MODELING THE ECONOMIC INTERACTION OF AGENTS WITH DIVERSE ABILITIES TO RECOGNIZE EQUILIBRIUM PATTERNS

We model differences among agents in their ability to recognize temporal patterns of prices. Using the concept of DeBruijn sequences in two dynamic models of markets, we demonstrate the existence of equilibria in which prices fluctuate in a pattern that is independent of the fundamentals and that can be recognized only by the more competent agents. (JEL: C7, D4, S477)     

Values in Middle Childhood: Social and Genetic Contributions

Theories of value development often identify adolescence as the period for value formation, and cultural and familial factors as the sources for value priorities. However, recent research suggests that value priorities can be observed as early as in middle childhood, and several studies, including one on preadolescents, have suggested a genetic contribution to individual differences in values. In the current study, 174 pairs of monozygotic and dizygotic seven‐year‐old Israeli twins completed the Picture‐based Value Survey for Children (PBVS–C). We replicated basic patterns of relations between value priorities and variables of socialization—gender, religiosity, and socioeconomic status—that have been found in studies with adults. Most important, values of Self‐transcendence, Self‐enhancement, and Conservation, were found to be significantly affected by genetic factors (29 percent, 47 percent, and 31 percent, respectively), as well as non‐shared environment (71 percent, 53 percent, and 69 percent, respectively). Openness to change values, in contrast, were found to be unaffected by genetic factors at this age and were influenced by shared (19 percent) and non‐shared (81 percent) environment. These findings support the recent view that values are formed at earlier ages than had been assumed previously, and they further our understanding of the genetic and environmental factors involved in value formation at young ages.     

Health behaviors of culturally diverse inner-city community college students

ABSTRACT

Objective: To determine the prevalence of risk behaviors related to cigarette use, alcohol use, nutrition, physical fitness, and sexual behavior. Participants: Participants were 1,075 students attending an urban community college during the Spring 2012 semester. Methods: Data were collected in randomly selected classes using the American College Health Association National College Health Assessment II (ACHA-NCHA II) paper survey and analyzed using Statistical Package for the Social Sciences (SPSS) version 22 for frequencies and chi-square test of independence. Results: The sample population reported poor diet, low rates of physical activity, high rates of overweight/obesity, low rates of condom use for vaginal sex, multiple sexual partners, and unintentional pregnancy. Protective health behaviors included low rates of cigarette smoking and alcohol use, high rates of condoms use for anal sex, and high rates of human immunodeficiency virus (HIV) testing. Conclusion: Students are at high risk for health problems related to poor diet, lack of exercise, and risky sexual behaviors. Additional research is recommended to determine the most effective intervention strategies.     

The Inclusion of Minority Groups in Clinical Trials: Problems of Under Representation and Under Reporting of Data

Objective: To evaluate the representation of minority groups in randomized control trials (RCTs), and the frequency with which this information is reported.

Study Design: Reviewers collected data on the racial/ethnic composition of study samples from all RCTs published in six leading medical journals in 1999.

Results: Of the 280 RCTs, most (204, 71.3%) provided no information on the race/ethnicity of participants. Of the 89 U.S.-based RCTs, 50 (56.1%) reported their minority distribution. Relative to other trials, those funded by the National Institute of Health (NIH) (n = 52) were more likely to report race/ethnicity data (55.8% vs. 23.7%; χ² = 20.9, p ≤ 0.001) and to include nonwhite participants (13.5% vs. 12.5%; χ² = 22.7, p ≤ 0.001).

Conclusion: Minority groups are currently under-represented in clinical trials. Information on the race and ethnicity of clinical trial participants is currently underreported in six leading medical journals. Reporting of minority group information was significantly better only in NIH funded trials, which also were more likely to include nonwhite participants. This suggests that mandatory reporting policies may have a positive effect on both reporting and representation.     

Introduction: Welfare Reform: Preliminary Research and Unanswered Questions

This article summarizes the 1996 welfare reform act and introduces a set of key questions that remain unanswered as initial results concerning the effects of welfare reform are being analyzed and discussed by policymakers andresearchers. We introduce the collection of articles presented in this issue of the Journal of Social Issues, which are devoted to the topic of welfare reform and its potential ramifications for the well-being of families. The articles are grouped into three broad areas that represent major topics of interest to researchers, policy analysts, and others concerned with how welfare reform affects the lives of women and families: the politics of welfare reform, barriers to employment, and the impact of welfare reform on family life.     

The warlord as arbitrageur

This article seeks to generate a more precise understanding of the emergence and perpetuation of warlords. First, it offers a simple, intuitive, and empirically grounded conceptual definition of warlordism. Second, it argues that the primary factor contributing to the success of warlords is the ability to take advantage of price differentials for political, economic, and cultural goods across terrains—in a word, to arbitrage. Third, it illustrates this model with a case study of Khun Sa (1934–2007), the self-proclaimed Shan freedom-fighter and “king” of Burma’s heroin trade. Finally, it suggests that the international community rethink its commitment to the norm of sovereignty in order to combat the proliferation of such non-state violence-wielders.     

The meta-analytic framework for the evaluation of surrogate endpoints in clinical trials

For a number of reasons, surrogate endpoints are considered instead of the so-called true endpoint in clinical studies, especially when such endpoints can be measured earlier, and/or with less burden for patient and experimenter. Surrogate endpoints may occur more frequently than their standard counterparts. For these reasons, it is not surprising that the use of surrogate endpoints in clinical practice is increasing.     

INTERGENERATIONAL EFFECTS OF WELFARE REFORM: ADOLESCENT DELINQUENT AND RISKY BEHAVIORS

This study investigates effects of welfare reform in the United States on the next generation. Most previous studies of effects of welfare reform on adolescents focused on high‐school dropout of girls or fertility; little is known about how welfare reform has affected other teenage behaviors or boys. We use a difference‐in‐difference‐in‐differences framework to identify gender‐specific effects of welfare reform on skipping school, fighting, damaging property, stealing, hurting others, smoking, alcohol, marijuana, and other illicit drugs. Welfare reform led to increases in delinquent behaviors of boys as well as increases in substance use of boys and girls, with substantially larger effects for boys. (JEL K42, I12, I31, I38)