The belief that increased competition leads to greater efficiency and higher productivity is one of the articles of faith for admission to the economic priesthood.

Economic practitioners often know little about the peculiarities of particular markets – about their specific areas of market failure – and often don't think they need to know because what they do know about is their profession's two magic answers to inefficiency.

The first is to "get the incentives right" (the claimed rationale for much tax reform) and the second is to increase competitive pressure.

There's a lot of truth to both propositions, but not as much as it suits economists to believe. Because it comes from their model of markets, many economists' belief that the more competition the better – and the more choice the better – is so deeply ingrained it requires no empirical confirmation.