user: ### NOW ANSWER:
Question: What's the source of wealth of the person worth $17 billion?
Columns: ['Name', 'Birth year and age', 'Net worth US$ (billions)', 'Citizenship', 'Source']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Liliane Bettencourt', '1922/1923(age 90–91)', 30.0, 'France', "L'Oréal , inherited"]
SQL:

assistant: SELECT "Source" FROM "Table" WHERE "Net worth US$ (billions)" = 17.0;