There’s the Gini coefficient , which is an index for social inequality. Its easier to spot the blue countries and guess if you’d like to move there.

Edit: although looking at the map, its strange to see India and Japan having the same color. Anecdotally, I think the gap between rich and poor is much greater in India than in Japan, education and drinking water for example. Ive lived in both countries, and I think India should be yellow or orange, like southeast Asia.