Key points are not available for this paper at this time.
David Card, Francis Kramarz, Thomas Lemieux, Changes in the Relative Structure of Wages and Employment: A Comparison of the United States, Canada, and France, The Canadian Journal of Economics / Revue canadienne d'Economique, Vol. 32, No. 4 (Aug., 1999), pp. 843-877
Card et al. (Sun,) studied this question.