Asymmetric payoffs in simultaneous and sequential prisoner’s dilemma games

We investigate the role of payoff asymmetry in laboratory prisoner’s dilemma games. Symmetric and asymmetric games are examined in simultaneous and sequential settings. In the asymmetric sequential games, we study the impact of having payoff advantaged players moving either first or second. Asymmetry reduces the rates of cooperation in simultaneous games. In sequential games, asymmetry interacts with order of play such that the rate of cooperation is highest when payoff disadvantaged players move first.     

Rational Choice and Politics

The rational-choice approach brings scientific deductive methods to bear on politics. Appropriate methods are derived from physics, when actors interact probabilistically but non-rationally, and from game theory when they interact rationally. Collective action problems occur in the provision of public goods. As policies are themselves public goods, this leads to the game-theoretic analysis of voting, bureaucracy and lobbies. It is inconsistent to believe that economic actors are basically self-interested but that political actors are not. Rather, one should treat people as equally (not necessarily wholly) self-interested in each sphere. The paradoxes of social choice are then shown to have important implications for political science.     

Heterogenous demand for public goods: Behavior in the voluntary contributions mechanism

Numerous laboratory experiments have investigated the performance of several processes for providing public goods through voluntary contributions. This research has been able to identify features of the institution or environment which are reliably likely to produce outcomes “close” to the free riding outcome or “substantially” greater than the pessimistic prediction of standard models. One such feature is the “marginal per-capita return” (MPCR) from the public good. Various authors have altered MPCR between groups or for an entire group at the same time. The experiments reported here address a different question, “What would happen if, within a group, some persons faced a ‘high’ MPCR while others faced a ‘low’ MPCR?”     

The social context of adolescent self-esteem

The global self-esteem of adolescents was examined in relation to two aspects of their daily lives: (a) the perceived quality of their relationships with parents and peers; and (b) their self-evaluation in the areas of school, popularity, and athletics. The quality of relationships with parents made significant contributions to the explained variance in self-esteem of both boys and girls. The quality of peer relationships made a significant additional contribution for girls but not boys. The importance of parent and peer relationships to self-esteem did not vary as a function of age for either sex. Self-evaluation of popularity was related to girls' global self-esteem, while evaluation of school performance was more important for boys.Received her Ph.D. from George Peabody College. Research interests include adolescent stress and coping, and parent-child relationships.Received his M.D. from Medical College of Georgia. Research interests include stress, eating disorders, and pregnancy in adolescents.     

Interweaving Aboriginal/Indigenous Rights with Urban Citizenship: A View from the Winnipeg Low-Cost Housing Sector,Canada

State-society relations around low-cost housing in Canada changed from a period of strong federal leadership centred on social rights to a period of state retrenchment. A coalition of housing stakeholders from the public, private, and voluntary sectors self-organized in Winnipeg to create new low-cost housing following the 1993 discontinuation of federal social housing programs. This move toward urban citizenship was not received in the same way by Aboriginal peoples pursuing a distinctive set of rights centred on self-determination alongside common social (housing) goals. While Aboriginal rights are given regard at the federal level, they were not embedded in localized citizenship processes. Expanding the theorization of urban citizenship, the empirical results in this article reveal that discourses of democratic racism and cultural neutrality permeate mainstream views, running counter to Aboriginal citizenship pursuits.     

The forensic and investigative significance of reverse paternity testing with absent maternal sample

The authors are involved in the extraction of DNA material from calcified tissues, oftentimes teeth, and analysis of such material to assist the investigative process, frequently by confirming the identity of the victim. Biologic or molecular techniques for the purposes of human identification have evolved to allow increasingly discriminating tests for use in criminal and noncriminal death investigations, as well as paternity disputes. The goal of such tests is to either include 2 samples (ie, they are from the same person, or in the case of paternity, they are from related individuals) or exclude 2 samples (ie, they are from different people or from unrelated individuals). Regardless of the system used and when data error has been eliminated, an exclusionary conclusion is irrefutable. The probability of excluding the falsely accused has steadily increased over the years as new methods are developed. Conventional ABO blood typing, for example, has a probability of exclusion (PE) of only 17%. This value increases to 53% with the inclusion of the Rh and MN systems. Additional serological markers can provide a probability of exclusion of greater than 99%. Today, the current method of choice for human identification is the polymerase chain reaction for the amplification of short tandem repeat (STR) multiplexes. This paper discusses the implications of nonpaternity in reverse paternity testing when only paternal DNA is available.