Let's get a list to start with:
Argentina - Buenos Aires
Australia - Canberra
Austria - Vienna
Belgium - Brussels
Brazil – BrasÃlia
Ethiopia - Addis Ababa and Dire Dawa
Germany - Berlin, Hamburg, Bremen
Russia - Moscow, Saint Petersburg
Switzerland - Geneva, Basel-Stadt
United Arab Emirates - Abu Dhabi, Dubai (et. al.).
India – Delhi, Chandigarh (Union Territories)
Malaysia – Kuala Lumpur, Putrajaya, Labuan (Federal Territories)
Mexico – Mexico City (being the Mexican Federal District)
Nigeria – Abuja, Federal Capital Territory
Pakistan – Islamabad (being the Islamabad Capital Territory)
United States – Washington, D.C.
Spain - Ceuta, Melilla (enclaves)
China - Hong Kong, Macau, Shanghai, Tianjin, Beijing, Chongqing
I populated this list with cities noted from wikipedia, but also added the four "Prefecture-Level Municipalities" of the PRC: Shanghai, Tianjin, Beijing, and Chongqing. First off, what's the best way of determining "rich"? I'd have to say that if the GDP of the city is greater than the national average by a substantial margin, we can consider that city relatively rich. How do the cities stack up?
Buenos Aires makes close to 4x the per capita GDP of Argentina.
"Canberra households had the highest average income of any capital city."
In Germany, Berlin: €24,900; Hamburg: €48,600 (highest in Germany); Bremen: €38,200 (second highest in Germany)...
In China, Macao and Hong Kong are #1 and #2 respectively for per-capita GDP. Shanghai is 8th, Beijing 17th, Tianjin 23rd, and Chongqing 74th respectively. The average per capita GDP in China is between $7400-7500 USD (PPP) depending on whether you trust the world bank or CIA world factbook. All of the cities named above are above that line by at least $1000 USD except Chongqing, which is substantially under.
I ask anyone who reads this to look up the other locations... it seems there is something here. I've got to go back to Thinking in Systems