[rhino369]

No it's because the fed actively manages money supply while Bitcoin managed money supply by setting money growth at a predetermined rate.

That and the vast majority of bitcoins are held for speculation instead of used as a currency.

[CyberDildonics]

Many other countries have currencies that fluctuate wildly even with their own central banks. Is the US just better at managing it? The Yen lost half of its value a few years ago.