Wie wirken „Subkulturen der Gewalt“? Das Zusammenspiel von Internalisierung und Verbreitung gewaltlegitimierender Normen in der Erklärung von JugendgewaltHow do “Subcultures of Violence” lead to violence? The interplay of internalization and prevalence of norms legitimizing violence in the explanation of youth violence

Both the internalization and the prevalence of violence-legitimizing norms are empirically related to acts of violence. The action-theoretic processes, though, that generate these relationships are not well understood. Based on subcultural approaches to violence formulated in social psychology, ethnology and sociology the current study identifies two action-theoretic processes that relate violence-legitimizing norms to acts of violence: conforming to internalized norms in applicable situations on the one hand; and status considerations on the other hand. The model of frame selection is applied to integrate these processes into a general theory of action. Hypotheses are tested using data from a school-based survey in Germany (N?=?2635). Multi-level regression models on measures of violent intentions in a factorial survey, as well as on response times to this factorial survey, are reported. The results confirm the expected interplay of internalization of violence-legitimizing norms, prevalence of these norms, and situational provocation in explaining violent intentions and the time respondents needed to answer the factorial survey.     

A parsimonious multivariate poisson model for market basket analysis

Intensified research on multivariate Poisson models offers new opportunities for the analysis of purchase quantities in market basket data. The investigation of positive or negative correlations in quantity decisions among product categories facilitates a deeper understanding of consumer purchase behavior. The applied multivariate log-normal Poisson model introduces interdependencies between categories with multivariate normal-distributed latent effects by means of a covariance matrix. As the size of this covariance matrix depends on the number of categories in the model, its ation may become tedious. Furthermore, we assume that quantity decisions do not interact for all pairs of categories. That is why we propose to use covariance selection to derive a parsimonious representation of the correlation structure. For two market basket data sets, we show that the vast majority of off-diagonal elements in the covariance matrix are irrelevant. For a data set with product categories, the model with a partly restricted covariance matrix achieves a better fit to the holdout data than the model with full covariance matrix. For a data set with subcategories of the broader category beverage, the proposed model with restricted covariance outperforms the model with full covariance matrix even on the calibration data. We conclude that interactions of quantity decisions are overall the exception, even for complements-in-use.     

How to ensure that headquarters add value

Over the last few years many international corporations have started to restructure their organizations fundamentally by redistributing management tasks and creating small, market-oriented units. However strong the centrifugal forces were, the core task in restructuring these corporations was: how to redesign the corporate centre. The design of the corporate centre is of major importance for the performance of corporations. Corporate Centres can actively improve the performance of their business units, for instance by defining performance targets or by providing shared resources. On the other hand headquarters are frequently accused of being bureaucratic liabilities which make no contribution to corporate success. This problem has grown in recent years as organic growth, internationalization, and an increasing number of mergers and acquisitions have generated new co-ordination problems. These developments have given new priority to the question of corporate centre organization. What is required is the definition of an effective role for the centre and the establishment of central units with efficient scope and size. This article discusses both tasks in the light of current and future requirements for corporate centre organization.     

The word ‘variable’ in logic,mathematics and economics

The paper deals with the meaning of the word variable as used by various authors in various disciplines. In the first part of his article the author explains the synonyms used for this word such as indefinite numbers, mappings or concepts. He further discusses the meaning of variables and unknowns as applied in modern logic and traditional mathematics. In economic models the variable is inseparably linked to the economic quantity by which it is characterized and interpreted. Distinctions are made between endogenous and exogenous variables and between a variable and its time path.The author is indebted to Tor Fernholm for valuable comments on a preliminary draft.     

Reconocimiento de emociones a partir de la expresión y el contexto: Una réplica

Resumen

En el presente estudio se examinan las contribuciones relativas de la expresión facial y el contexto situacional al reconocimiento de emociones. Tras la evaluación independiente de ambas fuentes de información, los sujetos juzgaron distintas combinaciones que variaban en su grado de congruencia. Aunque los resultados indican una preponderancia de la información expresiva sobre la situational en el juicio global, se señala la necesidad de nuevos diseños que permitan investigar el papel modulador del contexto sobre los juicios emocionales.     

THE ROLE OF TRANSACTION COSTS FOR FINANCIAL VOLATILITY: EVIDENCE FROM THE PARIS BOURSE

This paper analyzes the causal linkage between transaction costs and financial volatility under two methodological improvements over the existing literature. First, we use panel data in which exogenous transaction cost differences in the French stock market are induced by price level dependent minimum price variation rules (tick size rules). Unlike in previous studies based on one‐time regulatory tick size changes (like the U.S. decimalization), we can separately identify and control for marketwide volatility changes. Second, we avoid the pitfalls of biased volatility measurement across regimes by using the range as a tick size robust volatility metric. Panel regressions controlling for marketwide volatility effects show at high levels of statistical significance that the hourly range volatility of individual stocks increases by more than 30% for a 20% exogenous increase in transaction costs due to tick size variations in the French trading system. In the light of this evidence, higher transaction costs in general, and security transaction taxes in particular, should be considered as volatility increasing. (JEL: F3, G1, G14)     

Hierarchie und Entlohnung

In this paper, we suggest a wage scheme that accounts for the hierarchical structure of an enterprise. We employ concepts of cooperative game theory and modify the van den Brink (2008) approach. Besides results on how the hierarchy affects wage differentials between levels of the hierarchy, we deal with the allocation of employees to the different levels.     

Populations with constant immigration

We consider a Leslie‐type model of a one‐sex (female) population of natives with constant immigration. The fertility and mortality schedule of the natives may be below or above replacement level. Immigrants retain their fertility and mortality, their children adopt the fertility and mortality of the natives. It is shown how this model may be written in a homogeneous form (without additive term) with a Leslie‐type matrix. Reproductive values of individuals in each age group are discussed in terms of a left eigenvector of this matrix. The homogeneous form of our projection model permits the transformation into a Markov chain with transient and recurrent states. The Markov chain is the basis for the definition of genealogies, which incorporate immigration. It is shown that genealogies describe the life histories of individuals in a population with immigration. We calculate absorption times of the Markov chain and relate them to genealogies. This extends the theory originally designed for closed populations to populations with immigratioa     

The Implementation and Maintenance of a Behavioral Safety Process in a Petroleum Refinery

A values-centered and team-based behavioral safety process was implemented in a petroleum oil refinery. Employee teams defined the refinery's safety values and related practices, which were used to guide the process design and implementation. The process included (a) a safety assessment; (b) the clarification of safety-related values and related practices; (c) process design and executive overview; (d) safety-observation training; (e) feedback, recognition, and celebration; and (f) process maintenance. Data that span 20 years are presented to show the long-term impact on recordable incidents, lost-time cases, and direct costs of injuries. The implementation was associated with an 81% decrease in recordable incidents, a 79% decrease in lost-time cases, and a 97% savings in annual workers' compensation costs over an eight-year period. An interview with the vice president of the refinery is presented to highlight the process's influence on the refinery's safety culture.