I did not find any of these answers to be fully explicative of the main point of the passage.
In answer choice E, the phrase "failed to account for" is used. When I first read this choice I didn't like it because I understood the phrase to be synonymous with failing to recognize the existence of. I thought this was wrong because the first sentence of the last paragraph talks about economists trying to bring increasing returns into the mainstream, so obviously there were economists that were aware of its existence.
If, however, I take "failed to account for" to mean "failed to explain" then the answer choice is much better as portrayed in the last two sentences of the passage.
Is my understanding that I should have taken "failed to account for" to mean "failed to explain" correct? I know I have seen this phrase on other practice LSATs, so if I see it again can I always take it to have this meaning?