the euro’s slide

An article in the Economist magazine in 2010 observed: “The euro’s slide implies that the [euro] zone’s members will be relying on foreign demand, not their own, to restore their fortunes.”
a. What does the article mean by “the euro’s slide”?
b. What is the connection between the euro’s slide and the reliance of countries that use the euro on foreign demand to help their economies?

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