Answer:
The key element in the EU is free trade
Explanation:
The clear liberal columns that the EU stands in are shown in the promotion and interest they have in getting, mostly asian, investment to create employment in their countries; therefore they are constantly remarking the importance of commerce with low tarrifs and free trade, that's why the Brexit inicative is such a problematic and shocking move to it, it's the total opposite of what the EU was created for economically speaking