If z has order q* and n is of the form n =m+q, then either k= m(q*+q+ l), or k= (m+q)(q*-q+ 1). Obviously, in case m=O, K is a maximal arc. Moreover, if m = 1 and q is a prime power, then K is either a Baer subplane or a unital [lo]. Furthermore, m pairwise disjoint Baer subplanes of n always yield a set of type (m, m + q) and size m(q* + q + 1). In case rc is Desarguesian, such a set does exis...

This paper computes welfare-maximizing monetary and fiscal policy rules in a real business cycle model augmented with sticky prices, a demand for money, taxation, and stochastic government consumption. We consider simple feedback rules whereby the nominal interest rate is set as a function of output and inflation, and taxes are set as a function of total government liabilities. We implement a s...

While several studies have shown that the performance on numerosity comparison tasks is related to individual differences in math abilities, others failed find such a link. These inconsistencies could be due variations which was assessed, different stimulus generation protocols for task, or inhibitory control. This within-subject study conceptual rep...

<p>Cet article présente une approche des caractéristiques générales pratiques de transformation la pensée élèves en vue construire connaissances compatibles avec celles sciences physiques et naturelles. À l'aide d'exemples tâches choisies dans le cadre recherche sur l’apprentissage l’optique géométrique, on a tenté d'identifier les naïve d'enfants 11 ans, puis, base d'une intervention did...

The evolution of in‡ation and output over the last 50 years is examined through the lens of a micro-founded model that allows for changes in the behavior of the Federal Reserve and in the volatility of structural shocks. Agents are aware of the possibility of regime changes and their beliefs have an impact on the law of motion underlying the macroeconomy. The results support the view that there...

The evolution of the U.S. economy over the last 55 years is examined through the lens of a micro-founded model that allows for changes in the behavior of the Federal Reserve and in the volatility of structural shocks. Agents are aware of the possibility of regime changes and their beliefs matter for the law of motion underlying the macroeconomy. Monetary policy is identified by repeated fluctua...

We develop an unobserved components approach to study surveys of forecasts containing multiple forecast horizons. Under the assumption that forecasters optimally update their beliefs about past, current and future state variables as new information arrives, we use our model to extract information on the degree of predictability of the state variable and the importance of measurement errors in t...