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I imagine people are selling off in light of bitcoin's ATH.

Taking what profits that had from bitcoin cash and investing into Bitcoin to ride out the current bull run.

Then proceed to sell your bitcoin and reinvest more into bitcoin cash

"After pump comes the dump", that and the fact that many places has renamed it to Bcash recently to avoid getting it mixed up with original Bitcoin is likely the cause of this dip.

I am now thinking of selling my BCCs and investing on other AltCoins. :(