Bitcoin has definitely contributed in a very significant percentage in the world economy .
Bitcoin is said to be world's firth largest currency , so it has definitely had some major influence on the world economy . We still measure the price of bitcoin comparative to dollar , so technically it may also have surpassed dollars and what about counting the bitcoin that are dumped or sold . They hold some value too .
This is just the beginning , the major effects have just started to show up.
You are right, it has actually an impact in the world, because bitcoin contributed to the individual and with that every individual has the chance to gain more money and to purchase things what they want without thinking of the price, so they are helping every businesses too and so on.