Amazon dethrones Walmart as No. 1 on the Fortune 500. There’s a big upside to their rivalry

In today’s CEO Daily: Fortune’s Phil Wahba reports on the historic reshuffle atop the Fortune 500. The big leadership story: OpenAI CEO Sam Altman says AI super intelligence could someday do his job. The markets: Mostly up, even as investors monitor mounting U.S.-Iran tensions. Plus: All the news and watercooler chat from Fortune. Good morning. There is a new top dog in Corporate America. Walmart, long the largest U.S. company by revenue and No. 1 on the Fortune 500, was eclipsed for the first time ...