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One position is:
The costs of the goods being bought/sold would change with the UK leaving the common market, and it is very much likely that a number of these things would become more cost-effective to manufacture on the continent, rather than import from here.
There have been a lot of arguments that the UK would sign up to the EEA, but look into what Switzerland and Norway need to do to be part of it..
This 57% trade thing- is it suggested that a huge chunk of our trade would not be with Europe without the EU?