's 2014. = a = oo = .=) mo — =] 3 cr = o iw = = = cy — a = to £ = a — a = é ic) a co = = g cz a = c i = a = — Harvard professors Claudia Goldin and Lawrence Katz argue that, rather than technology picking up speed, the reduced supply of educated workers is the key factor explaining the education gap, finding t

. But I think he misses the major engine of innovation: the market tends to find whatever is profitable, even if we cannot see what that is today. Lawrence Katz, an economist at Harvard, wrote to me that the Gordon essay "is a wise and thoughtful piece but a very, very speculative one. The historical eviden