This Working Ppaer confirms that labor productivity in the European economies has continued to slow down in recent years. U.S. productivity growth has been higher than in the EU, but only since 2001. At the same time, both economies have modified previous employment performance: EU employment growth is now higher than in U.S. This article proposes that productivity growth be explained by demand dynamics, and investment in particular, not forgetting the influence of employment, along with other factors such as new technologies.