The inflation number the Fed secretly cares about

The December consumer price index confirmed that headline US inflation is descending from its summer summit, printing at 6.5 per cent year-on-year. Equity markets reacted with their customary enthusiasm, bidding up tech multiples and pricing in Federal Reserve rate cuts before autumn. But anyone who listens closely to the rhetoric emerging from the Eccles Building knows that the Federal Reserve has already moved past headline CPI and even traditional core CPI. The single statistical metric that now dictates US monetary policy is core services ex-housing—what central bank staff colloquially refer to as "supercore" inflation.

The logic behind this institutional obsession is methodologically rigorous. Headline inflation is dominated by volatile food and energy components, while core goods inflation is rapidly succumbing to the healing of global supply chains and retail inventory liquidations.

The Mechanics of Supercore

Even housing inflation, while currently elevated in official prints, is an acknowledged statistical lagging indicator; private-sector spot market rents have already plateaued, guaranteeing that official shelter numbers will roll over by mid-2023.

This leaves core services ex-housing—comprising healthcare, transportation, hospitality, and professional services—as the only pure reflection of domestic labour market balance. In these service industries, wages represent the overwhelming majority of total input costs, and price-setting behaviour is deeply entwined with nominal compensation gains.

The Wage Anchor

Unlike traded manufactured goods, supercore services cannot be imported from low-cost overseas factories. So long as average hourly earnings compound at 4.5 to 5 per cent, supercore service inflation will remain firmly entrenched near 4 per cent, making a return to the Fed’s 2 per cent target mathematically impossible.

The Federal Reserve cannot declare victory on inflation while its chosen target metric continues to accelerate. Investors fixated on falling gasoline and used car prices are looking in the rear-view mirror; until supercore service inflation capitulates to labour market slack, the Fed's higher-for-longer policy stance remains an unshakeable institutional baseline.