FIAT money is our daily currency which has been existing here for hundreds of years, when crypto currencies like Bitcoin is squeezing their way up to become a world currency and sort. Can they co-exist? If so then what benefits we can get from them, altogether? Not separately.
Fiat money and bitcoin can be side by side as payment. Fiat money usefull to picture the economic condition and used in a country. Bitcoin as currency can used globally and i am believe people will use it when trying to travel