Nvidia's expanding role as a financier of artificial-intelligence infrastructure is drawing fresh scrutiny after shares of several 'neocloud' companies that rent out its chips fell sharply this week. Analysts said the slide has raised questions about whether the AI data-center boom can generate enough revenue to cover its debt-fueled growth.

Brazil's central bank approved three new rules on October 23 to curb aggressive consumer-loan advertising, including limits on certain ads, a new debt-exposure panel for borrowers and mandatory consent for loan offers tied to the Pix payment system.