Price Floors and Competition

A potential source of instability of many economic models is that agents have little incentive to stick with the equilibrium. We show experimentally that this may matter with price competition. The control variable is a price floor, which increases the cost of deviating from equilibrium. Theoretically the floor allows competitors to obtain higher profits, as low prices are excluded. However, behaviorally the opposite is observed; with a floor competitors receive lower joint profits. An error model (logit equilibrium) captures some but not all the important features of the data. We provide statistical support for a complementary explanation, which refers to how "threatening" an equilibrium is. We discuss the economic import of these findings, concerning matters like resale price maintenance and auction design.Price competition; price floors; Bertrand model; experiment; salience; logit equilibrium; threats

Evaluating Measures of Fidelity for Substance Abuse Group Treatment With Incarcerated Adolescents

The evaluation of treatment fidelity has become increasingly important as the demand for evidence-based practice grows. The purpose of the present study is to describe the psychometric properties of two measures of treatment fidelity that can be used by therapists and supervisors - one for group-based cognitive–behavioral therapy (CBT) and one for combined Substance Education and Twelve-Step Introduction (SET) for adolescent substance use. At the end of group sessions (CBT n = 307; SET n = 279), therapists and supervisors completed an evaluation measure assessing adherence to certain core components of the intervention. The supervisor version of the fidelity measure also included items for rating the level of competency the therapist demonstrated when providing each component of the intervention. Results from split-half cross-validation analyses provide strong support for an 11-item, three-factor CBT fidelity measure. Somewhat less consistent but adequate support for a nine-item, two-factor SET fidelity measure was found. Internal consistencies ranged from acceptable to good for both the CBT and SET adherence scales and from acceptable to good for the CBT and SET competency scales, with the exception of the CBT practices competency scale. Preliminary validation of the measures suggests that both measures have adequate to strong factor structure, reliability, and concurrent and discriminant validity. The results of this study have implications for research and clinical settings, including the supervision process

Ethnicity as a moderator of motivational interviewing for incarcerated adolescents after release

Motivational interviewing (MI) has been found to be an effective treatment for substance using populations, including incarcerated adolescents. Although some studies suggest MI is more successful with individuals from minority backgrounds, the research remains mixed. The current study investigated the impact of ethnicity on treatment in reducing alcohol and marijuana use among incarcerated adolescents. Adolescents (14–19 years of age) were recruited from a state juvenile correctional facility and randomly assigned to receive MI or relaxation therapy (RT) (N = 147; 48 White, 51 Hispanic, and 48 African American; 126 male; 21 female). Interviews were conducted at admission to the facility and 3 months after release. Results suggest that the effects of MI on treatment outcomes are moderated by ethnicity. Hispanic adolescents who received MI significantly decreased total number of drinks on heavy drinking days (NDHD) and percentage of heavy drinking days (PHDD) as compared to Hispanic adolescents who received RT. These findings suggest that MI is an efficacious treatment for an ethnic minority juvenile justice-involved population in need of evidence-based treatments

Deletion of Irs2 causes reduced kidney size in mice: role for inhibition of GSK3β?

<p>Abstract</p> <p>Background</p> <p>Male <it>Irs2</it>^-/-mice develop fatal type 2 diabetes at 13-14 weeks. Defects in neuronal proliferation, pituitary development and photoreceptor cell survival manifest in <it>Irs2</it>^-/-mice. We identify retarded renal growth in male and female <it>Irs2</it>^-/-mice, independent of diabetes.</p> <p>Results</p> <p>Kidney size and kidney:body weight ratio were reduced by approximately 20% in <it>Irs2</it>^-/-mice at postnatal day 5 and was maintained in maturity. Reduced glomerular number but similar glomerular density was detected in <it>Irs2</it>^-/-kidney compared to wild-type, suggesting intact global kidney structure. Analysis of insulin signalling revealed renal-specific upregulation of PKBβ/Akt2, hyperphosphorylation of GSK3β and concomitant accumulation of β-catenin in <it>Irs2</it>^-/-kidney. Despite this, no significant upregulation of β-catenin targets was detected. Kidney-specific increases in Yes-associated protein (YAP), a key driver of organ size were also detected in the absence of <it>Irs2</it>. YAP phosphorylation on its inhibitory site Ser127 was also increased, with no change in the levels of YAP-regulated genes, suggesting that overall YAP activity was not increased in <it>Irs2</it>^-/-kidney.</p> <p>Conclusions</p> <p>In summary, deletion of <it>Irs2 </it>causes reduced kidney size early in mouse development. Compensatory mechanisms such as increased β-catenin and YAP levels failed to overcome this developmental defect. These data point to <it>Irs2 </it>as an important novel mediator of kidney size.</p

Do Students Value On-Campus Field-Based Education? A Case Study of Science Educational Initiatives in the Jock Marshall Reserve

Fieldwork, known for fostering more engaging and authentic learning experiences, is an established tradition in higher education which is changing; increasingly run on-campus for financial and logistical reasons and enhanced through education technologies to reflect industry practices. Here we examine student perceptions of on-campus fieldwork with the aim of understanding if on-campus fieldwork was valued and why, to be able to compare against literature on off-campus fieldwork. We explore student views on activities at the Jock Marshall Reserve, an on-campus nature reserve of Monash University, Australia using mixed-methods approach. An online survey targeted students undertaking four subjects across first to third year and received 116 responses. In alignment with off-campus fieldwork studies, we found that overwhelmingly respondents highly valued fieldwork with dominant reasons being; 1) developed skills relevant to ‘real-world’ science, 2) reinforced theoretical learning, and 3) was more engaging than traditional study, with some benefits to their wellbeing. The novel perceptions related to increased convenience and authenticity. Since a majority of respondents wished to undertake on-campus fieldwork more frequently, this study suggests that the inclusion of on-campus fieldwork should be considered within science curriculum in higher education