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?
With the fiat currencies the respective governments/nations of the world has absolute control over their gem through their central banks and they are able to control inflation against their respective currencies by either printing more notes into the system or withdrawing money from the system. This is different with Bitcoin which has no central bank controlling it's flows and so its pump and dump will depend on the demand and supply of Bitcoin at any particular moment.