Why Altcoins price depends on bitcoin value ? Its always going up and down when the bit coin price change.
Altcoins price value are volatile because they're all being paired with Bitcoin and not through USD.
People would invest into Bitcoin or Ethereum and then they will use Bitcoin or Ethereum to invest altcoins so when Bitcoin drops, ethereum and Altcoins will drop as well and almost all altcoins' price value in terms of Crypto market capital were valued through Bitcoin and then USD pair.