in my opinion, international relations greatly affect the world economy. for example, a trade war between China and America. the policies of each country have a negative impact on the world economy. and the war in the Middle East that has never stopped making turmoil in world oil prices which has an impact on the world economy. so that the international relations of each country have a negative and positive impact on the world economy.
I guess ots good if the economy rises every year than falling because there's has a good effect not only to their economy but also to their country. While have a better world economy I think can be happen but not that easy because not all country have the same policies, and there are some country that experiencing a not good economy. But if all countries help each other then surely world economy will be better every year.