That's exactly what the article proposed:
'Drawing on recent empirical evidence, we show that ending poverty and ensuring decent living standards (DLS) for all, with a full range of necessary goods and services (a standard that approximately 80% of the world population presently does not achieve) can be provisioned for a projected population of 8.5 billion people in 2050 with around 30% of existing productive capacity, depending on our assumptions about distribution and technological deployment. "
So if you and everyone are willing to live on 30% less "money", worldwide poverty would be eliminated.