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Economic historian Nick Crafts warns that if Britain leaves the EU to create stricter controls on migration, this will make it difficult to negotiate access to the European single market, which would be costly for the UK. This was recorded during a World Questions debate in London.

Image: A technician at Nissan’s Sunderland plant in England, the UK’s biggest single car producing site. The EU accounted for 57.5% of UK car exports in 2015.
Credit: Christopher Furlong/Getty Images