It depends. When the currency is issued by a 3rd party (Eurozone by ECB), it works like a normal debt like any other business. The ability to repay the debt is determined by its ability to levy taxes, so the orthodoxy is that the currency issuer can pressure the government to raise taxes and reduce spending in order to keep the debt under control.
When the currency is issued by the government, it works more like a currency control which limits the amount of currency in circulation in order to keep the value of the currency in a certain range. When the government cannot pay its debt in its own currency (Argentina), what happens is that the investors sell its debt to recover some of the losses, and sell the currency because investing in that country in general becomes risky. Importing goods start to be difficult because people don’t buy the currency of the country to do business of that country.
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