The strategic logic of cost leadership usually requires that a firm be the cost leader, not one of several firms vying for this position. Many firms have made serious strategic errors by failing to recognize this. When there is more than one aspiring cost leader, rivalry among them is usually fierce because every point of market share is viewed as crucial. Unless one firm can gain a cost lead and "persuade" others to abandon their strategies, the consequences for profitability (and long-run industry structure) can be disastrous, as has been the case in a number of petrochemical industries. Thus cost leadership is a strategy particularly dependent on preemption, unless major technological change allows a firm radically change its cost position.