Comparing behavior under risk and under ambiguity in a lifecycle experiment

Experiments on intertemporal consumption typically show that people have difficulties in optimally solving such problems. Previous studies have focused on contexts in which agents are faced with risky future incomes and have to plan over long horizons. We present an experiment comparing decision making under certainty, risk, and ambiguity, over a shorter lifecycle. Results show that behavior in the ambiguity treatment is markedly different than in the risk condition and it is characterized by a significant pattern of under-consumption.     

A Quantitative Estimate of Leukemia Mortality Associated with Occupational Exposure to Benzene3

In 1980, the U.S. Supreme Court vacated a revised occupational standard for benzene, stating that the Occupational Safety and Health Administration (OSHA) had failed to demonstrate that significant health risks existed under the current standard. This decision has been interpreted by OSHA as requiring the consideration of quantitative risk assessments, whenever possible, in the development of regulations for occupational carcinogens. In light of this decision, the available epidemiologic evidence was used to generate a quantitative risk assessment for benzene. Uncertainties regarding the levels and lengths of benzene exposure for the studied cohorts were incorporated into the analysis. Based on the one-hit model, the assessment indicates that a working lifetime exposure to benzene at the current permissible exposure level (10 ppm) poses a substantial excess risk of death from leukemia. This report discusses the calculation of the risk estimates, the basis for relying on certain assumptions, and the inherent limitations of using epidemiologic studies to quantify cancer risks.     

Individual vs. group decision-making: an experiment on dynamic choice under risk and ambiguity

This paper focuses on the comparison of individual and group decision-making, in a stochastic inter-temporal problem in two decision environments, namely risk and ambiguity. Using a consumption/saving laboratory experiment, we investigate behaviour in four treatments: (1) individual choice under risk; (2) group choice under risk; (3) individual choice under ambiguity and (4) group choice under ambiguity. Comparing decisions within and between decision environments, we find an anti-symmetric pattern. While individuals are choosing on average closer to the theoretical optimal predictions, compared to groups in the risk treatments, groups tend to deviate less under ambiguity. Within decision environments, individuals deviate more when they choose under ambiguity, while groups are better planners under ambiguity rather than under risk. Our results extend the often observed pattern of individuals (groups) behaving more optimally under risk (ambiguity), to its dynamic dimension.

     

Policies and practices of diversity: reimagining possibilities for new discourses

The processes of globalization have demanded that emergent countries include issues of diversity into their political, economic and educational agendas. Consequently, educational institutions have started, in order to adscribe to requests made by transnational organizations (UNESCO, the World Bank and OECD), to include diversity as a priority to develop curricular proposals and policies for education. This article critiques how diversity discourses have been produced and circulated through public policies within the Chilean educational context. The design of new special education policies in Chile provides a critical context for the uses of diversity, how it is framed and what are the discourses associated with diverse educational contexts. The discussion is organized around two main questions: what are the main discourses of diversity produced by policies and practices and what do policies on diversity do?     

Community college field placement internships: supervisors’ perspectives and recommendations

ABSTRACT

Community College human services students represent the future social service workforce. The defining feature of their training is 250 h supervised field placement internship. Despite burgeoning research describing best practices for supervision of Bachelors of social work (BSW) and Masters of social work (MSW), there is no research aimed at supervision for community college students, leaving a gap in our understanding of best practices for supporting community college students’ pedagogy and sustaining partnerships with agencies. This exploratory study offers recommendations for best practices supported by our discovery of the benefits, challenges, and strategies involved with offering community college student internships in New York City human services agencies. We analyzed data from semi-structured interviews with 30 field supervisors through qualitative content analysis. Community college students and agencies both benefit substantially from the field placement, however agencies identified significant social and structural challenges specific to working with community college students that require interventions for both field supervisors and students alike. Suggested interventions aimed at improving supervisor training, procedures for focusing goals of supervision sessions, assisting students in meeting their academic and social needs, as well as supporting supervisors’ professional goals to promote best practices are proposed.     

Exurban residential subdivision development: Effects on water quality and public perception

We investigated how future alternative designs for exurban residential subdivision development in agricultural landscapes might affect aquatic ecosystems and public perceptions, and we asked whether better aquatic ecological quality would correspond with public perceptions of greater landscape attractiveness. The alternative exurban futures we compared were: ecologically beneficial subdivisions, conventional subdivisions, and conventional agriculture. To judge their aquatic ecology effects we measured the chemistry and biota of six first-order streams within our study area, the Huron and Raisin River watersheds in the Detroit CMSA. We chose two stream catchments that exhibited land cover to represent the same proportions as each of three types of alternative exurban futures. Streams in catchments representing ecologically beneficial subdivision designs had the most total macroinvertebrate taxa, the most sensitive macroinvertebrate taxa, lowest nitrates, lowest total phosphorus, and lowest total suspended materials. Nutrient concentrations were highest in agricultural catchments, and suspended sediments were highest in conventional subdivision catchments. To compare public perceptions of the alternative futures, we surveyed 336 suburban and exurban adult residents of the upper Midwest. All respondents viewed digital imaging simulations of each of the futures and rated their attractiveness as if they were seen from the window of a home in the area. Ecologically beneficial futures were perceived as most attractive. Comparing the alternative futures, rankings of aquatic ecological quality were consistent with public perceptions of attractiveness.