If the economy of a nation such as Greece is faltering, the value of its associated currency, the euro, is likely to decline in strength as well.
If the economy of Greece is faltering, it effects the value of its associated currency which is the Euro. Thus, the Euro declines when the Euro's value is lower compared to other currencies in the foreign exchange market.
A currency is considered strong if it is becoming more valuable relative to another country's currency. And, a currency is considered weak if it is becoming less valuable versus another country's currency.
Hence, the value of the euro, is likely to decline in strength as well.
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