What country has the greatest difference in the individual wealth -- that is the amount owned by the wealthiest and the poorest people?

Individually, that would be Mexico, the home of the wealthiest person in the world, Carlos Slim, and home of some of the poorest people of the world--the Gross national income (GNI) of Mexico in 2009 was $8,960.00 (USD), and the percentage of those living on less than $1.25 (USD) per day was 4%.

*The source is in the related link below.