze in detail the pricing and business strategies followed by intermediation services providers.

Chicken & Egg: Competition Among Intermediation Service Providers

This paper argues that parties regulate competition among like-minded factions so as to enhance reputation building by, and voter trust in, the politicians standing for a given cause. While intra- and interparty competition contributes to keeping politicians on their toes, unbridled competition may encourage politicians to challenge good platforms and to wage competition along socially suboptimal dimensions (for example, by privileging form over content). The paper builds a simple model of intraparty competition and studies whether various hierarchical or democratic party institutions constitute an efe cient form of party governance. The paper shows that intraparty disagreements, when they occur, hurt the party’s position in the general election, but that their possibility enhances party image; and that parties must be able to avoid behind-the-scene allocations of portfolios and spoils in order to be credible. Last, it analyzes the impact of political polarization and interparty competition on the choice of party governance.

Parties as Political Intermediaries

We consider a model where two agents, privately informed about their own characteristics, play a (normal form) game on behalf of two uninformed principals. We analyze the existence of precommitment effects through public announcements of contracts, in a model where agency contracts, designed ex-ante, can always be secretly renegotiated, at the ex-ante and interim stages. We show that the existence of precommitment effects depends both on the strategic complementarity of the agents' actions and on the direct effect of the opponents' actions on each principal's welfare. In our model, the possibility of renegotiation is crucial for the existence of precommitment effects. The results are introduced through an example of Cournot and Bertrand competition between firms, viewed as vertical structures.

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Bernard Caillaud

Papers

Chicken and egg: competition among intermediation service providers

Government intervention in production and incentives theory : a review of recent contributions

Chicken & Egg: Competition Among Intermediation Service Providers

Parties as Political Intermediaries

Competing vertical structures: precommitment and renegotiation