His chosen date is 2030. By then, the UK economy is expected to have grown by around 37 per cent, but the
HM Treasury document claims that this would be closer to about 29 per cent growth after Brexit.
.....
If you assume that
disposable income grows in line with GDP then he’d be arguing that there would be a £5,400 rise outside the EU by 2030 instead of £6,880 inside the EU – so the ‘cost’ of spurning EU membership would be £1,480 (per household). Which could be alleviated with a modest tax cut.