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Largely nothing to do with the EU. Countries are left to their own devices. I suppose this is because of the large range of cost of living across the EU. I think some countries have minimum wages by sector and others (nordic?) have formed their own minimum wage alliance.
However, the EU is gradually working towards these principles being adopted across the board, eventually being ratified into a social rights treaty.
Minimum wage - anything to do with the EU? I can't find anything which says that it is.