In this article we revisit the classic comparison between Bertrand and Cournot competition in the presence of a cartel of firms that faces outsiders acting individually. This competition setting enables to deal with both non-cooperative and cooperative oligopoly games. We concentrate on industries consisting of symmetrically differentiated products where firms operate at a constant and identica...

Consider a Bertrand model in which each rm may be inactive with a known probability, so the number of active rms is uncertain. This activity level can be endogenized in any of several ways{ as whether to incur a xed cost of activity, as output choice, or as quality choice. Our model has a mixed-strategy equilibrium, in which industry pro ts are positive and decline with the number of rms, the s...

Since at least Engle (1982) and Stock and Watson (2002), we know that the conditional variance of future output and inflation evolves over time. However, in these seminal contributions, the risk of real activity and inflation is implicitly considered as symmetric. In this paper, we investigate the time evolution of the conditional distribution of macroeconomics variables with a special interest...

this study was carried out to investigate the important characteristics in some cultivars/genotypes of persianwalnut (juglans regia l.), black walnut (j. nigra l.), and walnut inter-specific hybrids: paradox (j. hindsii × j.regia) and royal (j. hindsii × j. nigra) in kamalshahr research station in karaj in 2011-2012. in the study,vegetative vigor was evaluated based on trunk cross-sectional are...

The Bertrand-Darboux integrability condition for a certain class of perturbed harmonic oscillators is studied from the viewpoint of the BirkhoffGustavson(BG)-normalization: In solving an inverse problem of the BGnormalization on computer algebra, it is shown that if the perturbed harmonic oscillators with a homogeneous cubic-polynomial potential and with a homogeneous quartic-polynomial potenti...

Achieving software reliability takes many complementary techniques, directed at the process or at the products. This survey summarizes some of the most fruitful ideas. Cite as follows: Bertrand Meyer, Dependable Software, to appear in Dependable Systems: Software, Computing, Networks, eds. Jürg Kohlas, Bertrand Meyer, André Schiper, Lecture Notes in Computer Science, Springer-Verlag, 2006.