The mutual benefit movement in Chile from its origins to the present time (1853-1992)

The mutual benefit movement in Chile first appeared with the beginnings of industrialization and urbanization from the 1830s onwards. The first associations of urban workers emerged in 1853: this was followed by an initial period of expansion of mutual benefit activities until 1890. Almost all the urban trades were represented. During this period the mutual benefit movement was the principal organizing force for popular demands. From the 1890s onwards mutual benefit — linked with the workers'movement — grew rapidly and entered on a process of unification. Encouraging the development of the trade union movement, it took a leading part in determining the shape of the people's movements and maintained this role until 1924: this period marked the high point of mutual benefit activities in Chile. Mutual benefit organizations defended workers'demands and the boundaries between mutual benefit and trade union organizations were quite fluid. But the adoption of the social legislation and the support offered by certain leaders of the mutual benefit movement to the military dictatorship marked the beginning of the movement's decline. Efforts were then made to extend its scope of activities and unify the mutual benefit movement in Chile and in Latin America as a whole. The results of this were limited and the crisis continued after the Second World War. The 1973 coup d'état aggravated the situation still further. Today, with the virtual destruction of social security and its replacement by a system of private insurance schemes, one needs to ask whether the Chilean mutual benefit movement, which at one time was the principal form of popular organization, has a future.     

To What Extent Did Ethnicity and Economic Issues Matter in the 2007 Disputed Kenyan Elections?

This article assesses the key factors that influenced the intention to vote in the 2007 presidential election in Kenya, using data from a survey and other external datasets. Ethnicity was found to be one of the main factors. However, access to private and public goods, poverty and differences in wealth across ethnic groups also mattered, depending on how the voter claimed to be self‐identified. Those who self‐identified in terms of their ethnicity were influenced the most by access to services such as schools, health clinics and police stations, evidence suggesting that voters use ethnicity as a proxy to gauge which candidates will give them greater access to services provided by the state.     

The classification of parametric choices under uncertainty: analysis of the portfolio choice problem

This paper describes the admissible classes of parametric distribution functions of return portfolios and analyzes their consistency with the maximization of the expected utility. In particular, we present a general theory and a unifying framework with the following aims: (1) studying the implications of the classical market restrictions on the portfolio distributions; (2) establishing general rules of ordering, when the uncertain prospect depends by a finite number of parameters; (3) understanding how a dispersion measure has to be used, in order to obtain the investors' optimal portfolios.     

Stages of change and engagement in a family intervention

Prochaska and DiClemente's stages of change model facilitate understanding of engagement difficulties in psychosocial intervention processes. We assessed the link between stages of family change and intervention dropout in a sample of 141 families with relational conflicts between parents and adolescent children. Each family member's stage of change was defined according to three criteria: seeing the conflict as a relational problem, assuming part of the responsibility for the dysfunctional relationship, and understanding one's own mental and emotional states and those of the other family members involved in the conflict (mentalization). Our dropout rate for the sample was 41.8% and was higher for immigrant families. We found a strong association between engagement and the contemplation stage of change, particularly the mother's. In family conflict interventions, participation of all the family members is essential so as raise awareness of the relational aspects of the conflict and the shared responsibility for the conflict and its resolution.     

Habitat selection by an avian top predator in the tropical megacity of Delhi: human activities and socio-religious practices as prey-facilitating tools

Research in urban ecology is growing rapidly in response to the exponential growth of the urban environment. However, few studies have focused on tropical megacities, and on the interplay between predators’ habitat selection and human socio-economic aspects, which may mediate their resilience and coexistence with humans. We examined mechanisms of breeding habitat selection by a synanthropic raptor, the Black Kite Milvus migrans, in Delhi (India) where kites mainly subsist on: (1) human refuse and its associated prey-fauna, and (2) ritualised feeding of kites, particularly practised by Muslims. We used mixed effects models to test the effect of urban habitat configuration and human practices on habitat selection, site occupancy and breeding success. Kite habitat decisions, territory occupancy and breeding success were tightly enmeshed with human activities: kites preferred areas with high human density, poor waste management and a road configuration that facilitated better access to resources provided by humans, in particular to Muslim colonies that provided ritual subsidies. Furthermore, kites bred at ‘clean’ sites with less human refuse only when close to Muslim colonies, suggesting that the proximity to ritual-feeding sites modulated the suitability of other habitats. Rather than a nuisance to avoid, as previously portrayed, humans were a keenly-targeted foraging resource, which tied a predator’s distribution to human activities, politics, history, socio-economics and urban planning at multiple spatio-temporal scales. Many synurbic species may exploit humans in more subtle and direct ways than was previously assumed, but uncovering them will require greater integration of human socio-cultural estimates in urban ecological research.

     

An Economic Model of Friendship: Homophily,Minorities, and Segregation

We develop a model of friendship formation that sheds light on segregation patterns observed in social and economic networks. Individuals have types and see type‐dependent benefits from friendships. We examine the properties of a steady‐state equilibrium of a matching process of friendship formation. We use the model to understand three empirical patterns of friendship formation: (i) larger groups tend to form more same‐type ties and fewer other‐type ties than small groups, (ii) larger groups form more ties per capita, and (iii) all groups are biased towards same‐type relative to demographics, with the most extreme bias coming from middle‐sized groups. We show how these empirical observations can be generated by biases in preferences and biases in meetings. We also illustrate some welfare implications of the model.     

Unconditional Quantile Regressions

We propose a new regression method to evaluate the impact of changes in the distribution of the explanatory variables on quantiles of the unconditional (marginal) distribution of an outcome variable. The proposed method consists of running a regression of the (recentered) influence function (RIF) of the unconditional quantile on the explanatory variables. The influence function, a widely used tool in robust estimation, is easily computed for quantiles, as well as for other distributional statistics. Our approach, thus, can be readily generalized to other distributional statistics.     

The Role of Community in Migration Dynamics

Abstract. In this paper, I have presented a theoretical model that investigates the observable hysteresis process in migration dynamics. In the model the migration choice depends not only on wage differential, but also on a U‐shaped benefit function of a community of homogenous ethnic individuals, according to the ‘theory of clubs’. The results, based on real option theory, explain that observable ‘jumps’ in migration flows could depend not only on exogenous shocks, but also on two endogenous variables: the number of coordinated immigrants and the dimension of the community. Indeed, migration choice is delayed until a critical mass of immigrants is reached and possible rigidities of optimal district size could magnify this hysteresis process.     

Estimating Age: College Males Versus Convicted Male Child Sex Offenders

Two samples, male college students and convicted male child sex offenders, are compared on their abilities to accurately estimate the age group of a series of photographs of a sole female ranging in age from 11 to 29. Both samples tend to overestimate the age group of the subject photos, and no significant difference was found between college students and convicted child sex offenders in their ability to estimate the age of females. Both groups are compared demographically, and only limited differences were found. The implications are discussed in regard to theory and prevention of child sexual abuse.