An algorithm for envy-free allocations in an economy with indivisible objects and money

This paper studies envy-free allocations for economies with indivisible objects, quasi-linear utility functions, and an amount of money. We give a polynomially bounded algorithm for finding envy-free allocations. Connectedness of envy-graphs, which are used in the algorithm, characterizes the extreme points of the polytopes of sidepayments corresponding with envy-free allocations. Received: 22 October 1997/Accepted: 19 January 1999     

Existence and Nash implementation of efficient sharing rules for a commonly owned technology

Suppose that a group of individuals owns collectively a technology which produces a consumption good by means of a (possibly heterogeneous) input. A sharing rule associates input contributions with a vector of consumptions that are technologically feasible. We show that the set of allocations obtained by any continuous sharing rule contains Pareto efficient allocations. We also present a mechanism that implements in Nash equilibrium the Pareto efficient allocations contained in an arbitrary sharing rule. Received: 29 June 1998/Accepted: 15 November 2000     

Double implementation of Lindahl allocations by a pure mechanism

This paper considers the issue of designing mechanisms whose Nash allocations and strong Nash allocations coincide with Lindahl allocations for public goods economies when coalition patterns, preferences, and endowments are unknown to the designer. It will be noted that the mechanism presented here is feasible and continuous, and the implementation result is obtained without defining an artificial preference profile on prices announced by individuals. In addition, unlike most existing Nash-implementing mechanisms which need to distinguish the case of two agents from that of three or more agents, this paper provides a unified mechanism which is irrespective of the number of agents. Received: 19 August 1997/Accepted: 16 November 1998     

Money-egalitarian-equivalent and gain-maximin allocations of indivisible items with monetary compensation

Suppose that a certain quantity M of money and a finite number of indivisible items are to be distributed among n people, all of whom have equal claims on the whole. Different allocations are presented using various criteria of fairness in the special case where each player's utility function is additively separable. An allocation is “money-egalitarian-equivalent” (MEE) if each player's monetary valuation of his or her bundle is a fixed constant. We show that there is an essentially unique allocation that is MEE and Pareto-optimal; it is also envy-free. Alternatively, the “gain” of a player may be defined as the difference between how the player evaluates his bundle and an exact nth part of the whole according to his numerical evaluation of the whole. A “gain-maximin” criterion would maximize the minimum gain obtained by any player. We show that Knaster's procedure finds an allocation which is optimal under the gain-maximin criterion. That allocation is not necessarily envy-free, so we also find the envy-free allocation that is optimal under the gain-maximin criterion among all envy-free allocations. It turns out that, even though there exist allocations that are simultaneously envy-free and Pareto-optimal, this optimal allocation may fail to be Pareto-optimal, and it may also violate monotonicity criteria. Received: 30 September 1996/Accepted: 6 March 2002 The author would like to thank Professor William Thomson for a discussion on this subject; and he would like to thank the anonymous referees, who made many substantive suggestions for improving this paper – shortening it, streamlining the arguments, improving the terminology, making further ties with the literature, and improving the exposition.     

The effect of working from home on major time allocations with a focus on food-related activities

Review of Economics of the Household - Telecommuting has been on the rise in the U.S. and working from home may affect how workers allocate their time over the course of a day. In this paper, using...     

Existence of a multicameral core

When a single group uses majority rule to select a set of policies from an n-dimensional compact and convex set, a core generally exists if and only if n = 1. Finding analogous conditions for core existence when an n-dimensional action requires agreement from m groups has been an open problem. This paper provides a solution to this problem by establishing sufficient conditions for core existence and characterizing the location and dimensionality of the core for settings in which voters have Euclidean preferences. The conditions establish that a core may exist in any number of dimensions whenever n ≤ m as long as there is sufficient preference homogeneity within groups and heterogeneity between groups. With m > 1 the core is however generically empty for . These results provide a generalization of the median voter theorem and of non-existence results for contexts of concern to students of multiparty negotiation, comparative politics and international relations.     

Environmental certification of forests: The evolution of environmental governance in a commodity network

Non-governmental organizations (NGOs) influence social and environmental aspects of commodity production through certification schemes like organic and forest certification. As these become mainstream, however, they are often compromised by the interests of more powerful agents. Utilizing the concept of governance in global commodity networks, this article examines the mainstreaming of forest certification. By working with retailers, forest certification expanded rapidly. The retailer focus, however, limits the spread of forest certification among medium-sized, small, and community forest management operations. It also raises questions of fairness because it imposes costs on forest managers without providing compensation through higher prices. NGOs now implement programs to make Forest Stewardship Council (FSC) certification more accessible and more useful to forest managers, but these do not resolve the imbalance of power between the big retailers demanding certification and the small forest managers who must absorb increased costs. The dominance of big retailers in commodity networks provides an attractive route to rapidly mainstream certification schemes, but it also limits their reach and compromises their equity.     

Groves sealed bid auctions of heterogeneous objects with fair prices

We study the allocation of heterogeneous indivisible objects to agents whose valuations of the objects depend on what other objects they are obtained with. We apply the envyfree criterion to Groves sealed bid auctions, which are value maximizing and dominant strategy incentive compatible for this multi-object allocation problem. First we show that if valuations are unrestricted then there is no Groves auction which ensures that the allocation is always envyfree. We obtain a positive result, however, if the valuations of the objects are superadditive, and give a complete characterization of Groves prices that guarantee envyfreeness for superadditive valuations. Received: 25 April 2001/Accepted: 3 April 2002 I would like to thank Kim Border, Tom Palfrey, and especially John Ledyard for their comments. Special thanks are due to Katya Sherstyuk. Support from a Sloan Dissertation Fellowship is gratefully acknowledged.     

学生文化的存在及其与成人文化的冲突

要认识学生文化价值的独立性,正视学生文化特有的价值和意义,为学生文化的充分发展和发育提供应有的空间.加快教育体制改革是解决学生文化与成人文化冲突的基础性工程.     

Existence of homogeneous representations of interval orders on a cone in a topological vector space

Necessary and sufficient conditions are presented for the existence of a pair <u,v> of positively homogeneous of degree one real functions representing an interval order on a real cone K in a topological vector space E (in the sense that, for every x,yK, xy if and only if u(x)v(y)), with u lower semicontinuous, v upper semicontinuous, and u and v utility functions for two complete preorders intimately connected with . We conclude presenting a new approach to get such kind of representations, based on the concept of a biorder.This research has been supported by the Integrated Action of Research HI2000-0116 (Spain-Italy). Also, the work of coauthors Candeal and Induráin has been partially supported by the research project PB98-551 Estructuras ordenadas y aplicaciones (M.E.C. Spain, December 1999).     

Labour is not a commodity: The content and meaning of work in the twenty‐first century

In his valedictory lecture before the Collège de France, Alain Supiot reviews his work on the transformation of labour in the twenty‐first century, highlighting the role of law and institutions in addressing the consequences of the digital revolution and environmental crisis. In his view, the moral, social and environmental bankruptcy of neoliberalism calls for us to reconsider the legal fiction of labour as a commodity and to re‐establish the truly “humane labour regime” envisaged by the preamble to the ILO Constitution, recognizing both the meaning and content of work. He uses the case of scientific research to illustrate his argument.     

Existence of a coalitionally strategyproof social choice function: A constructive proof

This paper gives a concrete example of a nondictatorial, coalitionally strategyproof social choice function for countably infinite societies. The function is defined for those profiles such that for each alternative, the coalition that prefers it the most is “describable.” The “describable” coalitions are assumed to form a countable Boolean algebra. The paper discusses oligarchical characteristics of the function, employing a specific interpretation of an infinite society. The discussion clarifies within a single framework a connection between the negative result (the Gibbard-Satterthwaite theorem) for finite societies and the positive result for infinite ones. Received: 10 August 1998/Accepted: 29 February 2000     

Communication, equity and the voluntary provision of a public good by heterogeneous groups

Twenty-four laboratory sessions were conducted to evaluate the roles of communication and group heterogeneity when voluntary contributions determine the level of public good provision by small groups of individuals. Simple heterogeneity has one individual in a group having either greater endowment of resources or a greater preference for the public good than the others. Complex heterogeneity has one individual in a group having both higher endowment and greater preference for the public good. Without communication, members of heterogeneous groups tend to coordinate more on equal contribution shares than predicted by the conventional public goods model but consistent with a model incorporating a preference for equity. The distribution of relative contributions and total payoffs within groups exhibit strong interactions between communication and heterogeneity, leading to less equitable distributions of payoffs as heterogeneity becomes more complex. A model of equity theory helps to organize the results. Results suggest that communication may refocus the objective of group members.     

Locus of control and other-regarding behavior: Experimental evidence from a large heterogeneous sample

This paper investigates the relationship between locus of control and other-regarding behavior in a large and heterogeneous sample of the French population. We relate locus of control with incentivized measures of other-regarding behavior in the dictator and ultimatum games. Participants with high internal locus of control offer comparatively less in situations with passive responders (dictator game) but tend to increase their offers when their counterparts have veto power (ultimatum game). Moreover, they appear better at anticipating responders’ behavior in the ultimatum game, which leads to offers with a higher probability of acceptance and higher expected payoff. Some results for the ultimatum game, however, are sensitive to model specification and sample composition. Our findings suggest that a high internal locus of control increases individuals’ ability to adapt to strategic and non-strategic settings.     

A qualitative exploratory study of substance abuse prevention outcomes in a heterogeneous prevention system

The prevention of abuse of alcohol and other drugs is a concern for parents, policy-makers, educators, and social service professionals. Prevention programs are sponsored by many different types of social and educational agencies using a variety of intervention strategies. This article reports a study of a sample of such programs in the state of Nevada. The overall prevention system in the state espouses a "risk and resiliency" approach to prevention. Focus group methodology was used to study perception of outcomes of these programs from the viewpoints of various program stakeholders (youth participating in the programs, parents of participants and program staff). Analysis of the qualitative data yielded findings about potential outcomes as well as implicit program theories. Implications for future planning efforts as well as further evaluation efforts are discussed.     

The possibility of efficient provision of a public good in voluntary participation games

In this study, we provide the conditions for efficient provision of a public good in a participation game in which a non-negative integer number of units of the public good can be provided. In the case in which at most one unit of the public good can be provided, we provide refinements of Nash equilibria at which agents choose only a Nash equilibrium with an efficient allocation and provide sufficient conditions for cost-sharing rules that guarantee the existence of a Nash equilibrium with an efficient allocation. In the case of a multi-unit public good, we provide a necessary and sufficient condition for the existence of a Nash equilibrium with an efficient allocation and prove that Nash equilibria are less likely to support efficient allocations if the participation of many agents is needed for efficient provision of the public good in the case of identical agents. I would like to thank Koichi Tadenuma, Yukihiro Nishimura, Toshiyuki Fujita, John Weymark, Tatsuyoshi Saijo, Takehiko Yamato, Toshiji Miyakawa, Motohiro Sato, Takashi Shimizu, Nobue Suzuki, and Dirk T. G. Rübbelke for helpful comments and suggestions. I also thank the anonymous referees for detailed comments and suggestions. This research was supported by the Japanese Economic Research Foundation and the Grand-in-Aid for Young Scientists (Start-up) from the Japan Society for the Promotion of Science. Any remaining errors are my own.     

Postcoital Contraception: Awareness of the Existence of Postcoital Contraception among Students who have had a Therapeutic Abortion

Abstract

A two-semester survey was conducted to obtain information about the underutilization of postcoital contraception (PCC) in terms of fear about using it or ignorance of its existence. Among 437 students attending the women's health clinic at California State University/Fresno, 41% had had a therapeutic abortion. One hundred fifty-two, or 84.9%, of those who had had terminations were not aware of PCC. Some were not aware that they had taken a chance of becoming pregnant. It is concluded that students who have had a therapeutic abortion either were unaware of the existence of PCC or were unaware they were risking pregnancy and therefore unable to utilize PCC to avoid the need for a surgical procedure. It would appear that ignorance about the existence of PCC is a major reason for its underutilization.

“Treatment of First Episodes of Genital Herpes Simples Virus Infection with Oral Acyclovir,” YVONNE J. BRYSON, MARYANNE DILLON, MICHAEL LOVETT, GUILLERMO ACUNA, STEPHEN TAYLOR, JAMES D. CHERRY, B. LAMAR JOHNSON, EDWARD WIESMEIER, WILLIAM GROWDON, TERRI CREAGH-KIRK, RONALD KENNEY. We performed a double-blind placebo-controlled trial of oral acyclovir in the treatment of first episodes of genital herpes simplex virus infections in 48 young adults (31 women and 17 men). Subjects were randomized to receive either placebo or acyclovir (200 mg per dose) five times daily for 10 days; they were examined on at least eight visits until healed and at monthly visits thereafter. Acyclovir treatment, as compared with placebo, significantly reduced virus shedding, new lesion formation after 48 hours, and the duration of genital lesions in both men and women. The total duration and severity of clinical symptoms (such as pain, adenopathy, dysuria, and malaise) were significantly reduced by acyclovir in both men and women by the third and fourth day, respectively (P ≤ 0.025), as compared with placebo. No toxicity was observed. Recurrence rates have so far been similar in placebo and acyclovir recipients. Oral acyclovir treatment of first-episode genital herpes simplex virus infections is clincially effective, but it does not seem to prevent virus latency or associated recurrent disease. (New England Journal of Medicine 1983;308:916–21)

“Cesarean Section: Risk and Benefits for Mother and Fetus,” BEN P. SACHS, BRIAN J. McCARTHY, GEORGE RUBIN, ANTHONY BURTON, JULES TERRY, CARL W. TYLER. We studied the effects of cesarean section on neonatal mortality for breech infants and low-birth weight vertex infants using data from the Georgia neonatal surveillance network on 392,241 singleton deliveries between 1974 and 1978. The risk of neonatal death for breech infants weighing 4,000 g or less delivered vaginally was significantly higher than the risk for those delivered by cesarean section. The lower the birthweight, the higher the risk for a vaginal breech delivery. For breech infants weighing 1,000 to 2,500 g, the risk was almost 2½ times greater for a vaginal delivery v a cesarean delivery. The best outcome for high-risk vertex infants weighing 1,000 to 1,500 g was for those delivered by cesarean section in a tertiary perinatal center. An increase in the cesarean section rate may be associated with increased neonatal survival; however, the benefits must be weighed against the costs of an increased maternal mortality and morbidity. (Journal of the American Medical Association 1983;250:2157–2159)     

The human component of sustainability: a study for assessing "human performances" of energy efficient construction blocks

This paper presents an applied research aimed at understanding the relevance and the applicability of human related criteria in sustainability assessment of construction materials. Under a theoretical perspective, human factors consideration is strongly encouraged by building sustainability assessment methods, but the practice demonstrates that current models for building sustainability assessment neglect ergonomic issues, especially those ones concerning the construction phase. The study starts from the observation that new construction techniques for high energy efficient external walls are characterized by elements generally heavier and bigger than traditional materials. In this case, high sustainability performances connected with energy saving could be reached only consuming high, and then not very much sustainable, human efforts during setting-up operations. The paper illustrates a practical approach for encompassing human factors in sustainability assessment of four block types for energy efficient external walls. Research steps, from block selections to bricklaying task analysis, human factors indicators and metrics formulation, data gathering and final assessment are going to be presented. Finally, open issues and further possible generalizations from the particular case study will be discussed.