Huge numbers of Americans are leaving the workplace in a surprise second wave of the post-COVID retirement boom. Why it matters: An aging country — combined with a booming stock market and a nudge from return-to-office policies — means more working stiffs are preparing to exit the stage. What's happening: The U.S. has about 2.7 million more retirees than predicted‚ Bloomberg reports from a model designed by an economist at the Federal Reserve Bank of St. Louis. That number was 1.5...