And one of the area cryptocurrecy contribute to the economy of a country is,
Cutting out the middle man. International transfer transactions require entities like clearing houses, banks, and SWIFT (Society for Worldwide Interbank Financial Telecommunication). It is an organization that provides a network for financial institutions all over the globe to transmit information to each other in a safe and secure network. No international money transfer can happen outside of the SWIFT network. There are transaction fees and it takes several days for some transactions to be processed.
With the the use of cryptocurrencies like Bitcoin, Litecoin, Dash etc, this middleman is no longer required for authorizing and authenticating transactions. The transaction fees are minimal, as low as a couple of cents in some of these cryptocurrencies. Not to mention, the added allure of anonymity and privacy that is associated with cryptocurrencies. Just when you thought that was all, you then realize that transactions occur in a matter of seconds and minutes.