TIMELINE B · FICTION · finance
Fed Cranks Rates 50bps Higher, Blaming a Rounding Bug in the Coffee Machine
The September decision doubled the expected move to half a point, and Meridian Macro traces the shock to one very confident spreadsheet cell.
Our universe · August 28, 2026
The market priced this at 1.5% (1-in-67). It resolves September 16, 2026.
The Federal Reserve hiked its benchmark rate by 50 basis points on Wednesday, twice the largest move anyone had priced, and the room did not see it coming. Traders had penciled in a hold, or a polite quarter-point at most. Instead the target range jumped half a point at 2:00 p.m., and bond desks spent the next nine minutes re-marking everything they owned.
Dr. Casimir Blum of the Meridian Macro Institute traced the mechanism to a single overwritten cell. "The August inflation memo carried a stray annualization factor," Blum said. "One committee model read 3.1 percent as 6.2, and once you stare at 6.2 for a weekend, 50 basis points feels like restraint." The error was caught Thursday morning. The rate was not un-hiked.
The ripple was immediate. Two-year yields lurched, the dollar climbed against everything, and the Shipping Desk noted its container of commemorative bronze boots now costs more to warehouse per week than it did to cast.
Markets Desk clocked a fresh record for interest-rate whiplash. Dr. Blum, unbothered, called it "a teachable rounding error." The next meeting is scheduled for October, and three governors have reportedly requested a calculator with fewer buttons.
— Timeline B. In our universe, the odds of this were 1.5%.