Young highly educated workers developed in the 70's and 80's a preference for working in larger cities. As a consequence highly educated young workers in 1990 were over-represented in cities, in spite of the lower wage premium they earned for working in crowded metropolitan areas if compared to...

In the three decades from 1910 to 1940, the fraction of U.S. youths enrolled in public and private secondary schools increased from 18 to 71 percent and the fraction graduating soared from 9 to 51 percent. At the same time, state compulsory education and child labor legislation became more...