Local Sunspot Equilibria Reconsidered

We generalize the usual notion of local sunspot equilibria. We say such equilibria exist around a steady state of an OLG economy whenever stationary sunspot equilibria of arbitrarily close economies exist within any neighborhood of the steady state. Unlike the usual notion, this generalization allows to address the following identification problem: Can an analyst distinguish empirically small fluctuations due to small shocks to the fundamentals from pure expectations-driven fluctuations? We study conditions under which these generalized local sunspot equilibria exist in OLG economies, and show that they may exist around not only indeterminate but also determinate steady states.     

Praxis urbaine: Notes on urban struggles in Italy

Cet article critique le point de vue avancé par certains groupes italiens, selon lequel la lutte urbaine se produirait dans un cadre distinct de celui des conflits au travail et possèderait un potentiel politique plus grand que ces derniers. La lutte urbaine a été au centre de la croissance du mouvement ouvrier dans l'Italie de l'après-guerre. L'article remonte ensuite aux racines historiques de ce phénomène et trouve une signification toute particulière dans la pérriode de la résistance anti-fasciste et dans la toute récente période historique. Cet exposé est illustré par une documentation d'actualité et par la discussion d'un grand éventail de cas de lutte urbaine. On y avance que le mouvement ouvrier (c'est à dire les partis officiels et les syndicats), ont donné à la lutte urbaine une perspective historique et une ampleur nationale, la transformant en un véritable mouvement et faisant d'elle le moteur de réformes.     

Maynard Keynes: An Economist's Biography

D. E. Moggridge's perhaps too exhaustive biography is examined and some questions are raised relative to Keynes'views on theory and their source, and his views on German reparations and whether Britain should have accepted the original provisions of the agreement providing for establishment of the World Bank and the International Monetary Fund.     

Spatial co-localisation of firms and entrepreneurial dynamics

In this conceptual paper, I propose an interpretation of business dynamics in terms of the spatial co-localisation of firms—considered as an intelligent cognitive system—in a circumscribed area in order to form clusters of various types. I interpret clustering by adopting the methodology of multi-agent combinatory systems: that is, systems formed by collectivities of agents (firms) in which an internal feedback recombines the micro behaviours of the agents (localisation) in order to produce a macro effect (cluster) which, in turn, modifies the attractiveness of the area and conditions the subsequent localisations. I also present the idea that if a cluster has fitness advantages for new firms, then usually new entrepreneurs are formed within it and the cluster widens, due to the endogenous genesis of new firms.     

Endogenous fluctuations,markups, capacity and credit constraints

In the present paper endogenous fluctuations have been generated by referring to endogenous markups, variable capacity utilization, and credit constraints. As one can detect, they are the same ingredients as those used to generate the so called selffulfilling cycles. With respect to this strand of literature, three changes are introduced. First of all, credit constraints are conceived within the Minsky’s financial instability hypothesis. Secondly, markups may have different dynamic patterns and impacts. Finally, heterogeneous agents are assumed to form evolutionary expectations. The results of these interacting aggregate demand and supply aspects are endogenous fluctuations obtained by means of simulations. Robust limit cycles and interesting comovements between variables are achieved in this medium-run model.     

The sector bias of skill-biased technical change and the rising skill premium in transition economies

We test the hypothesis that the sector bias of skill biased technical change is important in explaining the rising relative wage of skilled workers in the manufacturing sector in three Central and Eastern European transition countries. The econometric results broadly confirm that the concentration of skill biased technical change in the skill intensive sectors had a significant effect on the skill premium in these transition countries.

Uncertainty and Learning in Stochastic Macro Models

Limits on information have deep economic impact and affect the conduct of economic policy. In the present paper we explore the effect of substantive uncertainty in a macro model, from both an analytical and methodological point of view. Agents are boundedly rational and make their forecasts according to different techniques and try to learn the values of the various parameters. In this context, a Markov regime switching rule, a VAR system, and recursive least square are considered and compared. As a result, we obtain a model which is mostly keynesian in nature that can be compared with the new neoclassical synthesis models. Simulations are carried out and show the possible appearence of endogenous and persistent fluctuations.     

Effects of selected emulsifiers,enzymes and a carbohydrate-based fat substitute on physical and sensory characteristics in a low-fat muffin

Abstract Selected emulsifiers, enzymes and a carbohydrate-based fat substitute were incorporated into a standard muffin recipe, and their effects were compared with a full-fat counterpart. The control muffin had a significantly (P<0·01) more yellow crumb, was less firm (P<0·01) and contained less moisture (P<0·01). Sodium stearoyl-2-lactylate (SSL) and diacetyl tartaric acid methyl esters (DATEM) contributed to a less firm crumb (P<0·01) and helped to maintain moisture (P<0·01) in the fat-reduced muffin. Sensory analysis yielded complementary results to the physical data with respect to crumb firmness and crust colour. However, the full-fat muffin was significantly (P<0·01) moister. The emulsifiers along with the enzymes were found to be responsible for reducing crumb size (P<0·01).     

The Structure of Sunspot Equilibria: The Role of Multiplicity

This paper examines the structure of sunspot equilibria in a standard two period exchange economy with real assets. We show that for a generic choice of utility functions and endowments, there exists an open set of real asset structures whose payoffs are independent of sunspots such that the economy with this asset structure has a regular sunspot equilibrium. An important implication of our result is that the multiplicity of non-sunspot equilibria is not necessary for the existence of sunspot equilibria. Our technique is general and can be applied to show the existence of sunspot equilibria in other frameworks.