Public goods provision: Unit-by-unit cost-sharing rules and the core

In a simple model of one public good producible from one input, we show that unit-by-unit cost-sharing rules have two properties. First, a unit-by-unit cost-sharing rulealways chooses a core allocation. Second, every allocation in the core will be chosen by at least one unit-by-unit cost-shring rule. We argue that costs should be shared on a unit-by-unit basis. We propose a simple mechanism to implement the family of unit-by-unit rules. Received: 18 May 2005, Accepted: 6 December 2005 JEL Classification: H41, C72, D78 I thank Hervé Moulin for helpful comments and discussions. All errors are mine. Financial support from the Hong Kong Research Grants Council under grant RGC-DAG99/00.BM52 is gratefully acknowledged.     

The condominium problem; auctions for substitutes

This paper considers the problem of designing selling procedures for substitutes (like condominium units). Oral, ascending auctions for the right to choose are efficient. This is a common type of auction used for the sale of real estate. Efficiency is not optimal from the seller’s viewpoint. An optimal procedure distorts the right-to-choose auction to favor in late rounds bidders whose preferred object has already been sold. This optimal auction is complex. A revenue improving departure from efficiency can be achieved by simply auctioning all the rights to choose before any of them is exerted.Received: 5 February 2003, Accepted: 15 February 2005, JEL Classification: D44I acknowledge very helpful comments by Joe Harrington, Ken Hendricks, and anonymous referees. Financial aid from the European Commission through the TMR Program (contract FMRX-CT98-0203) and the Spanish MCyT (Grants SEC 2002-02506 and SEC 2003-08080) is also gratefully acknowledged.     

Consulting experts with vested interests: The power of benchmarking

A decisionmaker gets independent advice from two experts, who can be of two different types. Experts are risk-neutral and prefer certain policies irrespective of the state of nature, so to induce information-sharing the decisionmaker must reward truthful experts. I show that, in this environment, a heterogeneous committee has no informational advantage over a single expert: a decision rule that encourages one expert to be honest immediately makes honesty less attractive for the other. With a homogenous committee, the higher is the correlation between the experts’ signals, the more the decisionmaker is willing to pay to secure independent advice.Received: April 2004, Accepted: Accepted: January 2005, JEL Classification: D71, D82Lars Frisell: I thank David Austen-Smith, Tim Feddersen, Johan Lagerlöf, Jan Potters, Ken Shotts, Jonas Vlachos, Jörgen W. Weibull, an anonymous referee, and especially Karl Wärneryd for helpful comments. Financial support from the Jan Wallander and Tom Hedelius Foundation and the Sweden-America Foundation is gratefully acknowledged.     

基本养老保险基金：做实账户制还是名义账户制？

我国城镇企业职工基本养老保险个人账户在本质上体现的是养老权而不是财产权,基本养老保险个人财户权益的根本意义在于保障企业职工的社会养老权。我国从2001年开始实行做实企业职工基本养老保险个人账户试点,这不仅未能化解养老金支付风险,而且加大了养老保险基金保值增值难度,基金贬值程度也随着做实比例的提高而增大。另外,做实个人账户抬高了储蓄率并抑制了投资和消费需求,对经济发展产生了挤出效应。为解决上述问题,应建立更加公平可持续的养老金制度,通过名义账户制从根本上体现企业职工的财产权和社会养老权,解决做实账户制所出现     

Spatial social networks

We introduce a spatial cost topology in the network formation model analyzed by Jackson and Wolinsky, Journal of Economic Theory (1996), 71: 44–74. This cost topology might represent geographical, social, or individual differences. It describes variable costs of establishing social network connections. Participants form links based on a cost-benefit analysis. We examine the pairwise stable networks within this spatial environment. Incentives vary enough to show a rich pattern of emerging behavior. We also investigate the subgame perfect implementation of pairwise stable and efficient networks. We construct a multistage extensive form game that describes the formation of links in our spatial environment. Finally, we identify the conditions under which the subgame perfect Nash equilibria of these network formation games are stable. We are very grateful for the constructive comments of Matt Jackson and an anonymous referee. We also like to thank Vince Crawford, Marco Slikker, Edward Droste, Hans Haller, Dimitrios Diamantaras, and Sudipta Sarangi for comments on previous drafts of this paper.We acknowledge Jay Hogan for his programming support. Part of this research was done while visiting the CentER for Economic Research, Tilburg University, Tilburg, The Netherlands.Financial support from the Netherlands Organization for Scientific Resrarch (NWO), grant B46-390, is gratefully acknowledged.-->,     

Optimal design of trade institutions

We model an economy with social institutions that facilitate trade and induce three types of costs: establishment costs, access costs, and use costs. Use costs are specific transaction costs related to the use of these trade institutions. We assume that a trade institution is economically completely determined by the costs it imposes and by the effects on the trades it facilitates. We extend the Pareto efficiency concept to include various modes of organization of social institutions: the costs and benefits of these organizations are expressed in the trades they facilitate.Within this setting we discuss a valuation equilibrium concept, in which all agents use a common conjectural price system that assigns to every trade institution the price vector that would prevail under it. This feature of the equilibrium is important in securing the second welfare theorem, and is new to the analysis of economies with costly trade. Since the use costs can be nonlinear, there are non-convexities that prevent the second welfare theorem from obtaining in a finite economy, but we show it for large economies.Received: 3 April 2002, Accepted: 30 April 2003, JEL Classification: D59, D70, H49Robert P. Gilles: donewhile visiting the Center for Economic Research, Tilburg University, Tilburg, The Netherlands. Financial support from the Netherlands Organization for Scientific Research (NWO), grant B46-390, is gratefully acknowledged.Dimitrios Diamantaras: Part of this research wasSupport from Temple University via a Fuller research fellowship is gratefully acknowledged.The authors would like to thank Suzanne Scotchmer, Andreu Mas-Colell, Marcus Berliant, Shlomo Weber, Hans Haller, Dhanajay Gokhale, Julian Manning, and two anonymous referees for their valuable comments and discussions of previous drafts of this paper. A previous version of this paper was circulated as Equilibria of economies with costly trade.     

Efficiency and information aggregation in auctions with costly information

Consider an auction in which k identical objects are sold to n > k bidders who each have a value for one object which can have both private and common components to it. Private information concerning the common component of the object is not exogenously given, but rather endogenous and bidders face a cost to becoming informed. If the cost of information is not prohibitively high, then the equilibrium price in a uniform price auction will not aggregate private information, in contrast to the costless information case. Moreover, for a wide class of auctions if the cost of information is not prohibitively high then the objects can only be allocated in a weakly efficient sense, and then only if the equilibrium proportion of endogenously informed agents is vanishing as the economy grows. In spite of these results, it is shown that there is a mechanism for which there exist equilibria and for which (weak) efficiency is achieved as the economy grows in the face of endogenous information acquisition.Received: 6 August 2001, Accepted: 27 July 2002, JEL Classification: C72, D44, D82Financial support under NSF grant SBR-9507912 is gratefully acknowledged. I thank Valentina Bali for conversations out of which this project grew, and Larry Ausubel for a very helpful discussion of an early version of this paper at the 1998 summer meetings of the Econometric Society from which I have borrowed in structuring the exposition of the paper. I also thank Andy Postlewaite, Jeroen Swinkels, and an associate editor and anonymous referee for helpful comments and suggestions on earlier drafts.     

Arbitrage in stationary markets

We analyse questions of arbitrage in financial markets in which asset prices change in time as stationary stochastic processes. The main focus of the paper is on a model where the price vectors are independent and identically distributed. In the framework of this model, we find conditions that are necessary and sufficient for the absence of arbitrage opportunities. We discuss the relations between the results obtained and the phenomenon of “volatility-induced growth” in stationary markets. Financial support by the Swiss National Center of Competence in Research “Financial Valuation and Risk Management” (NCCR FINRISK) is gratefully acknowledged.     

Tax implementability of fair allocations

This paper examines the tax implementability of allocations based on fairness as no-envy (or envy-freeness) and its alternatives, by a tax schedule that depends on labor supply and gross income ((y,l)-implementability). A relevant incentive constraint is perishability of abilities, where agents can exert a lower ability level than they actually possess. We first show that in any economy, every envy-free allocation is (y,l)-implementable. On the other hand, whereas we already know that no-envy may be incompatible with first-best Pareto efficiency, the alternative equity concepts which circumvent this first-best equity-efficiency trade-off meet the obstacle of tax implementability even when labor supply is observable. We also clarify necessary and sufficient domain restrictions under which the egalitarian equivalent allocations satisfy the (y,l)-implementability condition.Received: 15 November 2002, Accepted: 7 July 2004, JEL Classification: D63, D78, H21Yukihiro Nishimura: A preliminary version of this paper was presented at the 35th Annual Meeting of the Canadian Economics Association (McGill University, Montreal, Quebec, Canada) and the Sixth International Conference of Society of Social Choice and Welfare (California Institute of Technology, Pasadena, USA). The author acknowledges Koichi Tadenuma, Francois Maniquet, Shinji Yamashige, Kotaro Suzumura, Paul Makdissi, Robin Boadway, Georg Tillmann, Stefan Dodds, the Associate Editor and anonymous referees for helpful comments. The usual disclaimer follows. Financial support from the Department of Economics and the School of Graduate Studies of Queens University, the Yokohama Academic Foundation and the Grant-in-Aid for Young Scientists (B) from the Ministery of Education, Culture, Sports, Science and Technology is gratefully acknowledged.     

Influence costs and hierarchy

In an internal capital market, individual departments may compete for a share of the firm’s budget by engaging in wasteful influence activities. We show that firms with more levels of hierarchy may experience lower influence costs than less hierarchical firms, even though the former provide more opportunities for exerting influence. The unique influence-cost minimizing hierarchy is strongly asymmetric. With a linear production technology this is also the optimal hierarchy. If individual departments have different productivities, however, and the production technology exhibits decreasing returns to scale, a symmetric hierarchy that does not minimize influence costs may be optimal.Received: July 2004, Accepted: October 2004, JEL Classification: D74, G31, G34We thank Martin Hellwig, seminar participants at the University of Mannheim, and an anonymous referee for helpful comments, and Kai Konrad for handling the editorial tasks on this paper. Financial support from Deutsche Forschungsgemeinschaft, Sonderforschungsbereich 504 (Inderst and Müller) and the Bank of Sweden Tercentenary Foundation (Wärneryd) is gratefully acknowledged.     

Reviewing Oates' insights in a repeated game setting

This paper analyzes the optimal assignment of public good policies to layers of a federal system in a repeated game setting. Under a centralized regime, public goods are financed jointly across regions, and a federal legislature decides on the regional quantities. Under a decentralized regime, public goods are financed locally, and governments play a non-cooperative provision game. We find that a centralized (decentralized) regime is more likely to provide the efficient public good policies in case spillovers are small (large). Received: September 2003, Accepted: October 2004 JEL Classification: H11, H41 I wish to thank Clemens Fuest, Anke Kessler, Christoph Lülfesmann, and an anonymous referee for valuable comments on this paper. Financial support by the DFG (SPP 1142) is gratefully acknowledged.     

Optimal speculative trade among large traders

A collection of large traders holds heterogeneous prior beliefs regarding market fundamentals. This gives them a motive to engage in speculative trade with respect to market prices. Rather than assuming a particular institution or market for speculative trade, we take a mechanism-design approach by attempting to characterize the mechanism that maximizes the traders’ gains from speculative trade, subject to the incentive constraints that result from the traders’ ability to manipulate market prices. Within a stylized market model, we show that this mechanism affects price volatility without destroying ex-post efficient allocations. We also characterize the implementability of optimal speculative trade when the traders’ prior beliefs are private information. Financial support from the US-Israel Binational Science Foundation, Grant No. 2002298 is gratefully acknowledged.     

Stable and efficient bargaining networks

Abstract. We examine a bargaining game among players connected by a network, where successively potential partners negotiate over terms of a project. For any network structure and ordering of selection of bargaining partners, there is a unique subgame perfect equilibrium outcome which coincides with the standard Rubinstein split. Based on this, we derive expected payoffs for players as a function of the network. We the characterize the pairwise stable and efficient bargaining networks. These two sets do not always coincide and in many situations pairwise stable networks are over-connected. Received: 10 April 2001 / Accepted: 17 January 2002 I am indebted to Matthew Jackson for suggesting this paper. I also thank Bernard Caillaud, Sanjeev Goyal, and the seminar participants at Universidad de Alicante, Universidad Carlos III de Madrid, CEMFI (Madrid), Universitat Autònoma de Barcelona, Erasmus University of Rotterdam, Universitat Pompeu Fabra (Barcelona) and CERAS (Paris) for helpful comments. This paper was written while at Universitat Pompeu Fabra and CERAS. Financial support from the Spanish Ministry of Education through research grant DGESIC PB96-0302, and from the Ecole Nationale des Ponts et Chaussées, Paris is gratefully acknowledged. All errors are of course mine.     

Market portfolio efficiency and value stocks

In this journal, Best, Best, and Yoder (2000) recently demonstrated that portfolios of U.S. value stocks dominate portfolios of U.S. growth stocks in terms of second-order stochastic dominance (SSD). We cannot conclude from this finding that the market is SSD inefficient, however, because market portfolio efficiency generally does not require growth portfolios to be efficient. Furthermore, stochastic dominance results are very sensitive to sampling error. In fact, the value-weighted market portfolio is not significantly inefficient, and no significant value effects exist in the sample of Best, Best, and Yoder. This study forms part of a research program on stochastic dominance. Details on the program are available at http://www.few.eur.nl/few/people/gtpost/stochastic_dominance.htm. We appreciate the comments of an anonymous referee. The financial support of Tinbergen Institute, Erasmus Research Institute of Management, and Erasmus Center of Financial Research is gratefully acknowledged. Any remaining errors are the authors' responsibility.     

Efficiency and truthfulness with Leontief preferences. A note on two-agent,two-good economies

In exchange economies where agents have private information about their preferences, strategy-proof and individually rational social choice functions are in general not efficient. We provide a restricted domain, namely the set of preferences representable by Leontief utility functions, where there exist mechanisms which are strategy-proof, efficient and individually rational. In two-agent, two-good economies we are able to provide an even stronger result. We characterize the class of efficient and individually rational social choice functions, which are fully implementable in truthful strategies.Received: 28 April 2003, Accepted: 23 June 2003, JEL Classification: D51, D71The author thanks Matthew Jackson, Jordi Massó and James Schummer for fruitful discussions, William Thomson for many valuable comments on an earlier version. A particular thank to Salvador Barberá for his fundamental help.     

Transfer and adaptation of technology: The dairy industry in Sweden and Uruguay

This article studies the adaptation of technology in the dairy industry when it is transferred from its country of origin (Sweden) to a Third World country (Uruguay). Both average and frontier production functions are used to study the spread in technology. We find that although trends in technology appear to be the major determinant of factor choice in Uruguay, there is still some adaptation to local factor prices and other local conditions.Thanks are due to Finn Försund, Lennart Hjalmarsson, Mario Zejan and two anonymous referees. Financial support from SAREC, Sweden, is gratefully acknowledged.     

Strategic delegation in oligopolistic tournaments

This paper considers a two-stage game with two owners and two managers. At the first stage, the owners choose a linear combination of profits and sales as incentives for their managers. At the second stage, the two managers compete in an oligopolistic tournament against each other. The findings substantially differ from the results for Cournot or Bertrand oligopoly: There exist asymmetric equilibria where one owner puts a positive weight on sales and the other a negative one, although the structure of the game is completely symmetric. If the influence of noise vanishes, the owner of the more aggressive firm will even induce sales maximization to his manager in order to preempt his competitor. Received: 22 April 2004, Accepted: 25 December 2005 JEL Classification: L1, M2 I would like to thank the editor Semih Koray, two anonymous referees, Ulf Schiller, Dirk Sliwka, Gunter Steiner, and the participants of the Microeconomics Seminar of the Humboldt University at Berlin for very helpful comments. Financial support by the Deutsche Forschungsgemeinschaft (DFG), grant KR 2077/2-3 and SFB/TR 15 ("Governance and the Efficiency of Economic Systems"), is gratefully acknowledged.     

Exchange-proofness or divorce-proofness? Stability in one-sided matching markets

Two stability concepts for one-sided matching markets are analyzed: Gale-Shapley stability and ξ-stability. The first one applies best to markets where no status quo allocation is considered, whereas the second one is a solution to be used when property rights are allowed. A common problem of existence is shared by both solution concepts. Hence, we study economic environments where this problem does not exist, and present a family of agents’ preferences for which existence is guaranteed for both Gale-Shapley stable and ξ-stable outcomes. This work was finished while the author was visiting Duke University, whose hospitality is gratefully acknowledged. Swveral discussions with Salvador Barberà, Hervé Moulin and Marilda Sotomayor and some advice by an anonymous referee were specially useful. This work is partially supported by Grants PB 92-0590 and PB 93-0938 from the DGICYT, the Spanish Ministery of Educación Ciencia, and the Institut Valencià d’Investigacions Econòmiques.     

Manipulation of the Walrasian mechanism in production economies with unbounded short-selling

Hurwicz (1979) and Otani and Sicilian (1982, 1990) characterized the Nash equilibrium allocations of the Walrasian demand manipulation game in successively more general exchange environments. In this paper, I extend the analysis to production economies with short-selling. First, I generalize Hurwicz’s and Otani and Sicilian’s theorem that any allocation at which each agent’s consumption bundle lies above her true offer curve can be supported in Nash equilibrium. I then show that for finite economies of any size the set of such allocations is often topologically large.Received: 17 January 2003, Accepted: 4 April 2005, JEL Classification: D51, D82For comments on this and earlier versions of the paper, I wish to thank Rick Bond, Bhaskar Chakravorti, Tom Gresik, Costas Syropoulos and William Thomson. I would especially like to thank Mike Jerison for helping to overcome a difficulty with a previous version. Also, the comments of the anonymous referees are gratefully acknowledged.     

Preemptive behavior in sequential-move tournaments with heterogeneous agents

Rank-order tournaments are usually modeled simultaneously. However, real tournaments are often sequential. We show that agents' strategic behavior in sequential-move tournaments significantly differ from the one in simultaneous-move tournaments: In a sequential-move tournament with heterogeneous agents, the first acting agent may choose a preemptively high effort so that the following agent gives up. The principal is able to prevent preemptive behavior in equilibrium by choosing a sufficiently small spread between winner and loser prize. Received: January 2003, Accepted: November 2004 JEL Classification: J3, M12, M5 We would like to thank two anonymous referees and the editor Kai Konrad for helpful comments. Financial support by the Deutsche Forschungsgemeinschaft (DFG), projects no. KR 2077/2-1 and SFB/TR 15 ("Governance and the Efficiency of Economic Systems"), is gratefully acknowledged.