One of the reasons why the btc fluctuates so much is the price of this currency has a more direct relationship with the supply and demand of it, than that of traditional currencies. In the case of the dollar or the euro, for example, their contributions may be affected by economic, political or social factors. Thus, an expansive or contractive monetary policy, a warlike conflict or capricious decisions of the authorities; They will influence the price of the currency issued by a central bank. But not in the price of bitcoin, or not so directly.