If tutors really do reliably produce two-sigma learning gains, then why aren't most top achievers the product of tutors? Yes, they're expensive, but perhaps "only" 2-3x private school; there are a lot of wealthy parents. Diminishing returns for high achievers?
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I agree that this would add to the figure. I'm curious: do you have sources on the specific numbers?
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I did some very lightweight research a few years ago using various lists that rank most impactful people in specific fields, decades. centuries, etc. — IIRC it was ~70% of the few hundred folks I looked through. At some point I want to fund proper research into this.
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