When nations enter into currency unions, their fiscal affairs continue to be separate. The exception to this situation is whenever a confederation of states has a system:

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When nations enter into currency unions, they usually retain separate fiscal policies. However, if the confederation of states has mechanisms in place that allow for interstate transfers, such as a common fund, it can help to equalize the distribution of resources among member states. This helps to maintain the stability of the currency union and ensures that all member states benefit from being a part of it.

When Nations Enter into Currency Unions, Their Fiscal Affairs Continue