As they said a picture is worth a thousand words.
The following map was produce unsing mathematica and the statistical information within mathematica.
The question I asked mathematica is
Color all the countries with GDP per capita smaller than Cuba’s GDP percapita.
We can then see large parts of the world like in Africa and Asia these are the poorest countries is interesting to notice that India and China are included but the reason for that is because these countries are very heavily populated so that will bring down the GDP per capita.
The Mathematica code I use to produce the map above is
Graphics[
{{EdgeForm[Black], White,
CountryData[#, "FullPolygon"] & /@ CountryData[]},
Tooltip[{EdgeForm[Black], Hue[CountryData[#, "GDPPerCapita"]],
CountryData[#, "FullPolygon"]}, #] & /@
Select[CountryData[],
CountryData[#, "GDPPerCapita"] <
CountryData["Cuba", "GDPPerCapita"] &]}]
