The world's richest family just got $11 billion richer By: CNBC.com News August 17, 2018 at 14:26 PM EDT The world's biggest retailer reported its best sales in a decade on Thursday, giving the world's richest family an $11 billion boost to its net worth. Read More >> Related Stocks: Apple Berkshire Hathaway Exxon Mobil UnitedHealth Group Wal-Mart Stores, Inc.