My concern with Cryptocurrencies stem from the apparent lack of control but in reality it's not quite like that.
With the major currencies, users can see the holdings in any account, it's all within the blockchain.
What you don't know is who owns the account.
As will any other "commodity" sales and purchases can impact the pricing or perceived value of said "commodity". If an account that holds a huge value of BTC for example, account 16ftSEQ4ctQFDtVZiUBusQUjRrGhM3JYwe which holds 168,791 worth about USD 7 billion! If that account holder decided to sell all their BTC then the price would likely plummet.
Imagine if BTC became a de-facto currency and a bad actor (country or criminal or organisation) had a huge holding, they could easily manipulate the world economy. I know similar things can be done with national currencies but there are levers (like interest rates) that can be brought in to play to protect the currency. There are none with cryptocurrencies.
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