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Inthis new work, Pascariu and Duarte, along with an international group ofacclaimed scholars, delve into key challenges currently facing the EuropeanUnion. They Analyze the effect ofperipherality across the EU regions which will be of great interest to thosecountries and regions facing a process of integration.

The EMU debt crisis that emerged in 2010 has identified a group of Southern countries, especially Greece, Portugal, Spain and Italy, as low performers exhibiting several seriousmacroeconomic imbalances, and it has also highlighted that EU integration experiencedby Eastern European countries (especially the latter-comers to EU) was not accompanied by a rapid process of real convergence. Since then, the researchabout the effects of peripherality have regained a renewed interest toultimately ground better regional policy recommendations aimed at achieving asustained reduction of income per capita disparities across EU regions. In this new work, Pascariu and Duarte, along with an international group ofacclaimed scholars, delve into key challenges currently facing the EuropeanUnion. They investigate this central question: does the domestic market systemlead to the development of a center-periphery model, by highlight gaps, or doesit support the convergence process? Analyzing the effects of peripheralityacross the EU regions, a two-fold approach is used to deliver policyrecommendations grounded in economic theory, and of interest to other countriesand regions facing a process of integration.

Notre étude du concept de taux naturel de chômage a comme objectif une réflexion sur le concept et sa possible utilisation comme indicateur de politique économique. Après la réflexion faite sur le concept (I), nous présentons les principaux modèles théoriques qui déterminent le taux (II). Au-delà des problèmes soulevés par l'estimation économétrique, nous proposons, pour l'économie portugaise, une étude fondée sur des séries trimestrielles (III). Finalement nous concluons (IV). ; This paper presents some of the conclusions reached by us in the framework of a broader research on the Natural Rate of Unemployment (NRU). Our main aim is to ascertain the NRH properties as an economic indicator, placing special emphasis on the Portuguese economy. First we review the concept of NRU. Secondly we compare the two most important types of NRU models: the Phillips model, updated by Gordon's "triangle" model (1997) and Layard, Nickell and Jackman's model (1991) updated by Blanchard's version (1999). The economic and social factors leading to the existence of a short or medium-run varying NRU (NAIRU) or to the non-existence of a long-run NRU (NAIRU) are emphasised. Thirdly, some of the major difficulties concerning the econometric analysis of the NRU are pointed out. Fourthly, with a non-linear version of Elmeskov method we obtain a very stable and predictable series of the NRU dependent on cyclical and trend output. The AIC criterion leads to a long memory model. A near-VECM model produces impulse responses that confirm our previous results of hysteresis in unemployment rate. Finally we conclude.