In my observation in bitcoin price !!
I think the WHALES are the manipulators of shifting price of bitcoin and alt coins
Why?
Because whales are buying huge amount of coin, in this case there will be a sharp rise in prices and also because of this demand will increase and many investors will be able to invest, so the outcome is,WHALES had a large profit on their money or capital, i think this is why the alternative currency increases.
and after they buy it they will sell their coins that will cause a sudden fall in its price of alt coins.
And where exactly have you pbserved this trend? The theory is old, it is sound usually, but most people who repeat the theory actually haven't seen evidence themselves.
Whales buying price up, whales selling price down. If this were the straightforward case, wouldn't we just be seeing Mt Gox trustee levels of selling and buying every few months?
Lesson about Bitcoin price: all the theories come after the fact. No one can still pin down the exact reasons driving price movement.