Generic efficiency and collusion-proofness in exchange economies

The purpose of this paper is to study the kind of efficient allocations that can be achieved in exchange economies with asymmetric information, by means of a decentralized mechanism robust to coalitional, strategic deviations. To this end, we define a new strategic equilibrium concept – called strong collusion-proof contract – designed to characterize stable communication agreements in games with differential information against non-binding, self-enforcing and incentive compatible deviations by coalitions. We then construct a strategic market mechanism which, for quasi-linear economies, is such that its strong collusion-proof contracts generically induce the incentive compatible interim efficient allocations. Moreover, we show that these allocations can be achieved by strong collusion-proof contracts. We show that the internally consistent extension of the strong collusion-proof contracts generically yields the same set of efficient allocations. Received: 22 January 2001/Accepted: 15 April 2002 RID="*" ID="*"  This author was working at CORE when this paper was written. We wish to thank Claude d'Aspremont, David Martimort, Jean-Fran?ois Mertens and Heracles Polemarchakis for helpful comments on an earlier version. The usual disclaimer applies.     

Men's and Women's Interpretation and Endorsement of Items Measuring Self-Reported Heterosexual Aggression

Early research on sexual aggression (e.g., sexual coercion, sexual assault, and rape) mainly focused on men as perpetrators and women as victims; more recently, researchers have begun to investigate women as perpetrators of sexual aggression as well. However, most measures of sexual aggression perpetration were designed for use with men and have not been well validated with women. This study sought to examine two different measures of sexual aggression perpetration in terms of their convergent validity for both men and women and to examine gender differences and similarities in item interpretation using open-ended inquiries. Participants were 590 individuals (395 women, 195 men) with a mean age of 25 years (SD = 8.1) recruited from an undergraduate psychology subject pool and an online convenience sample. The majority of the sample was White (65.4%) and Black (20.3%). All measures were completed online anonymously. Results suggested that convergent validity for the two measures was less than optimal, particularly for women. Further, item interpretation analyses revealed that, compared to men, more than twice the percentage of women provided a false-positive response to one of the measures, suggesting that women may be more likely than men to endorse self-report perpetration items incorrectly.     

Dialogues or polemics: Social science expertise and welfare reform in Quebec

The development of social assistance and poverty reduction policies has been informed by social scientific knowledge. Social scientists, however, are not of one mind on such matters. They tend to be divided along disciplinary and ideological lines and may even foster political divisions and conflicts. This article draws on the author's experience as an academic policy adviser to the Quebec government to analyse from up close the institutional context that facilitates knowledge utilisation in the policy process. Two reform processes are considered: the first one, between 1995 and 1998, was less collaborative and led to divisions, and the second, between 1997 and 2009, involved more interactions with the civil service and proved more fruitful. In both cases, experts were divided, as were politicians and civil servants, but their capacity to reach a consensus was fostered, in the second case, by better support and collaboration from the government.     

Copula-graphic estimation with left-truncated and right-censored data

In Survival Analysis and related fields of research right-censored and left-truncated data often appear. Usually, it is assumed that the right-censoring variable is independent of the lifetime of ultimate interest. However, in particular applications dependent censoring may be present; this is the case, for example, when there exist several competing risks acting on the same individual. In this paper we propose a copula-graphic estimator for such a situation. The estimator is based on a known Archimedean copula function which properly represents the dependence structure between the lifetime and the censoring time. Therefore, the current work extends the copula-graphic estimator in de Uña-Álvarez and Veraverbeke [Generalized copula-graphic estimator. Test. 2013;22:343–360] in the presence of left-truncation. An asymptotic representation of the estimator is derived. The performance of the estimator is investigated in an intensive Monte Carlo simulation study. An application to unemployment duration is included for illustration purposes.     

Review of practices for keeping people with disabilities in employment: moving beyond the concept of compensation to implement a developmental approach

In France, there are strict laws in place to ensure that people with disabilities have access to, and can remain in employment. In this context, many businesses have "group agreements", to support and fund in-house actions in this area. For the last five years, as part of our work as consultant ergonomists, we have carried out over fifty ergonomics interventions for one of our clients to adapt the working environment for persons with disabilities. This paper presents an analysis of our practices to adapt working environment for employees with disabilities by means of a review of these different interventions. This analysis of practices specifically focuses on an issue we consider to be of vital importance: how to get past the concept of an impairment which can be compensated for with technical solutions, a concept in which both French legislation, and the practices of certain professionals working in the field of occupational disability are firmly rooted, and move towards a developmental approach, with the aim of designing an "enabling environment" [2-4,13].     

Ergonomic analysis of the work conditions of porters and owners of the Supply Center of Campinas, SP

Transforming work conditions is part of the ergonomic action that should help to improve work situations that brings risks to the workers health. six workers were observed in different locations of the supply center (Central Free Market, Free Market 2, Flowers Market and Permanent Shed 4). During the observation of workers to the Ergonomic Analysis of Work - AET (Rohmert and Landau) was performed. The workers were divided into two groups: porters and owners. The porters were the most susceptible to the risks of work and minor accidents with sharp wood from boxes or even risk of traffic accidents as pedestrians. However, regarding the use of mental ability for negotiations, use of computers and organizing and planning the establishment of work, the owners were the ones that most time played these activities. The ergonomics advocates work that can be transformed and that favors employee and employer. It is, therefore, intended to redefine the strategies that are embedded into the organizational structure of work.     

Why practitioners do (not) apply crisis communication theory in practice

Twenty-five in-depth interviews with Belgian crisis communication practitioners were conducted to examine the gap between theory and practice. Crisis communication has become an important research area within public relations. Several studies have resulted in theories and guidelines regarding the effective use of communication during organizational crises. Unfortunately, these findings are not always put into practice. This study examines to what extent public relations practitioners apply theory in practice during crises and why. The findings offer an opportunity to formulate potential ways in which we can bridge the scholar-practitioner divide in public relations, through guidelines for both scholars and practitioners.     

The multiplicity of iPod cultures in everyday life: uncovering the performative hybridity of the iconic object

This article looks at the Apple iPod as an iconic and hybrid music object and explores the multiplicity of iPod cultures in everyday life. It reviews the existing literature on the iPod and advances two main paradigms on iPod culture – the individual cognition enabled by the Apple object during private and mobile listening practices or the algorithmic socialization afforded by the use of the Genius recommendation system for example. Tackling these two existing paradigms, I pose the hybridity of the iPod as the basis of its iconicity. Thus, the iPod allows its users to associate its materiality with various sorts of activities in everyday life (individual mobile listening, music sharing, algorithmic connections), and with other material objects (computers, earphones) and media (music social media). As an iconic object that accompanies the various moments of users’ everyday lives, the iPod embodies the new possibilities and directions of music consumption in the digital age of technologies and entangles issues that emerge in contemporary society, such as the increasing blurry separation between individual experiences and social structures.     

Cross-border mobility,transnationality and ethnicity as resources: european Somalis’ post-migration mobility practices

Based on a qualitative study, this article explores post-migration mobility practices developed by Somali women and men who have settled in Europe. It focuses on the ‘politics of mobility’, considering cross-border mobility an unequally distributed resource through which people access different forms of capital, and thus an element of social differentiation. The article reveals that respondents invest resources in places other than those where they acquired them, benefiting from a favourable symbolic exchange rate between the different places. Furthermore, while a significant part of the economic, social and cultural capital of these migrants is acquired within ethnically diversified contexts, it is mostly reinvested in networks and places where their Somali ethnicity becomes an asset—either in ethnically homogeneous networks or in activities that address Somali people's needs. Cross-border mobility, transnationality and ethnicity become core resources that enable these migrants to mobilise their capital where it can be valued most highly and to access advantageous social positions, thus fostering upward social mobility. The article argues that these strategies are less the result of an identity-based ethnic preference than a compensatory mechanism implemented by people who have few prospects of having their assets valued within the wider networks in their country of residence.