Michael Gove’s problem is that a single market is more than just a tariff-free zone

One of the key ideas in Michael Gove’s recent, much-publicised Brexit speech was that the UK could rely on membership of a European free trade zone. This idea constitutes a bizarre historical throwback to the early years of Britain’s relationship with what was then called the European Economic Community, or Common Market. But the relevance of his attempt to dismiss the economic case for continued EU membership in a 21st century context is highly questionable, writes Piers Ludlow.