How much different would the current potential framework in the economic agreement that might be forthcoming be vs. how the UK & the EU existed immediately before the vote? Is it substantially worse for the UK, marginally worse, better at all?
Both the UK and the EU will be losers, in my own conservative estimate the UK about ten times more than the EU overall , some Eu countries will not be affected at all while some of the closer ones will be more affected like, Ireland (the most) ,France, Germany, Netherlands. However, the barriers and obstacles put up by the UK leaving the EU affect the UK's relationship with 27 other countries plus all the countries the EU have relationships with.
Whereas each EU country's relationship is only affected with their relationship with one country, the UK.
There are so many problems but the immediate significant problem will be the different customs arrangements. For example, a company in the UK sell something to a company in Denmark. They may put it on a truck, deliver it to Denmark with an invoice and a packing list.
From 1st January the documentation required will be significantly higher, the bureaucracy will increase, the goods may be subject to tariffs, phytosanitary inspection, forms to confirm the goods comply to EU standards, the goods themselves would have to be certified by the EU, the tariffs and taxes will have to be registered and paid, the truck may be delayed significantly by customs inspections.
Costs will increase, bureaucracy will increase, there will be inevitable delays.
Remember I am only touching very lightly in the significance of what will change.
There is just so much.
Brexit may have worked if the UK was a tiny self-sufficient island with no contact with the outside world.
Personally I cannot see any benefit whatsoever, only downsides and those who voted Brexit cannot seem to show a benefit either beyond ridiculous clichés they've been brainwashed into repeating parrot fashion by the right-wing media.