MEMBERSHIP of the euro is meant to be for keeps. Europe’s currency union is supposed to be immune from the sort of speculative attack that cracked the exchange-rate mechanism, the system of currency pegs that preceded it, in 1992-93. A lesson from that time is that when the foreign-exchange markets are far keener on one currency than another, even the stoutest official defence of a peg between the two can be broken. Inside the euro zone, no one can be forced to devalue because no one has a currency to mark down.
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