It's not just our contribution which matters. The EU provides a market for our products. The single market/customs union means that, for example, car production in Sunderland is possible. Parts are shipped across borders with no delay, then the finished cars are exported, again with no delay at the border. Nissan has already decided to relocate some of its business to Japan, but it makes sense for them to relocate the European production to Spain (or elsewhere within the EU). Not only will jobs be lost at Nissan itself, but thousands of others in the supply chain and in the outlets where Nissan workers spend their money. That money isn't calculated in the contribution/rebate. Not only that, but some areas of the UK receive massive amounts of EU funding and I wouldn't hold my breath that the UK government will make up any shortfall.