Final answer:
Executives have strong people management skills but lack the knowledge and intellect to outperform the competition.
Step-by-step explanation:
The fact that one-third of Fortune 500 CEOs have remained in their positions for fewer than three years indicates that executives have strong people management skills but lack the knowledge and intellect to outperform the competition. This is because they are unable to sustain their positions and achieve long-term success in their roles. While they may excel in managing people and building teams, they may struggle with strategic decision-making and outperforming their competitors.