Abstract This paper offers a concise critical overview of Okun's Law, with particular attention for its relevance in open economic systems of regions. Based on an extensive set of economic data for Finnish regions, the existence of cointegration is tested using alternative statistical methods, viz. the residual-based test and the conditional error correction model. A novelty of the paper is to combine a method of hidden cointegrations with a method of removing cross-sectional dependence. After correcting for hidden cointegrations and cross-sectional dependence, both statistical methods used yield almost similar results and confirm the presence of cointegration for the relevant data on Finnish regions. The long-run Okun relationship for regions in Finland appears to confirm results found elsewhere in the literature on countries as a whole, although the coefficients tend to be smaller. RÉSUMÉ Cette communication présente un aperçu critique concis de la loi d'Okun, et se penche tout particulièrement sur sa pertinence éventuelle pour les systèmes économiques ouverts dans les régions. Sur la base d'un ensemble de données économiques approfondies concernant les régions finnoises, on procède à des essais de l'existence d'une co-intégration, en appliquant des méthodes statistiques alternatives, à savoir les essais à base résiduelle et le modèle de correction des erreurs conditionnelles. Une nouveauté contenue dans cette communication est la combinaison d'une méthode de co-intégrations cachées avec une méthode d’élimination de la dépendance transversale. Après des corrections tenant compte des co-intégrations cachées et de la dépendance transversale, les deux méthodes statistiques utilisées produisent des résultats similaires, et confirment la présence d'une co-intégration pour les données relatives aux régions finnoises. Les rapports de longue durée de la loi d'Okun appliquée aux régions de la Finlande semblent confirmer les résultats relevés ailleurs dans la documentation générale sur les pays, même si les coefficients ont tendance à être plus petits. EXTRACTO Este estudio ofrece una perspectiva general concisa y crítica de la ley de Okun, prestando particular atención a su relevancia en sistemas económicos abiertos regionales. En base a un conjunto amplio de datos económicos sobre regiones finlandesas, se pone a prueba la existencia de cointegración utilizando métodos estadísticos alternativos, tales como, el ensayo basado en residuales y el modelo condicional de corrección de errores. Una de las novedades del estudio es que combina un método de cointegraciones ocultas con un método de eliminación de dependencia cruzada. Después de hacer correcciones para las cointegraciones ocultas y la dependencia cruzada, ambos métodos estadísticos producen resultados casi similares y confirman la presencia de cointegración en los datos oportunos sobre regiones finlandesas. La relación Okun a largo plazo de regiones en Finlandia parece confirmar los resultados encontrados en otras partes de la bibliografía sobre países enteros, aunque los coeficientes tienden a ser menores.
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