*How does Bitcoin adjust to the market after this kind of meeting and announcement by the FOMC affects interests rate of fiat and devalues it(Bitcoin) ?
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What the Fed does affects the economy in general and therefore also affects bitcoin, but the fact that the price of bitcoin has dropped by 1% after the announced quarter point hike may have nothing to do with it. A rise or fall of 1% is within the normal volatility of the bitcoin price, it is even low volatility.
Bitcoin's value is largely determined by the market forces of supply and demand, and external factors such as inflation and interest rates can have an impact on the value of the USD, which in turn can affect the value of Bitcoin when it is paired with the USD.
Bitcoin is not directly controlled by any central authority or institution, including the FOMC or the Federal Reserve. However, the USD is still the dominant currency in the world, and the value of Bitcoin is often expressed in USD terms, making it vulnerable to changes in the USD's value and other external factors that affect the USD.
Good point. I would also add that central bank policies affect the price but not only because of the bitcoin-fiat countervalue but also because if central banks flood the markets with money, much of that money will end up in financial assets such as bitcoin, and conversely, when there is tightening, it is normal for people to sell financial assets, such as bitcoin, to obtain liquidity, which in turn causes the price to fall.