How would the UK fare outside the EU? Nobody knows for sure. A divorce can be smooth, causing only modest damage. Or it can be messy, inflicting serious pain on everybody except the lawyers. It would all depend on the policy choices taken by both sides following a hypothetical vote for Brexit on 23 June 2016.

But history offers a stark lesson. From 1958 to 1972, the UK stayed outside the European Economic Community (EEC). As the EEC members traded more with each other upon opening their markets to each other, the UK lost market share fast. The ratio of German imports from the UK relative to its imports from fellow EEC members fell by more than half from 16% in 1958 to less than 8% in 1972. Trade diversion hurt the UK so badly that it began to ask to be let into the EEC five years after staying aloof in 1958.

Europe made the difference. After rejecting two UK applications to join in 1963 and 1967, the EEC finally opened its door to the UK in 1973. As a result, the UK’s share of the German import market rebounded strongly to 18% by 1980. Beyond the dismantling of trade barriers, a decline in the real effective exchange rate of sterling after 1971, UK austerity under the 1976 IMF programme and rising UK exports of North Sea oil also helped that trend.

It is the common market. In theory, the UK could stay in that market even upon leaving the broader EU. But that comes with three snags: (i) The bedrock of the common market is a set of common rules and regulations. They are imperfect. But they are the rules. (ii) Free trade in goods and services is tied to the free movement of capital and labour. (iii) Members must pay into the EU budget.

If it wanted to, the EU could offer the UK a satellite status: Free access to the common market if the UK continues to pay up, abides by all Brussels rules and regulations, lets the European Central Bank supervise the London market in euro products and treats any Polish plumber like a native worker. But whether the EU, whose top priority would be to avoid setting a precedent that could encourage other would-be leavers, would indeed offer such a sweet deal to a country that has just spurned it, is highly questionable. And that the UK, having just rejected the EU, would really accept a satellite status that would be worse than its current position looks unlikely.

The terms of divorce would be negotiated between an EU that represents 83% of joint GDP and a UK accounting for 17%. Have a guess who would dictate most of the terms. That would leave the UK a tough choice between accepting whatever Europe offers or going for a long and contested divorce battle. Of course, the UK would still trade with the EU even after a messy divorce. But its access would be restricted in those fields in which it does not fully abide by all EU regulations. The UK would be at a disadvantage, as it had been when it had remained outside the EEC 1958-1972. We know how that ended for the UK.

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