"Recognize that every time a dollar is sold for bitcoin, the exact same number of dollars and bitcoin exist in the world. All that changes is the relative preference of holding one currency versus another. As the value of bitcoin rises, it is an indication that market participants increasingly prefer holding bitcoin over dollars [or euro, yen, etc.]. A higher price of bitcoin (in dollar terms) means more dollars must be sold to acquire an equivalent amount of bitcoin. In aggregate, it is an evaluation by the market of the relative strength of monetary properties. Price is the output. Monetary properties are the input. As individuals evaluate the monetary properties of bitcoin, the natural question becomes: which possesses more credible monetary properties? Bitcoin or the dollar? Well, what backs the dollar (or euro or yen, etc.) in the first place? When attempting to answer this question, the retort is most often that the dollar is backed by the government, the military (guys with guns), or taxes. However, the dollar is backed by none of these. Not the government, not the military and not taxes. Governments tax what is valuable; a good is not valuable because it is taxed. Similarly, militaries secure what is valuable, not the other way around. And a government cannot dictate the value of its currency; it can only dictate the supply of its currency."

This is a phenomenal article. Excellent read. Perfectly logical:

https://nakamotoinstitute.org/mempool/bitcoin-is-not-backed-by-nothing/