+A **common currency** is a single monetary unit adopted by multiple states or regions. It aims to streamline [Trade](/wiki/trade) and foster closer [Economic Union](/wiki/economic_union) by eliminating exchange rate fluctuations. Such a system can enhance price transparency and cross-border investment.
+## See also
+- [Currency](/wiki/currency)
+- [Monetary Policy](/wiki/monetary_policy)
+- [Euro](/wiki/euro)
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