The unconditional distributions of the OLS,TSLS and LIML estimators in a simple structural equations model

The exact distributions of the standard estimators of the structural coe?cients in a linear structural equations model conditional on the exogenous variables have been shown to have some unexpected and quirky features. Since the argument for conditioning on exogenous (ancillary) variables has been weakened over the past 20 years by the discovery of an “ancillarity paradox,” it is natural to wonder whether such finite sample properties are in fact due to conditioning on the exogenous variables. This article studies the exact distributions of the ordinary least squares (OLS), two-stage least squares (TSLS), and limited information maximum likelihood (LIML) estimators of the structural coe?cients in a linear structural equation without conditioning on the exogenous variables.     

Devenir victime des pesticides. Le recours au droit et ses effets sur la mobilisation des agriculteurs Phyto-victimes

This article analyses the effects of legal action on the mobilisation of farmworkers suffering from illnesses they link to the use of pesticides. It draws on a qualitative survey conducted with members of the Phyto-Victims Association, a protest organization comprising sick farmworkers, their families and the legal professionals who support them. Using this material, we retrace the paths taken by these farmworkers to obtain recognition for their status as pesticide “victims”. We describe the ambiguous effects of the law on this process at the individual and collective levels. We show how the law helps the farmworkers to see their illness as an injury requiring compensation and to consider themselves as “occupational victims”. We also suggest that legal action prevents a full exploration of the responsibilities involved, and may trap farmworkers in a reductive face-off with pesticide producers.     

A finite mixture model for multivariate counts under endogenous selectivity

We describe a selection model for multivariate counts, where association between the primary outcomes and the endogenous selection source is modeled through outcome-specific latent effects which are assumed to be dependent across equations. Parametric specifications of this model already exist in the literature; in this paper, we show how model parameters can be estimated in a finite mixture context. This approach helps us to consider overdispersed counts, while allowing for multivariate association and endogeneity of the selection variable. In this context, attention is focused both on bias in estimated effects when exogeneity of selection (treatment) variable is assumed, as well as on consistent estimation of the association between the random effects in the primary and in the treatment effect models, when the latter is assumed endogeneous. The model behavior is investigated through a large scale simulation experiment. An empirical example on health care utilization data is provided.     

Gender wage differentials in Italy: a structural estimation approach

This paper studies gender wage differentials by providing a maximum likelihood structural estimation of the frictional parameters of an equilibrium search model with on-the-job search and firm heterogeneity. In a second step, I also consider the role of discrimination. Results indicate higher level of search frictions for women; this result is confirmed by various robustness checks and by different specification and estimation strategies. I also find that the resulting mapping from productivity to wages for men is highly non-linear, while for women it is almost linear. Search, productivity and discrimination play different roles in shaping the gender differential depending on the specification and estimation of the model.     

Beyond the “silo view” of strategic management and corporate governance: evidence from Fiat,Telecom Italia and Unicredit

While corporate governance and strategic management have for a long time suffered from artificial separation and, therefore, generally been tackled in a secluded manner, their combined organizational impact makes them stringently related to one another in the firms’ evolution. In this paper, we argue that, transcending the “silo view” of corporate governance and strategic management, time has come to acknowledge that, depending on circumstances and time periods, within a firm is possible to detect the relative dominance of corporate governance over strategic management, rather than the leadership of strategic management over corporate governance. Drawing on a contingency approach, we dissect the relationships (and the mechanisms that control it) between the strategic function (i.e., which defines the firms’ strategy and supervisions its implementation) and the governance function (i.e., the congruence assessment between the firm strategy selected and the interests of the ownership and of other relevant stakeholders represented in the board of directors and the effectiveness appraisal of the entrepreneurial action). Then, by performing a thorough retrospective qualitative analysis of three relevant case-histories of Italian firms (Fiat, Telecom Italia and Unicredit) operating in three different industries (automobile, banking and telecommunications), we surmise that, either in corporate governance (board) oriented or in strategic management (CEO) oriented companies, the ‘real’ problems arise when the quality of corporate governance or strategic management is poor. Interestingly, we eventually suggest to adopt a value-based approach to the relationship between corporate governance and strategy that may fruitfully complement the contingency perspective taken at the onset of the work.     

Social work and social control in the penitentiary system: an empirical study in northern Italy

In Italy there is a prison and probation system based on a rehabilitative model, which is connected with social policies and entrusts relevant tasks to the helping professions. Among these, social work is affected by changes in social policies, marked by the influence of neoliberal thought. Contemporary sociological studies highlight the transition from a model mainly focused on ensuring social welfare, to a model in which the dominant interest is to increase effective social control. In this transition there has been an impoverishment of social protection for the most vulnerable segments of the population. This article presents the results of a qualitative research study carried out in northern Italy, among professionals working in the penitentiary sector (mainly social workers). Research has focused on the representations of the respondents on specific issues, including: the relationship between the crisis of the welfare state and the penal-welfare system; the culture of control and the changes in the role of social workers. Results show, inter alia, that social workers reject punitive responses, especially those towards the most disadvantaged social groups. Moreover, in this crisis of the welfare state and the rehabilitative model, political ideals, felt by the entire professional community, seem to be lacking.     

Capital‐skill Complementarity and Inequality: A Macroeconomic Analysis

The supply and price of skilled labor relative to unskilled labor have changed dramatically over the postwar period. The relative quantity of skilled labor has increased substantially, and the skill premium, which is the wage of skilled labor relative to that of unskilled labor, has grown significantly since 1980. Many studies have found that accounting for the increase in the skill premium on the basis of observable variables is difficult and have concluded implicitly that latent skill‐biased technological change must be the main factor responsible. This paper examines that view systematically. We develop a framework that provides a simple, explicit economic mechanism for understanding skill‐biased technological change in terms of observable variables, and we use the framework to evaluate the fraction of variation in the skill premium that can be accounted for by changes in observed factor quantities. We find that with capital‐skill complementarity, changes in observed inputs alone can account for most of the variations in the skill premium over the last 30 years.     

Asylum seekers in Europe: the warm glow of a hot potato

The Common European Asylum System calls for increased coordination of the European Union (EU) countries’ policies towards asylum seekers and refugees. In this paper, we provide a formal analysis of the effects of coordination, explicitly modelling the democratic process through which policy is determined. In a symmetric, two-country citizen-candidate setup, in which accepting asylum seekers in one country generates a cross-border externality in the other, we show that coordination is desirable. Internalizing the externality leads to a welfare improvement over the non-cooperative outcome. However, contrary to suggestions by many observers, we show that allowing for cross-country transfers in the cooperative outcome leads to a welfare inferior outcome because the possibility of compensation exacerbates strategic delegation effects.

One-sided synthetic control charts for monitoring the multivariate coefficient of variation

Shewhart's type control charts for monitoring the Multivariate Coefficient of Variation (MCV) have recently been proposed in order to monitor the relative variability compared with the mean. These approaches are known to be rather slow in the detection of small or moderate process shifts. In this paper, in order to improve the detection efficiency, two one-sided Synthetic charts for the MCV are proposed. A Markov chain method is used to evaluate the statistical performance of the proposed charts. Furthermore, computational experiments reveal that the proposed control charts outperform the Shewhart MCV control chart in terms of the average run length to detect an out-of-control state. Finally, the implementation of the proposed chart is illustrated with an example using steel sleeves data.