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.
有多少競爭就足夠了？許多重要市場都是由少數幾家大企業所主宰的。四大會計師事務所承擔了幾乎所有大企業的審計工作。大多數往來賬戶開立在少數幾個零售銀行中。你可能可以在三、四個手機網路中做出選擇。類似的寡頭壟斷案例不勝枚舉。
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