The authors deal with the best way to tackle the problem of mutations that affect Saharan spaces (environmental, economics) and their consequences on different scales. The final objective of this paper is to propose theoretical and more operational elements about the observation of those...

The behavioral tradition has largely anchored on Simon's early conception of bounded rationality, it is important to engage more explicitly cognitive approaches particularly ones that might link to the issue of identifying novel competitive positions. The purpose of the study is to describe the...

The food crisis in Southern Africa that stems from the crop failures of the 2001-2002 crop season has, not surprisingly, prompted much reflection on the causes of the problem and policy responses. Several official donors and NGOs have set in motion reviews, including, for example the EU and CARE...

We show that a simple mixing idea allows to establish a number of explicit formulas for ruin probabilities and related quantities in collective risk models with dependence among claim sizes and among claim inter-occurrence times. Examples include compound Poisson risk models with completely...

The aim of this paper is twofold: first, we want to explore the intra-firm diffusion of information and communication technologies (ICT) within the Tunisian firms and to characterize its general trends of adoption and usage. Second, we want to emphasize the rank and epidemic effects stressed by...

Thanks to its empirical success, the gravity approach is widely used to explain trade patterns between countries. In this article we question the simple application of this approach to product/sector-level trade on two grounds. First, we demonstrate that the traditional Armington version of...

Tree methods are among the most popular numerical methods to price financial derivatives. Mathematically speaking, they are easy to understand and do not require severe implementation skills to obtain algorithms to price financial derivatives. Tree methods basically consist in approximating the...

Si les relations de care émergent généralement de manière spontanée dans le contexte domestique (Noddings, 1984), certains auteurs plaident pour la reconnaissance de leur rôle en dehors de la sphère privée (Tronto, 2009), notamment dans le contexte de la prise en charge des personnes en...

A limit order book provides information on available limit order prices and their volumes. Based on these quantities, we give an empirical result on the relationship between the bid-ask liquidity balance and trade sign and we show that liquidity balance on best bid/best ask is quite informative...

L'envolée actuelle des prix des matières premières agricoles a des répercussions fortes sur les filières. A titre d'exemple, la cotation beurre, qui atteint aujourd'hui 4150€/tonne, a augmenté de près de 70% en un an. Cette augmentation du prix des produits industriels laitiers,...