If it's poverty en masse then it's either due to environmental factors such as say being situated in a desert lacking basic resources, or a corrupt oppressive government controlling everything. I think those are the big ones.
The world has more than enough resources to feed its inhabitants specially human. Highly developed countries are wasting thousand tonnes of food while developing countries are facing starvation. The very reason is greed, it is the worst values known by man ever since. 20% of the world's population are rich and enjoying the 80% world's resources unlike the 80% of the populace belongs to poverty line and they only consume 20% of the resources. If most of the people will only learn how to share we may not hear or see the word poverty frequently.