A simple Keynesian model of inflation and unemployment under rational expectations

Zusammenfassung Ein einfaches keynesianisches Modell der Inflation und der Arbeitslosigkeit bei rationalen Erwartungen. — Dieser Aufsatz entwickelt ein einfaches makro?konomisches Modell keynesianischer Struktur, in dem eine lang-same Anpassung der Nominall?hne das gleichzeitige Bestehen von Inflation und Arbeitslosigkeit zul?βt. Die Preise der Fertigwaren sind vollst?ndig flexibel, und die Erwartungen hinsichtlich der zukünftigen Preisbewegungen werden rational ge-bildet, so daβ sie alle Informationen über institutionelle Beschr?nkungen des Arbeits-marktes und über die w?hrungs- und fiskalpolitischen Regeln der Regierung ent-halten. Es wird gezeigt, daβ es trotz kurzfristiger Starrheit der L?hne m?glich ist, die Volkswirtschaft sofort bei Zielgr?βen für Inflation und Besch?ftigung zu stabili-sieren, wenn man die Maβnahmen so kombiniert, wie R. Mundell (1971) vorgeschla-gen hat, d.h. die Rate der monet?ren Expansion sollte sich nach der angestrebten Inflationsrate richten und die Fiskalpolitik dem Besch?ftigungsziel dienen.

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Résumé Un simple modèle Keynesien d’inflation et de ch?mage sous des expectatives rationelles. — Ce papier développe un simple modèle macroéconomique de la structure Keynesienne où l’ajustement lent des rémunérations nominales permet la coexistence de l’inflation et du ch?mage. Les prix des biens finaux sont complètement flexibles et les expectatives concernant les mouvements futurs des prix sont formées rationellement en manière qu’elles incorporent toutes les informations regardant les restrictions institutionelles sur le marché du travail aussi bien que les règles de la politique monétaire et fiscale du gouvernement. Nous démontrons que, malgré de la rigidité salariale à court terme il est possible de stabiliser immédiatement l’économie sur le niveau des buts d’inflation et de ch?mage supposé que la combinaison des politiques recommandée par R. Mundell ({dy1971}) soit pour-suivie, c’est-à-dire que le taux de l’expansión monétaire devrait être lié au but d’inflation et la politique fiscale au but de ch?mage.

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Resumen Un modelo keynesiano simple de inflación y desempleo bajo expec-tativas racionales. — En este artículo se desarrolla un modelo macroeconómico simple de una estrutura keynesiana, donde un ajuste lento de los salarios nominales permite la coexistencia de inflación y desempleo. Los precios de los bienes finales son completamente flexibles y las expectativas referentes a movimientos futuros de precios se forman racionalmente, de tal manera que ellas incorporan toda la información referente a limitaciones institucionales en el mercado del trabajo, como también las reglas gubernamentales de las políticas monetaria y fiscal. Se muestra, que a pesar de la rigidez de corto plazo de los salarios, es posible estabilizar instan-tàneamente la economia a niveles establecidos como metas para la inflación y el desempleo, siempre que se aplique la mezcla de politicas recomendada por R. Mundell (1971), p.ej.: la tasa de expansión monetaria debe ser ajustada a la tasa de inflación asignada como meta y la política fiscal a la tasa de desempleo asignada como meta.

     

Diversification strategy and systematic risk

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Youth engagement in agricultural policy processes in Malawi

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