The UN Sustainable Development Goals aim to address the inequalities in a nation, regardless of state of development. Our developing/developed framework is out of date (it’s a bad map!), what should we use instead? Hans Rosling proposes a 4-level model which breaks down the global population into levels based on income. The one billion people on Level 1 make $0–$2/day. The three billion people on Level 2 make $2–$8/day. The two billion people on Level 3 make $8–$32/day. And the one billion people on Level 4 make more than $32/day. This is all expressed in the simple picture. 

This 4-level breakdown is helpful because it more accurately reflects an individual’s actual life situation. (The map is not the territory, but this is closer.) i.e. You don’t just go from extreme poverty to hanging on a yacht.

Lindmark, R. (2018, September 30). Expanding Hans Rosling's "Factfulness": Why We Should Use 5 Levels Instead of 4. Medium. https://medium.com/@RhysLindmark/a-critique-of-hans-roslings-factfulness-why-we-should-use-5-levels-instead-of-4-dccaac0440b4.