Likewise, in Italy, Ireland and Spain, the language matters less (less than 30%) in comparison with other OECD countries. Although these are very interesting finding, they should be interpreted with caution. Speaking the host-country' language at home may also capture other (observed and unobserved) characteristics of the household which have not been taken into account in this analysis. In the United States and Belgium, controlling for foreign qualifications accounts for 60% and 65% of the difference respectively, and close to 60% in France, Finland and Italy. In contrast, in the United Kingdom, only 30% of the initial difference between natives and migrants reflect differences which can be attributed to the country where education w,as completed. The analysis on foreign qualifications is likely to control both for differences in the quality of education across countries, but also language skills of those migrants who have studies in the host country.