These methods support Lewis’s argument that the valuation of different skills was inefficient in the early part of this period, and that this was profitably exploited by managers with the ability to generate and interpret statistical knowledge. This knowledge became increasingly dispersed across baseball teams during this period. Consistent with Lewis’s story and economic reasoning, the spread of this knowledge is associated with the market correcting the original mis-pricing.
I wonder if Billy Beane regrets cooperating in the writing of Moneyball. The idea was sure to spread, but the it might have spread more slowly.