Concerned about an AI bubble? Sign up for The Daily Upside for smart and actionable market news, built for investors. Is American Express, described as a victim of the “Ghost GDP” apocalypse in the viral Citrini report on AI’s hypothetical economic fallout, the ultimate doomsday play? In his annual letter to shareholders published Wednesday, AmEx CEO Stephen Squeri promised the company can thrive in the now-arriving and likely disruptive age of agentic artificial intelligence commerce. Better yet, Squeri ...