The EU’s democracy works by having representatives from each country voted in to take a seat at the European Parliament. These representatives are called Members of the European Parliament (MEPs). The system is analogous to the way British democracy already works (ignoring the fact that countries tend to vote in radical-right political parties as MEPs, even relative to the Government they vote in for domestic government). The UK currently has a disproportionate say the running of the EU, through this democracy.
The UK’s biggest economic sector, fittingly, is economics: banking and financial services. The EU commissioner that deals with that is Jonathan Hill, a British man. The EU banking rules are ultimately resided over by a Brit, giving a Brit international say over regulations that control Britain’s biggest economic sector. I’m not saying Mr Hill has a dictatorial say over this, as there is still a democratic process that can be blocked by an elected Parliament if deemed necessary; but I am saying the UK will lose this sway if it leaves the EU.
This matters, because the UK will have to surrender its say in European Union politics if it leaves. At the moment, the UK has sway over vast areas in terms of policy. To maintain the current fruits of European trade, the UK will have to agree to become a follower of European politics while losing that democratic say. Else, it will have to trade at a disadvantage.
My job has always relied on the EU. I have been a teacher in international schools and a teacher as well as manager of international Summer Camps. The visa-free travel of EU member states has been important to my not only my job, but the entire industry to which I belong. The effect of creating visa restrictions is that it limits the numbers of students who come or that can even stay. This has been the effect in changes to visa rules for Russia and China and it is damaging the industry. But it’s not just language and international school jobs that the EU creates: manufacturing jobs rely on an observance of EU standards and regulations; travel relies on a lot of people actually travelling (which will be harder with visa restrictions in place); UK exports only compete in the European market because the trade agreement stops UK exports from having import tax applied (so British goods can undercut American ones).