Most people believe that the price of altcoins' is determined by the price of bitcoin and that they tend to follow it's market movements.
I partially disagree with this. I have studied prices of coins and tokens on CMC and the fluctuations of each currency seems to be unique and independent of any other digital currency. Some show strong pumps when BTC goes down and some heavy dumps when BTC is rising.
Undoubtedly, there are market forces and factors which affects most currencies, this is not influenced by bitcoins price, it rather controls bitcoins' price as well as others.
So when trading or investing, make sure you treat each currency differently as they have different utilities.
Actually the movements in the cryptomarket are not only based or depends on bitcoin fluctuations and movements because not only bitcoin are there in the market there are a lot of different coins and tokens that we've founded there. Maybe there are some beliefs that btc are manipulating the movements in the market it maybe because it's because this coins are considered the main cypto in the market that as a big influence and impact rather than the other cypto but it's doesn't means that really bitcoin are manipulating the market because for sure the cryptomarket has it's own system that manages it's own movements.