Income and Price Elasticities of Demand in South Africa: An Application of the Linear Expenditure System

This paper investigates the expenditure patterns of South African households using detailed cross‐sectional expenditure and price data that varies across region and time. Linear expenditure system parameter estimates are used to calculate income and price elasticities for a number of product categories at different points of the income distribution. We find substantial variation in the price and income elasticities of demand for items across the income distribution, with the bottom quartile being extremely sensitive to increases in the price of food and clothing items, and the top quartile being as sensitive as households in developed countries.     

Predicting future purchases with the Poisson log-normal model

The negative binomial distribution (NBD) has been widely used in marketing for modeling purchase frequency counts, particularly in packaged goods contexts. A key managerially relevant use of this model is Conditional Trend Analysis (CTA)—a method of benchmarking future sales utilizing the NBD conditional expectation. CTA allows brand managers to identify whether the sales change in a second period is accounted for by previous non-, light, or heavy buyers of the brand. Although a useful tool, the conditional prediction of the NBD suffers from a bias: it under predicts what the period-one non-buyer class will do in period two and over predicts the sales contribution of existing buyers. In addition, the NBD's assumption of a gamma-distributed mean purchase rate lacks theoretical support—it is not possible to explain why a gamma distribution should hold. This paper therefore proposes an alternative model using a log-normal distribution in place of the gamma distribution, hence creating a Poisson log-normal (PLN) distribution. The PLN distribution has a stronger theoretical grounding than the NBD as it has a natural interpretation relying on the central limit theorem. Empirical analysis of brands in multiple categories shows that the PLN distribution gives better predictions than the NBD.     

Graphic Geopolitics: An Interview with Comics Artist Joe Sacco

Joe Sacco is best known for works that blend journalism with the format and structure of comic books. Sacco’s prior work has considered themes of political conflict, legacies of violence, and marginalization across a range of geographic contexts, including Bosnia, the Middle East, and the United States. This interview, conducted by the authors with Joe Sacco on 16 November 2015, explores these and other themes in an attempt to situate the positionality and choices of the creator of geopolitical narratives in the broader literature on critical geopolitics. We consider the themes of subject, representation, audience response, and stylistic influences, among others, in our conversation.     

Do the physical facilities in restaurants match older Americans’ preferences?

This study investigated restaurants’ response to the aging population’s preferences. Gaps between previously identified preferences and current restaurant design were examined. The observational survey assessed: parking and outside accessibility, comfort and inside accessibility, menu readability, and restrooms. Occasional gaps were found even though restaurants were generally well-designed. Casual dining restaurants were more likely to meet consumer preferences as to the exterior, seating, and service. Limited-service restaurants better met preferences for the bathrooms, lighting, and sound. This information may be helpful when building or remodeling restaurants and may help restaurants to attract older customers.     

On tap: Foodservice operators’ perceptions of a wine innovation

An online survey explored foodservice operators’ (N = 57) perceptions of wine-on-tap, a recent trend in the United States. Adopters (39.1%) considered themselves more innovative, willing to take risks, and influential on others’ opinions than nonadopters (60.9%). Foodservice operators who currently offer wine-on-tap utilized interpersonal information sources (e.g., distributors) more frequently than nonadopters. Additionally, adopters perceived wine-on-tap’s characteristics more positively than nonadopters, indicating wine-on-tap was significantly easier to use than bottled wine. Among other implications, networking stood out as an important driver of innovative behavior in the foodservice industry.     

If only consumers knew: How sampling impacts wine innovation diffusion in the U.S. foodservice industry

A survey (n = 151) explored consumers’ experiences with wine-on-tap, a current trend in the U.S. foodservice industry. Wine consumers’ innovativeness (R² = .49) was explained by wine involvement, opinion leadership, and usage of information sources. Those who recently tried wine-on-tap (n = 43) were significantly more innovative (innovators) than those who never tried it (noninnovators). Furthermore, noninnovators expected to pay significantly less for a glass of wine-on-tap when compared with wine poured from a bottle. Contrary to expectations, the driving force for noninnovative behavior is lack of availability and awareness as opposed to a lack of interest in wine-on-tap.     

The role of calculative attachment in the relationship between diversity climate and retention

This study enhances our understanding of the complex relationship between diversity and employee retention. The study found that positive perceptions of an organization's “diversity climate” were related to decreased turnover intentions and found support for the proposition that calculative attachment mediated this relationship. In addition, the study considered potential interactions with diversity climate perceptions in predicting calculative attachment and found support for satisfaction with pay as a moderator, but not supervisor effectiveness. Finally, the study determined that the benefits of a positive diversity climate may extend to all employees, including White men. ©2011 Wiley Periodicals, Inc.