On a Wednesday in September 2026, the American economy offered a complicated gift to its central bank: consumers spent more than expected in August, broadly and robustly, even as the shadow of inflation stretched across the data. The Federal Reserve, already poised to make a consequential decision about interest rates, must now weigh a familiar paradox — that the very vitality of an economy can become the source of its next wound. In the long arc of monetary history, strength and risk have rarely traveled far apart.