All altcoins are very stable today.
Does anyone know why there is no movement of altcoin

This is very confusing to me.
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At a serious guess is everything is stable/slight moving up because traders aren't sure what is going to happen with Bitcoin and are waiting to see how it pans out. Most of the sellers exited a long time ago and after dumping to lows smart money is accumulating quietly in preparation of an alt bull run.