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					Originally Posted by jonbxx  He was commenting on a proposal from the government. If we went down the road of the 'Max Fac' deal proposed, that's what it would cost. Of course the final deal may give different results but you can certainly model potential scenarios to get some ideas of relative costs.
 Not modelling outcomes of proposals as we don't know 100% what will happen is a very 'zen' way of doing things but not a way to run a country. It is right for the HMRC, the countries experts in revenue and customs of course, to run models and feed these back to the politicians to aid decision making. Otherwise, we're just guessing...
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 Yes, I agree that we have to cost the different scenarios, but these costs are based on assumptions that we will not find a way around the problems. They are based on worst case scenarios, but people seem to take these figures as indisputable facts as to how much a proposal will cost.
Where Brexit is concerned, all these people can focus on are costs when Brexit protagonists are convinced that there will be economic gains. A more balanced approach indicating the net financial implications, based on a reasonable interpretation of what is likely to happen, would be a better approach to take, because that would tell the real story.
Most forecasts I have seen concentrate on worst case scenarios which assume failed negotiations and no benefits of Brexit.