Here is the relationship between Bitcoin Dominance, BTC price and altcoins.

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Here is the relationship between Bitcoin Dominance, BTC price and altcoins.

If dominance increase with price then we see a dump in altcoins.

If dominance increases and price decreases then we see a heavy dump in altcoins.

If dominance decreases and price increases then we see a big pump in altcoins.

I have covered all scenarios in the image, have a look at that.