> If hookworm was the cause and hookworm was solved, why are the states still so poor? Imagine you have two runners who are running a marathon. The first runne

> If hookworm was the cause and hookworm was solved, why are the states still so poor? Imagine you have two runners who are running a marathon. The first runner has to carry a 50 lb backpack for the first 10 miles of the race. If you check their times for the midpoint of the race would you say carrying the backpack can't possibly be the reason the first runner is slower than the second? They aren't carrying it anymore (ie the problem is solved) so why didn't they catch up?