In theory, productivity gains on automobiles leads to cheaper cars and increased car sales. So an increase in workers is possible. But I agree that looks like

In theory, productivity gains on automobiles leads to cheaper cars and increased car sales. So an increase in workers is possible. But I agree that looks like a questionable assumption. If the productivity improvement changes car prices from $250K to $25K, sure the assumption will work out. But not sure $25K to $24K would work out.