JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.Abstract. The recent trend in macro-economic literature has been to explain cycles in aggregate output and employment in terms of unexpected nominal shocks only. In these models the natural rate of unemployment is constant. This paper diverges from this approach and, following a recent paper by David Lilien (1982), considers the impact of real as well as nominal variables. The main findings are (1) a significant part of the fluctuations in the Canadian unemployment over the 1957-83 period was caused by real shocks to the economy, and (2) most of the transmission of the business cycle from the United States to Canada is effected through real variables as well. Une etude de limpact de deplacements sectoriels sur le niveau de ch6mage agrege au Canada. Dans la litterature macroeconomique recente, on a eu tendance a expliquer les cycles dans le niveau de la production et de l'emploi A peu pres strictement en termes de chocs nominaux non-anticipes. Dans ces modeles, le taux de ch6mage naturel est constant. Ce memoire prend des distances par rapport a cette approche et suit pluto.t la direction suggeree par un memoire recent de David Lilien qui considere l'impact des variables reelles tout autant que celui des variables nominales. Les resultats principaux sont: (1) une portion significative des fluctuations dans le niveau du chomage canadien entre 1957 et 1983 a et causee par des chocs reels subis par l'economie; (2) le gros de h1 transmission du cycle economique des Etats-Unis vers le Canada se fait par le truchement des variables reelles.

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