Each autumn, a number arrives — quiet, mechanical, yet consequential for tens of millions of lives. For 2027, that number is taking shape around 3.5 to 3.6 percent, the largest cost-of-living adjustment to Social Security benefits in three years, driven by inflation's persistent presence in the American economy. The adjustment is not a policy choice but a mirror held up to prices, reflecting back what the economy has done to the purchasing power of those who can least afford to lose it. The final figure will not be known until October 2026, but the trajectory it traces speaks to a broader trut