An Alternative Theoretical Explanation and Empirical Insights into Overordering Behavior in Supply Chains*

The beer game and the supply line underweighting theory are central to our knowledge of decision making in dynamic environments such as supply chains. The core of these theories is that people are incapable of recognizing the pipeline inventory and this is the main cause of overordering and dysfunctional behavior. This article identifies lacunae in the theoretical and empirical foundations of extant literature and proposes an alternate explanation, a “correction model,” explaining why overreactions occur. We adopt a multi‐method research design, comprising a field case study and laboratory experiments, to ground our findings. [Submitted: July 19, 2010. Revisions received: December 8, 2010; March 14, 2011. Accepted: March 28, 2011.]     

Occupational Stress, Mental Health and Satisfaction in the Canadian Multicultural Workplace

Workplaces are becoming increasingly multicultural and therefore, include a large variety of employees from more than one ethnicity, nationality, religious and/or cultural background. In the context of this new global economy, Canadian workplace structure and composition has also permanently changed. Consequently, the primary purpose of this project was to explore occupational stress, mental health and satisfaction (life, job, relationship) as experienced by immigrant individuals attempting to achieve integration into Canadian workplaces. In order to address this research aim, responses of Canadian born participants (N?=?42) were compared to those of non-Canadian born participants (N?=?42) with respect to a series of questionnaires addressing the variables of interest. Our results suggested that, with the exception of self-reported symptoms of somatization and paranoia, non-Canadian born workers in the fields of education, healthcare and/or social work report more similarities than differences when compared to the responses of Canadian born workers. In general, the findings of this study suggested positive outcomes for non-Canadian born professionals who immigrate into Canada under the economic category.     

I Am Woman,Hear Me Tweet! Gender Differences in Twitter Use among Congressional Candidates

This study synthesizes two theoretical literatures to explain gender differences in Twitter usage and effectiveness among US Congressional candidates. The first suggests that candidates in perceived disadvantaged positions, females in this case, innovate to improve their chances of success, and the second, that female politicians often adopt stereotypically masculine behaviors to be successful. On the basis of these theories, we hypothesize and confirm that female candidates are more likely than males to integrate Twitter into their campaigns, but our results are less conclusive regarding a difference in the likelihood that females use negative campaigning tactics via Twitter. Our results also indicate that those females who use Twitter more than their male counterparts tended to do better electorally, but this difference is conditional. Female Republican candidates who tweeted more increased their vote share, but the opposite is true for Democrats. We speculate that this differential effect may be a product of different audiences for social media in each party’s electorate.     

SCOR model application in developing countries: challenges & requirements

Due to the changes in the nature of business and competition from company versus company to supply chain versus supply chain, the importance of improving the entire supply chain holistically is becoming an increasingly important topic in recent studies. Industry practitioners and academics are focusing on developing a modelling tool for this purpose. However, such efforts were unsuccessful. The main reasons for failure are that the existing models are developed and tested based on the experiences of manufacturing firms in the developed world. The nature of the existing firms, their operating and business processes situation in developing countries vary greatly from the manufacturing processes and the surrounding environment in developed countries. However, the absence of an agreed upon, common language and standardised modelling tools for the entire supply chains hampers the global supply chain improvement initiatives. This paper focuses on addressing the issue of a how standardised and widely accepted model, like the SCOR, can be applied despite the different circumstances. The firms’ supply chain characteristics and new requirement for the model adaptation were collected based on the available literature and field analysis results. The research paper results focus on the make and delivery processes for illustration and evaluation.     

Birnbaum–Saunders sample selection model

The sample selection bias problem occurs when the outcome of interest is only observed according to some selection rule, where there is a dependence structure between the outcome and the selection rule. In a pioneering work, J. Heckman proposed a sample selection model based on a bivariate normal distribution for dealing with this problem. Due to the non-robustness of the normal distribution, many alternatives have been introduced in the literature by assuming extensions of the normal distribution like the Student-t and skew-normal models. One common limitation of the existent sample selection models is that they require a transformation of the outcome of interest, which is common R+-valued, such as income and wage. With this, data are analyzed on a non-original scale which complicates the interpretation of the parameters. In this paper, we propose a sample selection model based on the bivariate Birnbaum–Saunders distribution, which has the same number of parameters that the classical Heckman model. Further, our associated outcome equation is R+-valued. We discuss estimation by maximum likelihood and present some Monte Carlo simulation studies. An empirical application to the ambulatory expenditures data from the 2001 Medical Expenditure Panel Survey is presented.     

Industrial Relations and Trade Union Effects on Innovation in Germany

ABSTRACT: This paper provides a thoretical and empirical evaluation of unions’effects on innovative activity, focussing on institutional details and country-specific factors. We represent results of an econometric investigation for Germany using data at the industry and establishment level. In contrast to US studies, no statistically significant negative influence of unions on innovative activity shows up from industry-level data. Establishment-level data, however, indicate that the presence of a works council is positive for R & D if union density is not “too high”. This is in line with the more cooperative nature of industrial relations in Germany.     

The impact of attitudes and behavioral costs on environmental behavior: A natural experiment on household waste recycling

Numerous studies have shown the importance of incentives as well as of attitudes in explaining pro-environmental behavior. Reported attitude effects, however, are generally rather small and exhibit considerable variation among studies. Different theoretical perspectives can account for this finding: whereas theories of rational action suggest additive effects of costs and attitudes, the low-cost hypothesis and dual-process theories imply interaction effects - in different directions, resulting from different mechanisms. The present study tries to overcome the shortcomings of past research by using advanced statistical methods to test competitive hypotheses in the context of post-consumer waste recycling. We utilize data from a natural experiment on recycling participation in Cologne/Germany (n = 1882) in which the incentive structure for recycling changed due to the conversion of the recycling scheme from a drop-off system to curbside collection. In order to avoid self-selection bias, we conducted pre- and post-treatment surveys and applied conditional fixed-effects regression models. We found that curbside collection had a strong impact on recycling participation and attitudes had a moderate effect. The interaction is negative but statistically insignificant. Our findings contradict the low-cost hypothesis and provide some evidence that environmental concerns moderate the effect of the recycling scheme. We cannot, however, reject the rational choice proposition of mere additive effects.