Using a population-wide Danish Matched Employer-Employee panel from 1980-2006, we document a strong trend towards more positive assortative wage sorting. The correlation between worker and firm fixed effects estimated from a log wage regression increases from -0.07 in 1981 to .14 in 2001. The...

We document a strong trend towards more positive assortative wage sorting using Danish Matched Employer–Employee data from 1980 to 2006. The pattern is not due to compositional changes in the labor market and primarily occurs among high wage workers.