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?
fiat price changes depending on the state of the country itself and governments that control their prices in accordance with the country situation but because bitcoin is decentral where only prices of bitcoin are determined by supply and demand, so changes to everything that happens in the country that will have an impact on lowering or rising value fiat not will affect bitcoin