Freakonomics has posted Bill James’s answers to reader questions. He even answered my question.
Q: Is sabermetrics the Freakonomic analysis of baseball?
A: There are parallels. What I do was heavily influenced by the University of Chicago economists of the 1960’s. I think Freakonomics comes from the same tradition.
Cool, so we can trace the origins of sabermetrics to the Chicago school of economics.