Numbers speak loudly.
From Russ Robert's interview with Enrico Moretti:
Russ: The statistic you quote that in the 1950s the average worker at General Motors (GM) could make 7 cars in a year, and now they make 28--that's an unbelievable transformation.
Moretti: That's right. It means that for the same amount of cars sold, now GM needs 70% fewer workers.
