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how can anyone rationally think it is likely to get better outside the EU...
If you are a British born chef, carpenter, builder, plumber, driver, electrician, landscaper, decorator, glazier, warehouse operative, mechanic etc and would appreciate better pay and conditions I can see a certain (protectionist) logic.
Supply has been met by EU migrant workers. An unimaginative pragmatist (or a conservative) might say that market forces have been reliable whilst recent government has (rightly or wrongly) done very little.
tl:dr Altering the supply of labour for better pay and conditions is a thing.
Exactly. If it could be better but the EU provides a floor beneath which the UK isn't allowed to drop, how can anyone rationally think it is likely to get better outside the EU when that minimum requirement is lost?