Duty to Warn and Intervention with HIV-Positive Clients

Complex ethical and legal issues are involved when an HIV-positive client presents a danger to others as a result of engaging in unprotected sex or needle sharing. This article presents a detailed assessment-and-intervention model that is based on the integration of ethical and legal principles with information about the level of risk associated with a client\u27s behavior, the HIV status of the client, and the sexual or needle-sharing partner\u27s awareness of the client\u27s HIV status. Appropriate interventions, including the duty to warn, are identified for each of the risk levels

Print Advertisement Characteristics and Apple Variety Attraction: A Mimic Model Approach

A structural latent variable model of apple variety demand is used to analyze the effect of variety specific newspaper advertisement characteristics on variety attraction (preferences), and in turn on variety demand. The influence of advertisement size, the use of color and the Washington apple logo were analyzed. The estimated variety attraction variable is important in explaining demand. Model specifications which exclude this variable tend to understate demand elasticities. Advertisement size has a positive impact on Granny Smith, Fuji, and Gala sales. Red Delicious sales are positively influenced by color ads, but negatively affected by ads with the Washington apple logo.Apple demand, newspaper advertisements, structural latent variable model, Marketing,

DYNAMIC COMPLEMENTARITY IN EXPORT PROMOTION: THE MARKET ACCESS PROGRAM IN FRUITS AND VEGETABLES

Government-supported promotion in foreign markets may justified when market failures exist, such as spillover externalities, where promotion of one commodity positively influences exports of another, or when market uncertainties cause planning horizons to be shorter than the persistent effects of promotion. A dynamic model of U.S. apple, almond, grape, and wine export supply is developed to test for these market failures. Promotion is viewed as an investment in establishing and maintaining a productÂ’'s image. Evidence supporting the existence of each market failure is found. Exporters and program administrators may fail to account for them in export promotion planning.International Relations/Trade,

A 5-kW xenon ion thruster lifetest

The results of the first life test of a high power ring-cusp ion thruster are presented. A 30-cm laboratory model thruster was operated steady-state at a nominal beam power of 5 kW on xenon propellant for approximately 900 hours. This test was conducted to identify life-timing erosion modifications, and to demonstrate operation using simplified power processing. The results from this test are described including the conclusions derived from extensive post-test analyses of the thruster. Modifications to the thruster and ground support equipment, which were incorporated to solve problems identified by the lifetest, are also described

Native American Obesity: An Economic Model of the "Thrifty Gene" Theory

Native American obesity and the associated health conditions are generally thought to result in part from a genetic predisposition to overeating fats and carbohydrates, called the "thrifty gene." Although coined by nutritional scientists, this study maintains the origin of the thrifty gene lies in economics. Apparently harmful overconsumption and addiction constitute economically rational behavior if the increment to current utility from adding to one's stock of "consumption capital" is greater than the present value of utility lost in the future due to ill health and the costs of withdrawal. Tests of these conditions for such "rational addiction" are conducted using two-stage household production approach. The results obtained by estimating this model in a panel of Native and non-Native supermarket scanner data show that both Natives and non-Natives tend to be inherently forward-looking in their nutrient choices, but Natives tend to have far higher long-run demand elasticities for carbohydrates compared to non-Natives. Consequently, reductions in real food prices over time, primarily among foods that are dense in simple carbohydrates, leads Native Americans to over-consume potentially harmful nutrients relative to their traditional diet.Type II diabetes, household production, Native Americans, demand estimation, shadow values., Food Consumption/Nutrition/Food Safety,

A BILATERAL COMPARISON OF FRUIT AND VEGETABLE CONSUMPTION: U.S AND CANADA

A structural latent variable model tests the role quality and information play in explaining observed differences in Canadian and U.S. produce consumption (5.0 vs. 3.5 servings/day). Dietary health information is significant in expanding demands. Quality promotes fruit consumption in Canada, consistent with the Alchian-Allen prediction.Food Consumption/Nutrition/Food Safety,

THE ECONOMIC VALUE OF PUBLIC RELATIONS EXPENDITURES: FOOD SAFETY AND THE STRAWBERRY CASE

Food safety has become an important issue affecting public health and grower profits. Outbreaks of foodborne illnesses are typically accompanied by press accounts of the incident and a decrease in demand. This study estimates the short- and long-run impacts of adverse and positive information delivered through print media on strawberry grower profits. Positive information may arise as apart of the promotional efforts of grower associations. It is found that adverse information reduces grower profits, but that positive information can partially offset their effects. It is suggested that grower groups could redirect funds used for promotion to food safety initiatives.Food Consumption/Nutrition/Food Safety,

Microanalysis of extended-test xenon hollow cathodes

Four hollow cathode electron sources were analyzed via boroscopy, scanning electron microscopy, energy dispersive x ray analysis, and x ray diffraction analysis. These techniques were used to develop a preliminary understanding of the chemistry of the devices that arise from contamination due to inadequate feed-system integrity and improper insert activation. Two hollow cathodes were operated in an ion thruster simulator at an emission current of 23.0 A for approximately 500 hrs. The two tests differed in propellant-feed systems, discharge power supplies, and activation procedures. Tungsten deposition and barium tungstate formation on the internal cathode surfaces occurred during the first test, which were believed to result from oxygen contamination of the propellant feed-system. Consequently, the test facility was upgraded to reduce contamination, and the test was repeated. The second hollow cathode was found to have experienced significantly less tungsten deposition. A second pair of cathodes examined were the discharge and the neutralizer hollow cathodes used in a life-test of a 30-cm ring-cusp ion thruster at a 5.5 kW power level. The cathodes' test history was documented and the post-test microanalyses are described. The most significant change resulting from the life-test was substantial tungsten deposition on the internal cathode surfaces, as well as removal of material from the insert surface. In addition, barium tungstate and molybdate were found on insert surfaces. As a result of the cathode examinations, procedures and approaches were proposed for improved discharge ignition and cathode longevity

Strategic Interaction With Multiple Tools: A New Empirical Model

The Lanchester model of strategic interaction typically considers only two-firm rivalry and one strategic tool. This paper presents an alternative that considers rivalry among several firms using multiple tools. Marketing decisions are dynamically optimal and use equations of motion for market share that are consistent with optimal consumer choice. Using a single-market case study that consists of five years of monthly data on ready to eat cereal sales, advertising, product development investments and new product introductions, we test our model against a similar Lanchester specification. Non-nested specification tests fail to reject the proposed model, but reject the Lanchester alternative.advertising, brands, cereal, dynamic, Lanchester, oligopoly, strategic interaction., Marketing,

RETAIL CONTRACTING AND GROWER PRICES

Contracting directly between produce shippers and retailers is growing in importance. Retailers seek to obtain reliable supplies, while reducing their reliance on recurring market transactions. Producers seek stable prices and market access. These private transactions diminish spot market liquidity and enhance noncompetitive buying opportunities, raising concerns over the resulting impact on grower prices, whether under contract or not, and the future produce market structure. Primary data are used to test hypotheses on contract participation. Simulations on grower prices reveal that contract prices are generally lower, but less variable, than market prices, suggesting a form of risk sharing.Marketing,