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, particularly in the case of family immigration. This family immigration also reduces the country's unemployment rate, especially when the families come from developing countries.