I noticed that the price of Bitcoin change much like all altcoins.
But the price of other traditional currencies like the euro, for example, are stable and do not change much.
It is the government that control their prices?
That becouse not all bitcoin in exchange is use able and bitcoin spreading is not so good. So if the hoarder buy a lot of bitcoin, it price will aoutomaticaly rise but if they sell the bitcoin, the price will be drop.