Cooperative provision of indivisible public goods

A community faces the obligation of providing an indivisible public good that each of its members is able to provide at a certain cost. The solution is to rely on the member who can provide the public good at the lowest cost, with a due compensation from the other members. This problem has been studied in a non-cooperative setting by Kleindorfer and Sertel (J Econ Theory 64:20–34, 1994). They propose an auction mechanism that results in an interval of possible individual contributions whose lower bound is the equal division. Here, instead we take a cooperative stand point by modelling this problem as a cost sharing game that turns out to be a ‘reverse’ airport game whose core is shown to have a regular structure. This enables an easy calculation of the nucleolus that happens to define the upper bound of the Kleindorfer–Sertel interval. The Shapley value instead is not an appropriate solution in this context because it may imply compensations to non-providers.     

La démocratisation de l'enseignement supérieur au Canada: la face cachée de la massification

The increase in available student placements at colleges and universities, the implementation of provincial and federal postsecondary education policies, and the rise of the educational aspirations of families and individuals have all led to the massification of Canadian higher education. Based on Merle's typology of the forms of democratization, this article attempts to revisit the theory of equality of opportunities by critically analyzing the link between massification of higher education and social equity. The results of an analysis of longitudinal data from the (YIT) Youth in Transition Survey show that at the age of 24 in 2008, approximately 77% of young Canadians have pursued studies in a college or university. If access to postsecondary education is now higher, to what extent has it improved social equity? The article shows, in light of the Merle's typology, that mass university education is achieved in part under the seal of a segregative democratization, while college education tends to be egalitarian. L'augmentation de la capacité d'accueil des collèges et des universités, la mise en ?uvre de politiques provinciales et fédérales de développement de l'enseignement postsecondaire et la montée des aspirations scolaires des familles et des individus ont contribué à massifier l'enseignement supérieur canadien. En se basant sur la typologie des formes de démocratisation de Merle, le présent article tente de revisiter la théorie de l'égalité des chances en s'interrogeant sur le lien entre la massification de l'enseignement supérieur et l'équité sociale. Les résultats obtenus à partir de données longitudinales provenant de l'Enquête auprès de jeunes en transition (EJET) montrent qu’à l'âge de 24 ans en 2008, environ 77 % des jeunes Canadiens ont poursuivi des études dans un collège ou une université. Si l'accès aux études postsecondaires est aujourd'hui plus élevé, dans quelle mesure celui‐ci a‐t‐il amélioré l’équité sociale? L'article montre, à la lumière de la typologie de Merle, que la massification de l'enseignement universitaire se réalise en partie sous le sceau d'une démocratisation ségrégative, tandis que l'enseignement collégial a tendance à être égalisateur.     

Mental Imagery and Production of Hand Gestures While Speaking in Younger and Older Adults

Speech and conversational hand gestures were recorded during interviews of 23 younger (M = 21 years) and 19 older adults (M = 70 years). Three kinds of questions were used in order to activate either visual images, motor images, or no mental image (abstract topics). On average, the rate of gesture production did not differ in younger and older adults, but it was significantly influenced by imagery conditions. Gesture production was higher in the motor than in the visual imagery condition, and lowest in the abstract condition. A significant interaction between age and imagery conditions influenced the proportion of representational gestures, which were relatively less frequent in older adults, especially in the visual imagery condition. Content analysis of verbal responses showed that imagery values did not differ in younger and older adults, but that concrete words were less frequent in responses to abstract questions than in the two other conditions. The implications of these results concerning the mechanisms of gesture production and the age-related changes in conversational behavior are discussed.     

Science news in the European dailies,the invisible network of the agenda setting

A survey of the development of press coverage of scientific and technical information in the main European dailies¹, reveals three major trends—a general explosion of coverage in the Community countries studied, an increasingly specialized body of science writers and, finally, a lack of control of the networks that communicate scientific information and ensure its recognition at an international level. Even though the subject matter is mainly international, science reporting in the daily press is still in fact a question of “jobbing”; and expresses all the cultural diversity of Europe.     

Socioeconomic determinants of the need for personal assistance reported by community-dwelling elderly: Empirical evidence from a French national health survey

A bivariate probit model with sample selection is used to estimate the conditional probability of reporting a need for personal assistance (NPA) with at least one activity of daily living among French community-dwelling elderly. 71.8% of men and 77.3% of women reported impairments and among those who reported impairments, 7.5% of men and 10.8% of women reported NPA. NPA is associated not only with age (i.e., the oldest individuals, for women only) and health status (such as a specific type of impairment), but also with socioeconomic (living with intermediate income; living with someone, partner or other) and environmental factors (having and using assistive technologies).     

On consistent testing for serial correlation in seasonal time series models

The author considers serial correlation testing in seasonal time series models. He proposes a test statistic based on a spectral approach. Many tests of this type rely on kernel-based spectral density estimators that assign larger weights to low order lags than to high ones. Under seasonality, however, large autocorrelations may occur at seasonal lags that classical kernel estimators cannot take into account. The author thus proposes a test statistic that relies on the spectral density estimator of Shin (2004), whose weighting scheme is more adapted to this context. The distribution of his test statistic is derived under the null hypothesis and he studies its behaviour under fixed and local alternatives. He establishes the consistency of the test under a general fixed alternative. He also makes recommendations for the choice of the smoothing parameters. His simulation results suggest that his test is more powerful against seasonality than alternative procedures based on classical weighting schemes. He illustrates his procedure with monthly statistics on employment among young Americans.     

DOES THE BETTER‐THAN‐AVERAGE EFFECT SHOW THAT PEOPLE ARE OVERCONFIDENT?: TWO EXPERIMENTS

We conduct two experimental tests of the claim that people are overconfident, using new tests of overplacement that are based on a formal Bayesian model. Our two experiments, on easy quizzes, find that people overplace themselves. More precisely, we find apparently overconfident data that cannot be accounted for by a rational population of expected utility maximizers who care only about money. The finding represents new evidence of overconfidence that is robust to the Bayesian critique offered by Benoît and Dubra (Jean‐Pierre Benoît and Juan Dubra (2011). “Apparent Overconfidence.” Econometrica, 79, 1591–1625). We discuss possible limitations of our results.