Search results for " Uncertainty"

«I molteplici casi della sorte». Disastri della guerra e della natura in Tucidide

2018

Il capitolo 23 del primo libro di Tucidide conclude il proemio e ricapitola gli elementi chiave della visione storiografica dello storico ateniese. Sopo aver connesso il primato della guerra alla sua durata e ad un impressionante elenco di sofferenze (pathemata) Tucidide aggiunge un secondo elenco di disastri naturali (terremoti, eclissi, la peste). Questo contributo si propone di indagare il rapporto tra le due serie di disastri nel quadro della più ampia visione tucididea sulla guerra e sulla condotta umana. Accostando ai pathemata l’elenco dei disastri naturali, lungi dal volere individuare nella straordinaria sovversione dell’ambiente naturale un effetto delle decisioni umane o un annun…

FROM UNBURDENING TO LIBERATED EMBODIED SIMULATION A HISTORY OF CONCEPTS

2020

What is imagination? How to think this «act» (action)? How to describe its phenomenology? And, above all, how to situate its very space in human behavior and mind? Can we outline a topic of imagination? I suggest that an ap- propriate blend between the tradition of philosophical anthropology, from Johann Gottfried Herder to Hans Blumenberg, and the new neuroscientific interpretation of «embodied simulation», could help us to refine our concept of imagination. I quote Herder just to refer to a noble forerunner of this genealogy, being the focus of my paper on a more controversial figure, namely Arnold Gehlen, author of an inspiring work of twentieth-century anthropology, Man. His Nature and …

Practical Financial Optimization: A Library of GAMS Models

2010

In Practical Financial Optimization: A Library of GAMS Models, the authors provide a diverse set of models for portfolio optimization, based on the General Algebraic Modelling System. 'GAMS' consists of a language which allows a high-level, algebraic representation of mathematical models and a set of solvers --- numerical algorithms --- to solve them. The system was developed in response to the need for powerful and flexible front-end tools to manage large, real-life models. The work begins with an overview of the structure of the GAMS language, and discusses issues relating to the management of data in GAMS models. The authors provide models for mean-variance portfolio optimization which a…

Responsibility in uncertain times: an institutional perspective on precaution

2008

Precaution is a key issue in environmental governance. Variously defined, intensively debated and introduced in many regulations, its meaning, scope and application remain problematic. This article argues that the controversy on precaution is a matter of culturally patterned expectations concerning the production and use of knowledge and the related social positions and responsibilities. The way uncertainty and its role in the policy process are understood is crucial. For some precaution is a flawed concept, to be accommodated to the current expert-based cooperative scheme. For others it is a major innovation requiring a rearrangement of the latter. Precautionary policies may evolve in dif…

A value for multichoice games

2000

Abstract A multichoice game is a generalization of a cooperative TU game in which each player has several activity levels. We study the solution for these games proposed by Van Den Nouweland et al. (1995) [Van Den Nouweland, A., Potters, J., Tijs, S., Zarzuelo, J.M., 1995. Cores and related solution concepts for multi-choice games. ZOR-Mathematical Methods of Operations Research 41, 289–311]. We show that this solution applied to the discrete cost sharing model coincides with the Aumann-Shapley method proposed by Moulin (1995) [Moulin, H., 1995. On additive methods to share joint costs. The Japanese Economic Review 46, 303–332]. Also, we show that the Aumann-Shapley value for continuum game…

Duopoly experimentation: Cournot competition

1999

Abstract This paper analyzes learning behavior in an industry facing uncertainty. We consider a duopoly game where firms have imperfect information about market demand and they learn through observing market prices. The main body of our study consists of showing how firms make the price a more informative signal through their experimental behavior, and how this behavior compares to its monopoly counterpart. We extend previous analysis to the case where the demand unknown parameter takes values on the real line. We also find that experimentation under Cournot duopoly is smaller than under monopoly whenever the demand's unknown parameter is sufficiently precise.

Existence of competitive equilibrium in a non-optimal one-sector economy without conditions on the distorted marginal product of capital

2012

Abstract This paper develops a method for proving the existence of competitive equilibrium in a distorted/non-optimal one-sector economy–a discrete time variant of the Romer model–without conditions on the equilibrium value of the marginal product of capital. Existence is obtained under weaker conditions than in Le Van et al. (2002) . Moreover, we provide an existence result for an economy with a regressive tax studied in Santos (2002) . The proofs rely on ideas of Becker and Boyd (1997) .

Eurocity London: a qualitative comparison of graduate migration from Germany, Italy and Latvia

2016

This paper compares the motivations and characteristics of the recent migration to London of young-adult graduates from Germany, Italy and Latvia. Conceptually the paper links three domains: the theory of core–periphery structures within Europe; the notion of London as both a global city and a ‘Eurocity’; and the trope of ‘crisis’. The dataset analysed consists of 95 in-depth biographical interviews and the paper’s main objective is to tease out the narrative similarities and differences between the three groups interviewed. Each of the three nationalities represents a different geo-economic positioning within Europe. German graduates move from one economically prosperous country to another…

Author response to the contributors to the discussion on “A critical evaluation of the current ‘p -value controversy’”

2017

Discussion of "modern statistics of spatial point processes"

2007

The paper ‘Modern statistics for spatial point processes' by Jesper Møller and Rasmus P. Waagepetersen is based on a special invited lecture given by the authors at the 21st Nordic Conference on Mathematical Statistics, held at Rebild, Denmark, in June 2006. At the conference, Antti Penttinen and Eva B. Vedel Jensen were invited to discuss the paper. We here present the comments from the two invited discussants and from a number of other scholars, as well as the authors' responses to these comments. Below Figure 1, Figure 2, etc., refer to figures in the paper under discussion, while Figure A, Figure B, etc., refer to figures in the current discussion. All numbered sections and formulas ref…