"One of the key tenets of the new baseball thinking, which I will refer to as "sabermetrics" for the sake of ease, is that teams should try to find market inefficiencies and exploit them to gain an advantage over their opponents. But this concept has not yet trickled down to the managerial ranks in any significant way. I contend that there are significant advantages to be had by MLB teams by having their managers act more "sabermetrically". And I am quite curious as to why general managers have not pushed their managers in this direction. I would argue that they should."
Required reading for fans and managers alike.