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I think its because so many other coins are pegged to the value of bitcoin from the start that they all follow the charts, there are a few day traders I know who, when they talk about the price of a coin they refer to it in bitcoin price as opposed to USD price, and when BTC dips they sell and buy on the same charts, so this is what i think has become of the market, Bitcoin has become the American dollar of the crypto world

Makes sense to me.