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There's absolutely no guarantee that those things will happen. Economic demise is probably 50/50
50/50 based on what? The economic profession does not share that view. As @dammit says, this will make us poorer, compared to not leaving. What isn't clear is how much
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Economic modelling at a macro scale is notoriously inaccurate.
There is no A:B test for any of this stuff. What we do not know is what would have happened anyway. We can look to other major European economies that are not exiting the EU: Germany and France both teetering on the edge of recession as indicators of more global issues.
50/50 is a sensible position to take.
There's absolutely no guarantee that those things will happen. Economic demise is probably 50/50