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To flip it around, yes, the USD has lost 30% of its buying power in a month before.

To Bitcoin.

When you define the USD as stability, then yes, USD is stable. It seems like circular logic.

It only makes sense to talk about "buying power" when you can actually exchange a thing for goods and services which are priced in that thing. That doesn't apply to bitcoin, but it does to the dollar. This isn't arbitrary.

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