Competition between firms is usually the most effective way of delivering economic efficiency and what consumers want. However, there is a balance to be struck. Firms must not be over-regulated and so hampered in their development of innovative products and new strategies to compete for customers. Nor must they be completely free to satisfy a natural preference for monopoly, which would give them higher profits and a quieter life. The economic role of competition policy (control of anticompetitive agreements, mergers and abusive practices) is to maintain this balance, and an effective policy...