Social Network and Wage: Evidence from Cameroon

Using Cameroonian data, this paper investigates the effects of social network on wage. Social network is measured in terms of using friends and relatives while looking for a job. In order to evaluate the effectiveness of social network with regard to wage, we make use of Heckman selection model. Our findings contrast with previous studies. After factoring the endogeneity and sample selection, we find that Job seekers who make use of social network exhibit a wage premium of 1.53 per cent of average wage. We also find that social network contributes to explain wage differential according to gender and institutional sectors (formal versus informal).     

ERRATA CORRIGE: “ARE MUSLIM IMMIGRANTS DIFFERENT IN TERMS OF CULTURAL INTEGRATION?”

We are thankful to Michael Lundholm and Mahmood Arai for pointing us towards a coding error which invalidates the regressions in our paper. Correcting the code leads to a decrease in sample sizes, though much smaller than Arai et al. (2011) claim based on their “replication”. An appropriate redefinition of the variables and of the model specification allows us to reproduce the substance of the empirical analysis in our original published paper. Although the results are now less clear‐cut, our analysis remains essentially unchanged.     

Local likelihood density estimation for interval censored data

The authors propose a class of procedures for local likelihood estimation from data that are either interval‐censored or that have been aggregated into bins. One such procedure relies on an algorithm that generalizes existing self‐consistency algorithms by introducing kernel smoothing at each step of the iteration. The entire class of procedures yields estimates that are obtained as solutions of fixed point equations. By discretizing and applying numerical integration, the authors use fixed point theory to study convergence of algorithms for the class. Rapid convergence is effected by the implementation of a local EM algorithm as a global Newton iteration. The latter requires an explicit solution of the local likelihood equations which can be found by using the symbolic Newton‐Raphson algorithm, if necessary.     

French Representations of Citizenship and Immigrants: The Political Dimension of the Civic Link

Representations of, and attitudes towards, foreigners take place within the complex system of values and meaning that constitutes what we call a national identity. In the French case, different conceptions of citizenship give rise to different attitudes towards immigrants. These conceptions, even if they could be related to antagonistic theories of democracy, blend together within the citizens' representations, giving the opportunity to combine advantages from each model, namely cohesion and inclusion. But the mix of citizenship representations occurs successfully only when the political dimension of citizenship is accepted. Where this is not the case, the antagonistic potential of both understanding of citizenship and immigrants develops and endangers the coherence of the civic and political national culture.     

POWER INSIDE THE FIRM AND THE MARKET: A GENERAL EQUILIBRIUM APPROACH

Recent years have witnessed an enormous amount of reorganization of the corporate sector in the United States and Europe. This article examines the role of market competition in this trend of corporate reorganization. We find that, at intermediate levels of competition, the CEO of the corporation decides to have less power inside the firm and to delegate control to lower levels of the firms' hierarchy. Workers' empowerment and the move to a flatter organizational structure emerge as an equilibrium when competition is not too tough and not too weak. The model predicts merger waves or waves of outsourcing when countries become more integrated in the global economy as the corporate sector reorganizes in response to an increase in international competition. (JEL: F12, D23, L22, L1)     

Estimation of the Sobol indices in a linear functional multidimensional model

We consider a functional linear model where the explicative variables are known stochastic processes taking values in a Hilbert space, the main example is given by Gaussian processes in L²([0,1])${\mathbb{L}}^2([0,1])$. We propose estimators of the Sobol indices in this functional linear model. Our estimators are based on U-statistics. We prove the asymptotic normality and the efficiency of our estimators and we compare them from a theoretical and practical point of view with classical estimators of Sobol indices.     

Nest design in a changing world: Great tit <Emphasis Type="Italic">Parus major</Emphasis> nests from a Mediterranean city environment as a case study

Investigations of urbanization effects on birds have focused mainly on breeding traits expressed after the nest-building stage (e.g. first-egg date, clutch size, breeding success, and offspring characteristics). Urban studies largely ignored how and why the aspects of nest building might be associated with the degree of urbanization. As urban environments are expected to present novel environmental changes relative to rural environments, it is important to evaluate how nest-building behavior is impacted by vegetation modifications associated with urbanization. To examine nest design in a Mediterranean city environment, we allowed urban great tits (Parus major) to breed in nest boxes in areas that differed in local vegetation cover. We found that different measures of nest size or mass were not associated with vegetation cover. In particular, nests located adjacent to streets with lower vegetation cover were not smaller or lighter than nests in parks with higher vegetation cover. Nests adjacent to streets contained more pine needles than nests in parks. In addition, in nests adjacent to streets, nests from boxes attached to pine trees contained more pine needles than nests from boxes attached to other trees. We suggest that urban-related alterations in vegetation cover do not directly impose physical limits on nest size in species that are opportunistic in the selection of nesting material. However, nest composition as reflected in the use of pine needles was clearly affected by habitat type and the planted tree species present, which implies that rapid habitat change impacts nest composition. We do not exclude that urbanization might impact other aspects of nest building behaviour not covered in our study (e.g. costs of searching for nest material), and that the strengths of the associations between urbanization and nest structures might differ among study populations or species.     

Dynamic stochastic dominance in bandit decision problems

The aim of this paper is to study the monotonicity properties with respect to the probability distribution of the state processes, of optimal decisions in bandit decision problems. Orderings of dynamic discrete projects are provided by extending the notion of stochastic dominance to stochastic processes.     

Sexual Orientation and Wage Discrimination in France: The Hidden Side of the Rainbow

This article is the first study to present an econometric evaluation of wage discrimination based on sexual orientation in the French labor market. Having identified same-sex couples using the French Employment Survey, we estimate the wage gap related to sexual orientation in the private and public sectors, in order to analyze whether or not lesbians and gays suffer a wage penalty. The results obtained show the existence of a wage penalty for homosexual male workers, as compared with their heterosexual counterparts, in both the private and public sectors; the magnitude of this discrimination varies from about ?6.5?% in the private sector, to ?5.5?% in the public sector. In the private sector, the wage penalty suffered by gay employees is higher for skilled workers than for the unskilled, and??in both sectors??the wage penalty is higher for older workers than for younger ones. As with many other countries, we do not find any evidence of the existence of a wage discrimination against lesbians.