January 2026 CPI Undershoot Revives Global Disinflation Narrative but Sparks Mixed Policy Signals

Sudden pockets of disinflation paired with sticky services echoes the 1983 U.S. experience, when headline CPI slid below 3 % after the oil-price shock yet the Fed kept rates high until mid-1984 to squeeze residual core pressures. Structurally, today’s numbers sit at the intersection of three long arcs: (1) post-pandemic supply normalisation and AI-driven productivity gains that dampen goods prices, (2) the politicisation of inflation data—visible in both Trump-era victory laps and Ghanaian scepticism—that shapes public trust in institutions, and (3) a 40-year cycle of ever-lower real neutral rates, which makes policy errors more consequential. Whether January 2026 marks the definitive turn toward price stability or just another statistical lull will matter far beyond this business cycle: mis-timed easing after brief disinflation in 1967 and 1976 reignited price spirals, whereas Volcker’s caution in 1985 cemented a multi-decade low-inflation regime. Central banks’ reluctance to declare victory today suggests they remember that centennial lesson—even as markets are tempted to forget it.