1. 'In', means we have the right to live and work in EU member countries. 'Out', means we would lose that freedom.
In means everyone else has the right to come here, out certainly does not preclude the right to work in Europe.
2. 'In' means that with easy access to the EU market, foreign-owned companies, eg Japanese car manufacturers, are happy to locate here creating thousands of jobs. 'Out' means that these companies could move to lower cost EU countries with the loss of these jobs.
Read the latest reports major manufacturers would stay hers over fear of social stability in the rest of migrant troubled europe
3. 'In' means that UK exports are not subject to EU export tariffs. 'Out' means, not only would the UK be subject to such tariffs, but also that we would have to meet EU production standards.
Out means free trade with the world, rest if the world manages without been in the EU.
4. 'In' means that the UK is in there helping write the rules. 'Out' means that they would be written without us.