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But many of those who argue for a leave vote on sovereignty grounds nevertheless still want Britain to have the best possible trading relationship with other EU states, which makes sense since most of our exports go to them. They say they would like Britain to stay in the European single market as far as possible. Both Norway and Switzerland are in the single market but not the EU, so there is precedent here. The problem is that the rest of the EU sees free movement of people as one of the fundamental pillars of the single market. In other words, the price of retaining access to the EU market is likely to be allowing free movement of people.