In some cases, people use another country's currency in private transactions, but the local currency remains legal tender and continues to circulate. Which of these is one term for this unofficial change in currency used?

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Currency substitution occurs when residents of a country use a foreign currency alongside or instead of the domestic currency for transactions. This can happen for various reasons, including hyperinflation or lack of confidence in the local currency, but it doesn't necessarily mean the local currency stops circulating or becomes illegal.

In Some Cases, People Use Another Country's Currency in Private