In particular, I’d appreciate more examples of prediction systems making the world more predictable.

There is a possibly apocryphal anecdote about how, prior to the publication of the Black-Scholes model, option prices approximately reflected theory. After the publication of the model, option prices precisely reflected theory because everyone was using the model to price options!

I have never been able to find a source for this story but it should be easy enough to verify through historical options data.

EDIT: I apparently failed to read as far as the first comment: https://www.lesswrong.com/posts/6bSjRezJDxR2omHKE/real-life-examples-of-prediction-systems-interfering-with?commentId=2kKZ87cQxmMviyJmc

There is a possibly apocryphal anecdote about how, prior to the publication of the Black-Scholes model, option prices approximately reflected theory. After the publication of the model, option prices

preciselyreflected theory because everyone was using the model to price options!I have never been able to find a source for this story but it should be easy enough to verify through historical options data.

EDIT: I apparently failed to read as far as the first comment: https://www.lesswrong.com/posts/6bSjRezJDxR2omHKE/real-life-examples-of-prediction-systems-interfering-with?commentId=2kKZ87cQxmMviyJmc