The world's 500 richest people increased their fortunes by $852 billion in the first half of 2023, with each member of the Bloomberg Billionaires Index making an average of $14 million per day. The gains were driven by a stock market rally and a surge in tech stocks due to investor interest in artificial intelligence. Elon Musk and Mark Zuckerberg saw significant increases in their net worth, while Gautam Adani experienced the largest decrease.