The concept of efficiency in groups postulates that a coalition of firms has to record a smaller distance toward the aggregate technology frontier compared with the sum of individual distances. Efficiency analysis (either allocative or technical) is defined with respect to cooperative firm game...

[eng] The inequalities of net annual wages, estimated via the Gini ratio, declined by about 8 % between 1976 and 2000. The indicator fell from 0.322 to 0.296. By using the Gini decomposition and dividing the French population by age group, gender, occupational category, and geographic area, we...

We propose a generalization of the decomposition by population subgroups of the α-Gini index, the so-called multi-level subgroup decomposition. We demonstrate that all components obtained from the decomposition, can integrate in their functional form a parameter of inequality sensitivity being...

[eng] In the second half of the period 1961-2000, the unemployment rate trended down in the United States and the United Kingdom, and trended up steadily in Germany, France, and Italy. Can we explain this divergence by assuming that the impact of wage demands on the value-added breakdown was...

We show in this paper that the growth rate of the Sen index is multi-decomposable, that is, decomposable simultaneously by subgroups and income sources. The multi-decomposition of the poverty growth yields respectively: the growth rate of the poverty incidence (poverty rate) decomposed by...

This research provides a new approach of decomposition. The multi-decomposition of the Gini index allows one to combine the two methods of decomposition: the decomposition by subgroup and the decomposition by income source. Thanks to the Italian income earners in 1989 and 2000, we illustrate...

For any given order of inverse stochastic dominance, standard concentration curves are decomposed into three components, called contribution curves. Those components correspond to within-group inequalities, between-group inequalities, and transvariational inequalities. We prove, for all orders,...