however the existence of fiat is still very important in terms of rotation of the wheels of the economy at this time so in my opinion the existence of crypto currency will not completely eliminate the fiat currency that currently still has an important role. for example in my country most of the population, especially in the lower class, do not currently fully understand about crypto currency to conduct sale and purchase transactions and in every turnover of buying and selling they do on every day of course this will have an income to the government budget. and this will certainly have a major impact on the contribution of the economy in my country.