Martin Vander Weyer Martin Vander Weyer

Brexit forecasting is futile – and both sides should just admit it

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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