How much competition is enough? Many important markets are dominated by a few large companies. The big four accountancy firms undertake the audits of almost all large corporations. Most current accounts are held at a small number of retail banks. You have a choice of perhaps three or four mobile phone networks. The list of similar oligopolies can easily be extended.
有多少竞争就足够了？许多重要市场都是由少数几家大企业所主宰的。四大会计师事务所承担了几乎所有大企业的审计工作。大多数往来账户开立在少数几个零售银行中。你可能可以在三、四个手机网络中做出选择。类似的寡头垄断案例不胜枚举。
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