This paper quantitatively assesses the interaction between permanent immigration into France and France's macroeconomic performance as seen through its GDP per capita and its unemployment rate. It takes advantage of a new database where immigration is measured by the flow of newly-issued long-term residence permits, categorized by both the nationality of the immigrant and the reason the permit was issued. Using a VAR model estimation of monthly data over the period 1994-2008, we find that immigration flow significantly responds to France's macroeconomic performance: positively to the country's GDP per capita and negatively to its unemployment rate. At the same time, we find that immigration itself increases France's GDP per capita, particul...