If the flow of any crypto currency is very large in any country like the flow of bitcoin in china the country can face the change in the economic status. And the currency can also disturb the smooth flow of the money in the country as most of the people will prefer the pear to pear way of currency transfer and storage of currency rather than using banks as a third party involved in every transaction and storage of money. Cryptocurrencies have many advantages over the real-world cash.