Collusion in a Bertrand duopoly model with decreasing returns and product differentiation

We study cartel stability in a differentiated price-setting duopoly with returns to scale. We show that a cartel may be equally stable in the presence of lower differentiation, provided that the decreasing returns parameter is high. In addition we demonstrate that for a given factor of discount, there are technologies that can have decreasing returns to scale where the cartel always is stable independent of the differentiation degree.

The Stephen Dwoskin dossier: introduction

This dossier aims to consider the contribution Stephen Dwoskin and his work made to the development of film and its infrastructure in the UK from 1964 when he arrived in the London until his death in 2012. Dwoskin not only straddled different contexts and ideologies about film but advocated for the support of work in a wide variety of forms. Because of this he was not easily categorizeable. Much of the work analyzing his camera work and his contribution to film is written in French and there is little, particularly in recent years, in English. As such this dossier constituted an important contribution to the reassessment of a singular avant-garde artist and film maker. (can I use avant garde here?) In the light of his recent death this is a timely moment for a consideration of Dwoskin’s achievements and legacy. As well as having a groundbreaking vision of what film could do, he was an influential figure and constituting force in terms of the milieu and structures that supported the independent film world in the UK for several decades. Much of the literature surrounding this world in the UK has been formed by key figures making sense of their part in history. This dossier aims towards some first steps in historicising his legacy. Two of the proposed texts will be making use of new material to conduct original research made available through the recently acquired Dwoskin Archive at University of Reading. Due to Dowksin’s heterogenous involvement in film, there are many ways in which Dwoskin can be considered and the proposed essays will take a range of perspectives to assess and analyse his contribution.

Bertrand, Cournot and monopolistically competitive equilibria

Using an example, we study the analogs, for the differentiated product case, of the Cournot and Bertrand equilibria. These equilibria can be shown to exist and be uni que if we impose a sim pie and natural restriction on the elasticities of the demand functions for the differentiated products. Our characterizations of these equilibria make it possible to compare them and to determine how they are affected by the size of the market and the number of firms. We are also able to prove the existence of Cournot free-entry equilibria in which the number of firms is determined endogenously. In addition, we are able to prove that, in a large market, the Cournot free-entry equilibria approximate the Dixit-Stiglitz monopolistically competitive equilibria. The free-entry equilibrium concept we study is an analog of the one studied by Novshek for the case of firms selling products that are perfect substitutes. Our results are extensions of Novshek's. While we were unable to establish a general existence result for Bertrand free-entry equilibria, we were able to prove that, when these equilibria exist, they are unique and that in large markets they also approximate the Dixit-Stiglitz equilibria.

A educação destina a algumas crianças no Piauí (1730 1859)

L'histoire culturelle de l'éducation de l'enfant dans le Piauí, de l'année de 1730 à l'année de 1859, je mange écriture dans ce travail de thèse, est motivé dans l'analyse sócio-histórica de la forme scolaire à la lumière des théorisations des historiens Gui Vincent, Bernard Lahire et Daniel Thin, avec l'objectif de refléter concernant le passage d'instauration de la socialisation des enfants dans les écoles publiques, religieuses, particulières et domestiques. La recherche concernente à la thématique éducation de l'enfant dans leurs conceptions politiques et culturelles levou-em à définir, je mange objet d'étude, les manières d'instruire les enfants dans l'(s) école (s) et dans la (s) famille (s). La thèse du travail ici défendu est de que l'éducation destinée aux enfants dans le Piauí, dans la période de 1730 à 1859, était soumise aux acquisitions des habilités de lecture et d'écriture, principalement, analogue à leurs conceptions politiques et culturelles. La judicieuse recherche de corpus documentaire (licences, avertissements, troupeaux, lettres, correspondances, consultations, métiers, règlements, régiments, rapports, lois, dispositions, cartes scolaires, cartes d'inscriptions) pour l'écriture de la thèse il se procède nous quantités formulaires et digitales du Portugal, Brésil, Pará, Maranhão et Piauí. L'analyse de l'ensemble des sources nous a permis de comprendre que la socialisation scolaire de l'enfant dans le Piauí n'a pas maintenu le mêmes façons pendant cette longue période qui a été de 129 ans, malgré des récurrences, celui-là a acquis des formes et des sens divers qui variaient comme les circonstances politiques et culturelles, les exigences du commerce, les espaces et les sujets qui l'ont vécue intensément

Opção ou desconhecimento?: panorama da prática interpretativa ligada ao repertório vocal existente no Brasil de 1730 a 1850, sob o ponto de vista do registro fonográfico brasileiro realizado entre 1957 e 2005

Pós-graduação em Música - IA

Dinâmica populacional e atividade madeireira em uma vila da Amazônia: a vila de Moju (1730-1778)

O presente trabalho pretende se debruçar sobre as estratégias de ocupação/colonização da região de Moju no sentido de tentar compreender as práticas vivenciadas por diversos sujeitos no processo de colonização da Capitania do Pará. Neste cenário a atividade madeireira caminhou paripassu com o extrativismo, a agricultura e as demais atividades manufatureiras catalisando população e proporcionando a fixação de unidades populacionais principalmente as margens dos rios, principais vias de deslocamento de pessoas e mercadorias. Neste recorte da América Portuguesa foram se conformando unidades familiares representadas não somente por senhores de engenhos, como comumente se costuma pensar, mas, principalmente, por diversos pequenos lavradores - índios, mestiços, negros e brancos pobres – alavancando o processo de colonização do espaço.

Sonho e poesia em Gaspard de la Nuit, de Aloysius Bertrand

Considerado o criador do poema em prosa na literatura francesa, Aloysius Bertrand incorporou em seus textos diversos elementos da cultura popular da Idade Média, entre eles, o sonho e o pesadelo. Neste artigo pretende-se mostrar que, em certos poemas do Gaspard de la Nuit, o sonho funciona não só como um motivo literário, mas também como componente da construção textual.