A new visualisation recently appeared on a popular data subreddit.
It sorted the richest people in the world not only by their net worth, but their ages.
Prominent was the absence of Europeans in the higher echelons of wealth - which Bill Gates topped.
So we tracked down the richest person, as defined by the chart's source - Forbes - in each country.
Selected countries by richest person's net worth:
Countries only included if richest person's net worth is above a billion and included on the Forbes list.
Dietrich Mateschitz - $13.4 billion
Albert Frere - $4.9 billion
John Fredriksen - $9.9 billion
Petr Kellner - $12.2 billion
Kjeld Kirk Kristiansen - $21.1 billion
Antti Herlin - $3.5 billion
Bernard Arnault - $41.5 billion
Bidzina Ivanishvili - $4.5 billion
Beate Heister & Karl Albrecht Jr. - $27.2 billion
Philip Niarchos - $2.5 billion
Thor Bjorgolfsson - $1.8 billion
Pallonji Mistry - $14.3 billion
Maria Franca Fissolo - $25.2 billion
Bulat Utemuratov - $2.3 billion
Christoph Zeller - $2.7 billion
Tatiana Casiraghi - $2.4 billion
Charlene de Carvalho-Heineken - $12.6
Odd Reitan - $5.3 billion
Dominika & Sebastian Kulczyk - $3.6 billion
Americo Amorim - $4.4 billion
Ion Tiriac - $1.1 billion
Leonid Mikhelson - $18.4 billion
Ivan Chrenko - $1.1 billion
Amancio Ortega - $71.3 billion
Stefan Persson - $19.6 billion
Ernesto Bertarelli - $8.6 billion
Murat Ulker - $3.7 billion
Rinat Akhmetov - $4.6 billion
Hinduja family - $15.4 billion