2. Christy Walton & family

•  Net Worth: $28.2 B                                                                      
•  Source of Wealth: Wal-mart
•  Citizen: United states
•  Age: 58

Being the second richest woman in the world, Christy Walton ranks #11 in the list of rich people in the world. (Source) She is widow of John Walton. Her father-in-law was Sam Walton who is the founder of largest retailing chain Wal-Mart. Currently, she resides in United States which is also her birthplace. Her major chunk of net worth is because of stocks in Wal-mart and in First Solar Company. Her wealth is inherited and not self-made. She is the richest woman billionaire in United States of America.