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No, they just slowly devalue it. Though not so slowly in the last couple of years.

Default is different, it's an inability to pay debts. They have no problem printing more dollars and paying debts.

[pascalxus]

i mean by having inflation run hot at 5-10% for many years or decades, they're defaulting on their obligation to provide a stable value currency for the people.

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There's no such obligation. USD purchasing power has been dropping pretty steadily.