John Merrifield and I write,

We criticize the way that Goldin and Katz talk about “years of schooling” as a continuous variable, when the underlying phenomenon is that the combination of high school graduation rates and college attendance rates increased more slowly after 1970 primarily because of a slowdown in the former, a slowdown which was arithmetically driven by the fact that high school graduation rates can only go up to 100 percent; We criticize the way they break up time periods in a way that buries the productivity acceleration of 1990-2005 . This acceleration is more consistent with the view that technology surged ahead than with the view that growth in skills fell off.

This is from the new issue of Econ Journal Watch.