"John Stuart Mill's position as the unchallenged leader in economics and in other fields in his time was due not only to the quality of his own work but also to the happenstance that people of comparable stature did not come along at that time to contest his methods and conclusions. He was like a track star running against the clock instead of against another track star. He was never pushed — either by the criticism or the competing theories of comparably able contemporaries — to reach his utmost potential. In the long run, his reputation suffered accordingly, because in the long run there are always people of comparable stature."