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If you allow free movement of people between countries that have vastly different standards of pay and welfare then the people of the poorer countries will migrate to the richer countries and depress the salaries in that country until such time as there is parity across Europe.
This will be suffered hardest by the low-skilled, low-paid of the richer countries - our working class.
The ultimate effect is a rise in inequality as a result of EU migration which is unable to do anything to fix it because it's a technocracy and is resolutely committed to the 4 freedoms, one of which is hugely detremental.
How long before the remainers experience their remorse at, trying and failing to, maintain the tyrannical status quo of inequality and EU technocracy?