Monopolistic competition,as you like it

We explore monopolistic competition with asymmetric preferences over a variety of goods provided by heterogeneous firms, and compute equilibria (approximating Cournot and Bertrand equilibria when market shares are negligible) through average Morishima elasticities of substitution. Further results concerning pricing and entry emerge under homotheticity and when demands depend on a common aggregator, as with Generalized Additively Separable preferences. Under additivity we can determine which goods are going to be provided under free entry, as well as the selection effects associated with changes in market size, consumers' income, aggregate productivity, and preference parameters.     

A Scale of Risk

This article proposes a conceptual framework for ranking the relative gravity of diverse risks. This framework identifies the moral considerations that should inform the evaluation and comparison of diverse risks. A common definition of risk includes two dimensions: the probability of occurrence and the associated consequences of a set of hazardous scenarios. This article first expands this definition to include a third dimension: the source of a risk. The source of a risk refers to the agents involved in the creation or maintenance of a risk and captures a central moral concern about risks. Then, a scale of risk is proposed to categorize risks along a multidimensional ranking, based on a comparative evaluation of the consequences, probability, and source of a given risk. A risk is ranked higher on the scale the larger the consequences, the greater the probability, and the more morally culpable the source. The information from the proposed comparative evaluation of risks can inform the selection of priorities for risk mitigation.     

Valori e norme di fronte alla complessità

Riassunto

Scopo del presente contributo è quello di evidenziare alcune connessioni concettuali fra il mondo normativo ed il moderno approccio della complessità.

A partire dal 1972, psicologi, etologi, antropologi culturali hanno sottolineato l'importanza dei codici sociali—oggettivati in diritti e doveri—in quanto parte integrante della interazione sociale. In particolare Calegari e Massimini (1979) hanno sostenuto che Le Costituzioni possono essere analizzate quali organizzazioni gerarchiche di sistemi complessi. Gli autori hanno indicato—nell'ambito di sistemi normativi—delle gerarchie di comprensione e di connessione riferite a centri di controllo di comportamenti registrati nelle Leggi fondamentali. Essi hanno sviluppato un metodo di analisi basato sulla identificazione di unità molari e di loro relazioni ed hanno messo a punto una serie di indici utili a misurare le dimensoni di complessità di tali sistemi.

Sulla base di un sucessivo approfondimento, l'autore ha centrato la sua attenzione sulle decisioni adattive incluse nelle Costituzioni. La conseguente analisi cognitiva mostra che le strategie normative si configurano in livelli (metapiani, piani globali, sottopiani, istruzioni comportamentali) in accordo con la ipotesi sistémica generale formulata da Bruner, Goodnow ed Austin (1966). La organizzazione gerarchica di questo tipo di strategia è caratterizzata dalla valenza e dalla covalenza di piani globali e di sottopiani, dal grado di similarità dei metapiani e dei piani globali, dal grado di ridondanza emergente ai differenti livelli gerarchici.

Le decisioni adattive sono presenti in numero limitato e ciò conferma le stipulazioni formulate dagli antropologi culturali. L'autore sottolinea che la presenza di ridondanza negli elementi di un sistema complesso rende possibile la sua descrizione in modo più coerente e completo.     

The origins of the Gini index: extracts from Variabilità e Mutabilità (1912) by Corrado Gini

The scope of this paper is to celebrate the 100th anniversary of the Gini index by providing the original formulae. Corrado Gini introduced his index for the first time in a 1912 book published in Italian under the name of ??Variabilità e Mutabilità?? (Variability and Mutability). This article provides selected extracts of Part I of the book dedicated to measures of variability. We find that Gini proposed no less than 13 formulations of his index, none of which is known today to the large public. We also find that Gini anticipated some of the developments that derived from the study of his index.     

Guilt in Marketing Research: An Elicitation–Consumption Perspective and Research Agenda

Guilt regulates many consumption processes and, consequently, marketers frequently use appeals based on guilt to influence consumers' behaviour. Owing to the multidisciplinary interest in this emotion, however, the literature is diverse and fragmented. The effectiveness of guilt appeals is contested, and some authors suggest that the use of this emotion in marketing might be unethical. Furthermore, research to date has not explored the potential relationships between the experience of guilt in consumption and the elicitation of this emotion through marketing appeals. This paper analyses existing research on guilt in marketing, developing four specific contributions based on the evidence reviewed. First, it shows under what circumstances feelings of guilt support consumer self‐regulation processes. Second, it outlines evidence‐based managerial recommendations on how to produce effective guilt appeals and avoid the potentially unethical consequences of marketing through this emotion. Third, it identifies a gap in existing theorizing and presents an elicitation–consumption perspective of guilt in marketing as a framework that complements current approaches to this research topic. Fourth, it develops an agenda for future research and suggests eleven research hypotheses for the advancement of this field. Through the analysis of research produced within different disciplinary perspectives, this study develops a necessary foundation for future work on the role of guilt in marketing processes.     

A fuzzy logic approach to poverty analysis based on the Gini and Bonferroni inequality indices

In the poverty analysis framework, a great deal of attention has been paid to the poverty measurement in terms of monetary variables, such as income or consumption. In this context, a relevant open problem is connected with the distinction between poor and non-poor. In fact, the concept of poverty is rather vague and cannot be defined in a clear way. In this respect, following a fuzzy logic approach, some new poverty measures are proposed. In particular, the fuzzy extension of two existing poverty measures based on the Gini and Bonferroni inequality indices is provided. Some synthetic and real applications are given in order to show how the proposed poverty measures work.     

Simultaneous confidence intervals on partial means of classes in the two-stage stratified sampling

Let’s consider a finite population of P units, each of them assumes a specific amount of the quantitative variable X. Moreover we assume that the range of values of X is subdivided into k classes and the sampling data come out from a two stage stratified sampling. The main purpose of the work is to determine the estimators, as well as their asymptotic distribution, of the partial means of classes, each of them is defined as a non linear function of the other parameters. Particularly, we are interested in determining the linear approximation estimators and, under convergence theorems, the asymptotic distribution. Afterwards we define the estimator of the vector of the partial means of classes and its asymptotic convergence to multivariate normal distribution is determined. These results are useful to develop simultaneous inferential procedures.     

The Use of Risk Assessment to Decide the Control Strategy for Bluetongue in Italian Ruminant Populations

The affiliation, assessment and management of risks is a traditional part of veterinary medicine. In the past, veterinary services involved in this type of activity usually assessed risks qualitatively. However, since the 1990s, quantitative methods have become increasingly important. The establishment of the World Trade Organization in 1994, and the promulgation of its Agreement on the Application of Sanitary and Phytosanitary Measures (the "SPS Agreement") led to an increased application of import risk analysis and to significant improvements in the methodology of risk analysis as applied to international trade policy for animals and animal products. However, there was very little development of risk analysis in veterinary fields other than international trade and management of health risks to consumers of animal products and little has been published on its use in the choice and definition of control or prophylaxis strategies for animal diseases. This article describes a quantitative risk assessment, which was undertaken in Italy to help choose an appropriate national response strategy following an incursion of bluetongue, an infectious disease of sheep and goats. The results obtained in this study support the use of risk analysis as a tool to assist in choosing an appropriate animal disease management strategy. The use of risk analysis in the evaluation of disease management strategies also offers advantages in international trade. It makes easier the comparison of different strategies applied in the various countries, and thus facilitates the assessment of equivalence of the guarantees provided by different strategies.