>> What do you say to Wyman's example of tomatoes?
That is a wrong question to ask. That paper claims tomato price will go up. This is based on WTO tariff and trade barrier without being in CU/SM.
However, in real life we don't isolate one item examine separately. It has to happen on all items flowing in and out of economy.
There will be lots of items where EU will face similar tariff when export goes out of UK. We know UK has trade deficits with EU.
To analyze what will be economic consequences of Brexit, one would need to consider all possible parameters and accurately predict the relationship among them. This would require supercomputers and even then possibly the outcome will be simply wrong.
Any attempt to cancel Brexit citing economic difficulty (the way Brexit negotiation going on) will be perceived as not doing it and thus won't be accepted by public. The remain supporters (govt/MPs) are still trying on this route. This will push people to further right and both labour and conservative might break up just to create Brexit and anti-Brexit parties.
I think rather than trying to stop Brexit, remainers have a better chance just to encourage clean breakup from EU and ask a new referendum 5-10 years later. If UK manages well outside EU then people will prefer that way and if not can rejoin back to EU.
Trying something might be easier than trying reasons for not doing it.
Now the question "why would EU allow us to join back later" is not relevant at current context. This is something again no one can predict.
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