Iodine deficiency drops IQ 15 points. There's about 2 billion people deficient in iodine. 30 billion IQ points just waiting to be unlocked with... salt.
GiveWell's analysis is interesting: https://www.givewell.org/international/technical/programs/salt-iodization … According to them the effect is smaller and the problem is more complex than that. But it agrees with your point that this is low-hanging fruit.
![∃𝑋[∅∈𝑋∧∀𝑦(𝑦∈𝑋⇒𝑦∪{𝑦}∈𝑋)]](https://pbs.twimg.com/profile_images/976278603989168129/5nzgS7j4_normal.jpg)
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Yes. Even if I'm off by an order of magnitude, fixing this issue would yield productivity gains that rival significantly more complex projects (e.g. AGI).
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Beyond iodine, you could also put a lot of other things into salt, that systems are otherwise poor at delivering to people. Can you put more generalized vitamins into salt? And there are very few companies that make most of the salt...
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