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.