The essence of the world economy is going up daily. If the world economy just goes down a little, then perhaps the world will suffer a huge economic crisis.
The problem with the current economic system in place is that it is based on the believe that everything is always going to grow, that is why all business are indebted as much as they can to produce as much profits as possible but they are deeply exposed to any financial crisis happening and this is true for governments as well, but that cannot happen, the amount of humans, human knowledge and natural resources are limited so the growth cannot be infinite, which means that the current system will crash at some point in the future.