Since most of the alt coins are traded with BTC or ETH. SO I think altcoins prie are dependent on the price of this two.
What is your opinion please share.
The answer is simple, regarding the sphere or cryptocurrency the big influencer is Bitcoin, conforming with the prove evolution of BTC the others coins go up or down.
The thing that makes altcoins depends on bitcoin and ethereum is that most altcoins trade with bitcoin, when the price of bitcoin drops then automatically the value of altcoins also drops and vice versa.