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Not as I recall; the really big gains where in the post-WWII GI Bill era, which began the really big shift on the supply side. I think by sometime in the '70s or '80s a substantial degree of saturation was reached ... and of course the '80s is when the costs suddenly detached from the rest of the economy (of course, you should check this against a more reliable inflation metric than what the necessarily biased US government puts out).

One would also want to look at when the 4 year college bachelor's degree replaced a high school degree. Why Johnny Can't Read was published in 1955; not too many years/decades after that it was widely recognized that a high school degree no longer signaled much of anything.

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