Key Sectors: A New Proposal from Network Theory

García Muñiz A. S., Morillas Raya A. and Ramos Carvajal C. Key sectors: a new proposal from network theory, Regional Studies. There is a long tradition of studies in the input–output field for determining key sectors. Their analysis allows the identification of those sectors that affect the demand and supply system greatly, therefore constituting the basis for the growth and development of a territory. In order to pinpoint those sectors whose position is more relevant in the economy, a definition of centrality measures is proposed from network theory that is considered to be new in the input–output field. The definition is based on the consideration of three complementary characteristics: total effects, mediative effects and immediate effects. The term used for these measures is ‘multilevel indicators’ and these indicators have the enormous advantage of allowing different sized structures to be compared and the key sector concept to be approached from a relational and global viewpoint. García Muñiz A. S., Morillas Raya A. et Ramos Carvajal C. Secteurs clés: une nouvelle proposition de la théorie des réseaux, Regional Studies. Il existe une longue tradition d'études dans le domaine des entrées–sorties pour déterminer les secteurs-clés. Ces analyses permettent d'identifier les secteurs qui ont un fort impact sur le système de l'offre et de la demande et constituent donc la base de la croissance et du développement des territoires. Afin de localiser les secteurs dont la position concerne davantage l'économie, nous proposons, en nous appuyant sur la théorie des réseaux, une définition de mesures de la centralité que nous estimons être nouvelle dans le domaine des entrées-sorties. Cette définition repose sur l'examen de trois caractéristiques complémentaires: effets totaux, effets médiatiques et effet immédiat. Ces mesures, que nous appelons indicateurs multi-niveaux, présentent le très grand avantage de permettre la comparaison de structures de tailles différentes et d'aborder le concept de secteur-clé d'un point de vue relationnel et global. Théorie des réseaux Analyse des entrées–sorties Secteurs-clés García Muñiz A. S., Morillas Raya A. und Ramos Carvajal C. Schlüsselsektoren – ein neuer Vorschlag von der Netzwerktheorie, Regional Studies. Zur Ermittlung von Schlüsselsektoren gibt es eine lange Tradition an Studien im Bereich Input–Output. Diese Analysen ermöglichen die Identifizierung von Sektoren mit einer hohen Auswirkung auf das Angebots- und Nachfragesystem, weshalb sie die Grundlage für das Wachstum und die Entwicklung eines Gebiets darstellen. Um die Sektoren herauszuarbeiten, deren Position in der Wirtschaft relevanter ist, schlagen wir von der Netzwerktheorie ausgehend eine Definition von Messgrößen für Zentralität vor, die wir im Bereich Input–Output für neu erachten. Die Definition beruht auf der Berücksichtigung von drei einander ergänzenden Merkmalen: Gesamteffekte, mediative Effekte und unmittelbare Effekte. Diese Messgrößen, die wir mehrschichtige Indikatoren nennen, bieten den enormen Vorteil, dass sie es ermöglichen, Strukturen verschiedener Größe zu vergleichen und das Konzept der Schlüsselsektoren aus einer relationalen und globalen Perspektive zu behandeln. Netzwerktheorie Input–Output-Analyse Schlüsselsektoren García Muñiz A. S., Morillas Raya A. y Ramos Carvajal C. Sectores clave: una nueva propuesta a partir de la teoría de redes, Regional Studies. La determinación de los denominados sectores clave ha suscitado una larga tradición en el análisis input–output. Su análisis permite identificar aquellas ramas que poseen un alto efecto multiplicador en la demanda y la oferta del sistema y que, por tanto, suponen los pilares del crecimiento y desarrollo de una región o nación. Para detectar aquellos sectores con una posición más relevante dentro de la economía proponemos a partir de la Teoría de Redes la definición de medidas de centralidad que consideramos nuevas en el ámbito input–output. Su definición está basada en la consideración de tres características complementarias: efectos totales, efectos inmediatos y efectos de intermediación. Estas medidas, que denominaremos de forma genérica indicadores multinivel, poseen la ventaja de permitir la comparación entre estructuras de distinto tamaño y ofrecer una aproximación desde un punto de vista relacional y global al concepto de sector clave. Teoría de redes Análisis input–output Sectores clave

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