Solidarity in choosing a location on a cycle

We study the implications of two solidarity conditions on the efficient location of a public good on a cycle, when agents have single-peaked, symmetric preferences. Both conditions require that when circumstances change, the agents not responsible for the change should all be affected in the same direction: either they all gain or they all loose. The first condition, population-monotonicity, applies to arrival or departure of one agent. The second, replacement-domination, applies to changes in the preferences of one agent. Unfortunately, no Pareto-efficient solution satisfies any of these properties. However, if agents’ preferred points are restricted to the vertices of a small regular polygon inscribed in the circle, solutions exist. We characterize them as a class of efficient priority rules.     

Brief des neuen DGS-Vorsitzenden anlässlich des schon etwas zurückliegenden Beginns seiner Amtszeit

Ohne Zusammenfassung     

Soziologisches Denken

Ohne Zusammenfassung     

“Sugar and Spice But Not Always Nice”: Gender Socialization and its Impact on Development and Maintenance of Aggression in Adolescent Girls

Aggression in girls is a problem that is gaining increased attention. The indirect forms of relational aggression historically used by girls to harm their victims are increasingly escalating into physical altercations. An understanding of the interplay between the developmental and contextual factors that contribute to learned aggression in girls is needed to inform program development that truly responds to the unique gender socialization of girls. This article examines parental, environmental, and peer factors for their contributions to the development of girls’ aggression. Implications for program development that teaches girls and their families alternative ways of expressing their needs and protecting themselves from harm is discussed.     

Out-of-Pocket Health Care Expenditures by Russian Consumers with Different Health Status

The paper uses the Russia Longitudinal Monitoring Survey 2003 database to study the types of official and shadow out-of-pocket health care expenditures by consumers with high and low health status. The analysis shows that the inability of less healthy people to pay unofficially for more effective outpatient care results in their higher demand for official inpatient and outpatient treatment. This pattern creates the need to sustain excessive inpatient facilities and slows down health care restructuring. Yet, since the state is incapable of fulfilling its obligations for providing free health care and meet the current demand, in inpatient institutions all consumers, and less healthy ones in particular, spend considerable sums on drugs, even though the latter are guaranteed to be free. Consequently, the current Russian health system itself leads to replacing outpatient with inpatient care, which is more costly both for the patients and for the state.      

Analysis of breeding bird communities along an urban-rural gradient in Berlin,Germany, by Hasse Diagram Technique

Breeding bird communities in Berlin were investigated at five study sites, which represent an structural urban-rural gradient, from densely built-up areas with sealed ground to green areas such as large parks. In this paper, we tested the Hasse Diagram Technique (HDT), an approach belonging to partial order theory, for its appropriateness to extract information about changes in species composition from our data set. As expected, the overall number of bird species was positively correlated with the urban-rural gradient, increasing from 12 found in the city center to 28 in an urban park. By HDT analysis, four different sub-groups of birds could be identified, contributing differentially to the increase in species number: (1) ubiquists, i.e., species found at each study site, (2) a sub-group, the species’ number of which was positively correlated with the urban-rural gradient, increasing with increasingly green areas, (3) a sub-group, the species’ number of which was negatively correlated with the urban-rural gradient, decreasing with a declining density of buildings, and (4) species, the distribution of which did not show any correlation with the urban-rural gradient. The results show that HDT is a suitable tool for formalized analysis of the pattern of species’ communities along an environmental gradient.