This paper investigates the impact of foreign direct investment (FDI) on the productivity of Portuguese manufacturing sectors. It improves on previous studies by considering the choice of the most appropriate interval of the technological gap for spillovers diffusion. Sectoral variation in the coefficients of the spillover effect is also allowed for. Idiosyncratic factors are identified by means of a fixed effects panel model and positive inter-sectoral spillovers are also examined. Significant spillovers require a proper technological differential between foreign and domestic producers and favourable sectoral characteristics. They may occur in modern industries in which the foreign firms have a clear, but not too sharp, edge on the domestic ones. Agglomeration effects are also a pertinent specific influence. Ce texte examine les r�percussions des investissements directs �trangers (IDE) sur la productivit� des secteurs manufacturiers au Portugal. La sp�cification du mod�le est am�lior�e par le choix de l'intervalle le plus appropri� de l'�cart technologique pour la diffusion des spillovers. Nous tenons �galement compte des variations sectorielles dans les coefficients de spillovers; des facteurs sectoriels idiosyncrasiques sont identifi�s au moyen d'un mod�le � effets fixes. Les spillovers intersectoriels positifs sont examin�s. Des spillovers importants requi�rent un v�ritable �cart technologique entre producteurs �trangers et domestiques ainsi que des caract�ristiques sectorielles favorables. Ils peuvent se produire dans les industries modernes o� les entreprises �trang�res jouissent d'une sup�riorit� nette, mais pas trop marqu�e. Les effets d'agglom�ration exercent aussi une influence sp�cifique pertinente.
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