True, but... other countries around the world are producing the very same things, even cheaper, but they are taxed in the EU. China has no major deal with the EU for this reason. UK leaving would open to that possibility that Switzerland decided to open in 2010, balancing what comes in and what goes out and both countries got a major boost in respective goods. Swiss got access to the manufacturing in China for Swiss high tech companies and China got access to the major luxury good produced here, plus bank services, med techs and collaborations with universities like ETHZ.