Yes, PITi + ui is supposed to be the real importance and tractability. If we knew PITi + ui, then we would know a cause area’s marginal impact exactly. But instead we only know PITi.
Yes, PITi + ui is supposed to be the real importance and tractability. If we knew PITi + ui, then we would know a cause area’s marginal impact exactly. But instead we only know PITi.