Digital transaction using crypto currency has a very little effect on World Economy, yse, it may affect the market trading base on the volume of share movement the treed. The entry of crypto currency in market trading had only open a lot of investor to participate on trading of such ALT coin project. The market are more exiting as if one investor is monitoring the movement of crypto coin on the treed. Just like what had happened on the previous month when the Bitcoin price drops and drops until it stabilized after the correction of its market. On the other hand World economy was not affected by the event on crypto market trading.
As we speak now it might be a really small market but if you look at the rate in which this market is evolving there is no doubt it will have an impact in the world. Right now majority of the users are not really taking advantage of the transaction service these coins provide rather everyone wants to make money hoarding the coins, but eventually it will change and it will be the major factors in economy.