gwern comments on Rationality Quotes September 2011 - Less Wrong
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"Economic gains resulting from the reduction in children's exposure to lead in the United States", Grosse et al 2002 (fulltext)
Their summary estimate from pg5/567 is a lower-middle-upperbound of each IQ point is worth, in net present value 2000 dollars: 12,700-14,500-17,200.
(Note that these figures, as usual, are net estimates of the value to an individual: so they are including zero-sum games and positional benefits. They aren't giving estimates of the positive externalities or marginal benefits.)