Всего статей в данном разделе : 74
Contracting with Externalities [статья]
Опубликовано на портале: 31-01-2007Ilya R. Segal Quarterly Journal of Economics. 1999. Vol. 114. No. 2. P. 337-388.
The paper studies inefficiencies arising in contracting between one principal and N agents when the utility of each agent depends on all agents' trades with the principal. When the principal commits to a set of publicly observable bilateral contract offers, the arising inefficiency is due entirely to the externalities imposed on non-signers. In contrast, when the principal's offers are privately observed, the distortion is due to the externalities given agents' equilibrium trades. Comparison of the two externalities determines the relative efficiency of the two contracting regimes. In both cases, we show that when N is large, each agent can be treated as non-pivotal, provided that appropriate continuity assumptions are satisfied. We also study the case in which the principal can condition each agent's trade on other agents' messages. We characterize the set of such mechanisms in which each agent's participation is voluntary. When the principal can commit to any such mechanism, she implements the first-best outcome, while threatening each deviator with the harshest possible punishment. However, in the presence of noise that goes to zero slower than N goes to infinity, in the limit we obtain a (generally inefficient) outcome in which each agent feels non-pivotal.
Опубликовано на портале: 18-04-2007Kee H. Chung, Jeong-Kuk Kim Journal of Corporate Finance. 1999. Vol. 5. No. 1. P. 35-54.
Empirical evidence suggests that the voting premium in the Korean securities market is strongly related to the structure of corporate ownership. We find that the premium attached to voting stock is positively and significantly associated with the control value of a block of shares held by minority shareholders. We also find that the premium is negatively related to both the fraction of shares that are voting shares and the market value of equity. Empirical results indicate that private benefits of control in Korea are worth about 10% of the value of equity.
Опубликовано на портале: 30-01-2007Philip John Reny, R. Preston McAfee Econometrica. 1992. Vol. 60. No. 2. P. 395-421.
In models of asymmetric information, possession of private information leads to rents for the possessors. This induces mechanism designers to distort away from efficiency. The authors show that this is an artifact of the presumption that information is independently distributed. Rent extraction in a large class of mechanism design games is analyzed, and a necessary and sufficient condition for arbitrarily small rents to private information is provided. Additionally, the two-person bargaining game is shown to have an efficient solution under first-order stochastic dominance and a hazard rate condition. Similar conditions allow full rent extraction in Milgrom-Weber auctions.
Опубликовано на портале: 12-07-2005Reinhard Selten, Myrna Wooders Games and Economic Behavior. 2001. Vol. 34. No. 1. P. 138-152.
We introduce a model of a cyclic game. Designed to take advantage of the recurring nature of certain economic and social situations, a cyclic game differs from an extensive form game in that a cyclic game does not necessarily have an end. The same situations, although with different players, may be repeated infinitely often. We provide an example showing that, even though a cyclic game has, in a sense, perfect information, it may not have an equilibrium in pure strategies. We demonstrate existence of equilibrium and illustrate the application of our model to an oligopolistic industry.
Опубликовано на портале: 29-10-2007Avner Greif Stanford University - Department of Economics: Working Paper. 1997. No. 97-017.
This paper surveys the small, yet growing, literature that employs game theory for economic history analysis. It elaborates on the promise and challenge of integrating game theoretical and economic history analyses and presents the approaches taken in conducting such an integration. Most of the essay, however, is devoted to presenting studies in economic history that utilize game theory as their main analytical framework. Studies are presented based on their substance to highlight the range of potential topics in economic history that can be and had been enriched through a game theoretical analysis.
Опубликовано на портале: 22-01-2007Roger B. Myerson, Mark A. Satterthwaite Journal of Economic Theory. 1981. Vol. 29. No. 2.
We consider bargaining problems between one buyer and one seller for a single object. The seller's valuation and the buyer's valuation for the object are assumed to be independent random variables, and each individual's valuation is unknown to the other. We characterize the set of allocation mechanisms that are Bayesian incentive compatible and individually rational, and show the general impossibility of ex post efficient mechanisms without outside subsidies. For a wide class of problems we show how to compute mechanisms that maximize expected total gains from trade, and mechanisms that can maximize a broker's expected profit.
Опубликовано на портале: 24-01-2007Robert J. Aumann, Adam Brandenburger Econometrica. 1995. Vol. 63. No. 5. P. 1161-1180.
Sufficient conditions for Nash equilibrium in an n-person game are given in terms of what the players know and believe - about the game, and about each other's rationality, actions, knowledge, and beliefs. Mixed strategies are treated not as conscious randomizations, but as conjectures, on the part of other players, as to what a player will do. Common knowledge plays a smaller role in characterizing Nash equilibrium than had been supposed. When n=2, mutual knowledge of the payoff functions, of rationality, and of the conjectures implies that the conjectures form a Nash equilibrium. When n (greater than or equal to) 3 and there is a common prior, mutual knowledge of the payoff functions and of rationality, and common knowledge of the conjectures, imply that the conjectures form a Nash equilibrium. Examples show the results to be tight.
Опубликовано на портале: 23-11-2004Peter J. Davis
This paper presents a theoretical framework that allows estimation of game theoretic models of quantity competition, including a non-trivial class of differentiated product quantity games. The simplest and yet arguably most important examples of a quantity games are entry games. In entry games the choice firms make is discrete (enter/don’t enter) and as a result I study a su ﬃciently general class of models to allow for either continous or integer quantity choices. The main theoretical results of the paper establish easily verifiable conditions under which an index of market output is uniquely determined within the set of Nash equilibria. The model’s parameters may then be estimated by comparing the predicted index of market output in a cross section of markets. The paper provides both a generalization and an extension of the theoretical results developed by Bresnahan and Reiss (1991) and Berry (1992) which allowed estimation of the homogeneous products entry game. I illustrate one member of the class of models that these results allow us to estimate by developing a model of discrete quantity competition using count data from the supermarket industry.
Опубликовано на портале: 30-01-2007George J. Mailath, Larry Samuelson, Jeroen M. Swinkels Econometrica. 1993. Vol. 61. No. 2. P. 273-302.
Different extensive form games with the same reduced normal form can have different information sets and subgames. This generates a tension between a belief in the strategic relevance of information sets and subgames and a belief in the sufficiency of the reduced normal form. We identify a property of extensive form information sets and subgames which we term strategic independence. Strategic independence is captured by the reduced normal form, and can be used to define normal form information sets and subgames. We prove a close relationship between these normal form structures and their extensive form namesakes. Using these structures, we are able to motivate and implement solution concepts corresponding to subgame perfection, sequential equilibrium, and forward induction entirely in the reduced normal form, and show close relations between their implications in the normal and extensive form.
Factor Saving Innovation [статья]
Опубликовано на портале: 14-02-2005Michele Boldrin, David Knudsen Levine Journal of Economic Theory. 2002. Vol. 105. No. 1. P. 18-41.
It has been argued that concave models exhibit less "endogeneity of growth" than models with increasing returns to scale. Here we study a simple model of factor saving technological improvement in a concave framework. Capital can be used either to reproduce itself, or, at some additional cost, to produce a higher quality of capital, which requires less labor input. If better quality capital can be produced quickly, we get a model of exogenous balanced growth as a special case of ours. If, however, better quality capital can be produced slowly, we get a model of "endogenous growth" in which the growth rate of the economy and the rate of adoption of new technologies is determined by preferences, technology and initial conditions. Moreover, in the latter case, the process of growth is necessarily uneven, exhibiting a natural cycle with alternating periods of high and slow growth. Growth paths and technological innovations also exhibit dependence upon initial conditions. The model provides a step toward a theory of endogenous innovation under conditions of perfect competition.
Опубликовано на портале: 07-07-2005Reinhard Selten European Economic Review. 1998. Vol. 42. No. 3-5. P. 413-436.
On the basis of experimental evidence reported in the literature the paper draws conclusions about the bounded rationality exhibited by human economic behaviour. Among the topics discussed are presentation effects caused by superficial analysis, strategic reasoning and strategy construction based on reciprocity and fairness, avoidance of circular concepts in step by step strategic reasoning, ex-post rationality and learning direction theory, presence of both adaptive and analytic approaches to repeated decision tasks, and the absence of quantitative expectations and optimization in typical repeated game strategies
Опубликовано на портале: 30-01-2007Drew Fudenberg, Eric S. Maskin Econometrica. 1986. Vol. 54. No. 3. P. 533-554.
When either there are only two players or a "full dimensionality" condition holds, any individually rational payoff vector of a one-shot game of complete information can arise in a perfect equilibrium of the infinitely-repeated game if players are sufficiently patient. In contrast to earlier work, mixed strategies are allowed in determining the individually rational payoffs (even when only realized actions are observable). Any individually rational payoffs of a one-shot game can be approximated by sequential equilibrium payoffs of a long but finite game of incomplete information, where players' payoffs are almost certainly as in the one-shot game.
Games Played Through Agents [статья]
Опубликовано на портале: 30-01-2007Aldo Rustichini, Andrea Prat Econometrica. 2003. Vol. 71. No. 4. P. 989-1026.
We introduce a game of complete information with multiple principals and multiple common agents. Each agent makes a decision that can affect the payoffs of all principals. Each principal offers monetary transfers to each agent conditional on the action taken by the agent. We characterize pure-strategy equilibria and we provide conditions-in terms of game balancedness-for the existence of an equilibrium with an efficient outcome. Games played through agents display a type of strategic inefficiency that is absent when either there is a unique principal or there is a unique agent.
Опубликовано на портале: 30-01-2007Eric van Damme, Hans Carlsson Econometrica. 1993. Vol. 61. No. 5. P. 989-1018.
A global game is an incomplete information game where the actual payoff structure is determined by a random draw from a given class of games and where each player makes a noisy observation of the selected game. For 2 x 2 games, it is shown that, when the noise vanishes, iterated elimination of dominated strategies in the global game forces the players to conform to J. C. Harsanyi and R. Selten's risk dominance criterion.
Опубликовано на портале: 07-07-2005Reinhard Selten, Klaus Abbink, Joachim Buchta, Abdolkarim Sadrieh Games and Economic Behavior. 2003. Vol. 45. No. 1. P. 19-37.
Using the strategy method (Selten 1967) we elicit subjects' strategies for playing any 2-person 3x3-game with integer payoffs between 0 and 99. In each of 5 tournaments, every strategy pair plays 500000 games. The frequency of pure strategy equilibrium play increases from 51% in the first to 74% in the last tournament, with the equilibria that maximize joint payoff being preferred when multiple exist. For games without pure equilibria, strategies are typically based on elements of the best-reply cascade: MAP (maximize the expected payoff against uniformly randomizing opponents), BR-MAP (best reply to MAP), and BR-BR-MAP (best reply to BR-MAP).