© Standard & Poor'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 educat