The Dual Stickiness Model and Inflation Dynamics in Spain

We estimate a model that integrates sticky prices and sticky information using Spanish data following Dupor et. al (2008). The model yields three empircal facts: a-) the frequency of price changes (around one year), b-) the firm's report that sticky information is no too important for nominal rigidities and c-) the inflation's persistence, the latter with more microfoundations than the Hybrid Model. We found that both types of stickiness are present in Spain, but the most important is the stickiness in prices.Sticky Prices; Sticky Information; Spain; Inflation Dynamics

Exact and approximate results of non-extensive quantum statistics

We develop an analytical technique to derive explicit forms of thermodynamical quantities within the asymptotic approach to non-extensive quantum distribution functions. Using it, we find an expression for the number of particles in a boson system which we compare with other approximate scheme (i.e. factorization approach), and with the recently obtained exact result. To do this, we investigate the predictions on Bose-Einstein condensation and the blackbody radiation. We find that both approximation techniques give results similar to (up to ${\cal O}(q-1)$) the exact ones, making them a useful tool for computations. Because of the simplicity of the factorization approach formulae, it appears that this is the easiest way to handle with physical systems which might exhibit slight deviations from extensivity.Comment: 15 pages, prl revtex style, 4 ps figures. New -shortened- version accepted for publication in Eur. Phys. J.