Here is a list of the richest and the poorest countries in the world ranked according to GDP per capita.
Richest
1: Qatar $124,927
2: Macau $114,430
3: Luxembourg $109,192
4: Singapore $90,531
5: Brunei $76,743
Poorest
1: Central African Republic $681
2: Democratic Republic of Congo $785
3: Burundi $808
4: Liberia $867
5: Niger $1,153