1. The "Follow the Leader" Effect (Most Common)

Usually, if Bitcoin or Ethereum goes up, it creates positive sentiment. Investors feel confident and start buying other tokens (altcoins) too. This is why you often see the entire market "green" at the same time.

2. When Tokens DO Fall While One Rises

Liquidity Sucking: If a specific token (like a new trending meme coin or a major coin like Bitcoin) is rising very fast, traders might sell their other tokens to "chase" the pump. They move their money into the rising coin, causing the ones they sold to drop.

Bitcoin Dominance: Sometimes, when Bitcoin rises very aggressively, it "sucks the air out of the room." Investors pull money out of smaller, riskier altcoins to play it safe in Bitcoin, causing altcoins to drop in value compared to BTC.

3. The Stablecoin Exception

Stablecoins (like USDT or USDC) are designed to stay at $1. So, if the market is crashing, people sell their tokens for USDT. In this case, the "volume" of the stablecoin goes up, but its price stays the same while everything else falls.

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