It’s not worth spending more on American workers at current wage levels

From Facts about non-residential investment by Tyler Cowen

Digesting some cited data, Cowler observes

One simple hypothesis is that it’s not worth spending more on American workers at current wage levels. As workers, while Americans are quite good, they are just not that much better than a variety of high-IQ individuals in cheaper countries, many of whom now have acceptable infrastructure to work with.

Accepting the premise on a contingent basis, I wonder if then the conclusion might be that the fastest improvement might be in helping individuals improve their non-cognitive skills and behaviors. Probably would materially improve the inequality trends as well.