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This was my first thought, but why does BTC goes up by XX.XX%, while some coins go up by XXX.XX% ?
When bitcoin goes up people have more money to invest and some groups use that to ship a ton of money into alts.
Bitcoins marketcap is like 40Bn if someone took 1% of that and put it in (insert alt coin here) that coin would go through the roof.
If we took 40MM and put it into Bitcoin the price of bitcoin wouldn't rise that much.