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Central banks are definitely not the best way to handle things. However since, as mentioned above, the effects of interest rates -- and actually the whole of economics -- have not been fully understood yet, I doubt we'll come up with a better replacement for central banks any time soon. Even if cryptocurrencies are part of the solution, they are only one piece of the puzzle.
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But you are posting on a website that is dedicated to the one asset that is a suitable alternative to central banking!
You should really get your pre-order in for this upcoming book by Saifedean Ammous:
https://www.amazon.com/Bitcoin-Standard-Decentralized-Alternative-Central/dp/1119473861Bitcoin is the digital age’s novel, decentralized, and automated solution to the problem of money: accessible worldwide,
controlled by nobody. Can this young upstart money challenge the global monetary order? Economist Saifedean Ammous
traces the history of the technologies of money to seashells, limestones, cattle, salt, beads, metals, and government debt,
explaining what gave these technologies their monetary role, what makes for sound money, and the benefits of a sound
monetary regime to economic growth, innovation, culture, trade, individual freedom, and international peace.
The monetary and historical analysis sets the stage for understanding the mechanics of the operation of Bitcoin,
the reasons for its initial success, and the role it could play in an information economy. Rather than serving
as a currency and network for consumer purchases, the author argues Bitcoin is better suited as a store
of value and network for settlement between large financial institutions. With an automated and perfectly
predictable monetary policy, and the ability to perform final settlement of large sums across the world in a matter
of minutes, Bitcoin’s true importance may just lie in providing a decentralized, neutral, free-market alternative to national central banks.
This process will most likely take another 1-2 decades, but it is inevitable in my opinion. A system without a central authority that
enables certain actors to siphon off a huge chunk of the productivity increase is simply superior to the status quo.