The most striking thing about the Treasury’s forecast of the impact of Brexit is the relative modesty of its claim that by 2030, assuming a UK-EU trade deal akin to the one negotiated by Canada, ‘our GDP would be 6.2 per cent lower’ while ‘families would be £4,300 worse off’. Since those quotes come from the foreword signed by George Osborne, many voters will distrust the whole document — in which case they might prefer the even more modest ‘worst case’ of a 2.2 per cent GDP hit by 2030 predicted by non-partisan think-tank Open Europe alongside what it calls ‘a far more realistic’ range of possible outcomes ‘between a 0.8 per cent permanent loss to GDP… and a 0.6 per cent permanent gain’.
If we take a middle way through all these forecasts, the most likely outcome is a run of small annual falls in GDP, after a big jolt at the start.
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