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Bitcoin is not much different from investment products that are already circulating in the world, the cause of the price rising or falling is of course due to market demand. Bitcoin price may not go up and down because of the role of 1 person, the conclusion that drives the price of Bitcoin is all of us (buyers, HODLers, and sellers of Bitcoin)..
Btw, no one can control the market. You're right, that the key is demand. when demand increases, there is an increase in a positive trend, which means that the desire to buy bitcoin increases. this is what makes prices go up, in theory. In some cases, bitcoin price can be affected because a large number of BTC holders move their wallets, but I'm not really sure about that