Who's rich you ask?
Look at the L curve distribution
What's more interesting to consider...
The estimated world GDP is about $70,650,000,000,000 and the world has approximately 6,800,000,000 residents in 220 countries. The average person makes $10,390 or so. The USA's GDP is about $14,441,000,000,000 and has about 309,000,000 residents. That's about $46,730 per capita; a household of 3, on average, makes $140,200 each year. Luxemburg makes an average $94,400 per capita, Norway $76,700, If you want to talk about rich, talk about Americans and many Europeans.