Regarding the first point, Caplan personally estimates that about 80% of education is signalling and that 30% is the lowest figure one can plausibly maintain.
As for the second point, I wouldn't bet my life on it. But I think the case is strong enough that experimental measures in that direction are warranted.
As for the second point, I wouldn't bet my life on it. But I think the case is strong enough that experimental measures in that direction are warranted.