The Lombard Review
Economy

Wages are rising — by how much depends on who you ask

Composition bias across wage measures

Workers on a construction site
Workers on a construction sitePhoto: Boudoirphotographyguide / Wikimedia Commons, CC BY 4.0

The release of November's average hourly earnings—advancing at a vigorous 0.6 per cent month-on-month—sent fixed-income algorithms into a defensive crouch. Yet the debate over wage acceleration is increasingly obscured by statistical noise. The headline number reported by the establishment survey is acutely vulnerable to composition bias, where changes in the distribution of low-wage versus high-wage workers distort the aggregate arithmetic. Depending on which barometer a committee member consults, the labour market is either undergoing an unanchored wage-price spiral or settling into an orderly late-cycle moderation.

When lower-wage retail and leisure workers are hired in large numbers, average hourly earnings can appear depressed simply because the denominator expands with lower-paid roles; conversely, when lower-tier hiring pauses, the calculated average mechanically rises. Disentangling true compensation pressure from compositional shifts requires looking beyond headline earnings figures.

Market data screens at the Frankfurt Stock Exchange
Market data screens at the Frankfurt Stock ExchangePhoto: Ank Kumar / Wikimedia Commons, CC BY-SA 4.0

Divergent Methodologies

The Employment Cost Index (ECI) attempts to neutralise these shifts by holding occupational industry weights constant, offering a cleaner proxy for pure employer cost pressures. While the ECI has shown signs of plateauing, the Atlanta Fed’s Wage Growth Tracker—which follows identical individual wage-earners over a rolling twelve-month window—continues to hover near historic highs, propelled by aggressive premia offered to job switchers.

This methodological divergence leaves institutional allocators trading an epistemic fog. Bond desks anchoring their terminal expectations to the establishment survey risk mistaking seasonal volatility in hours worked for enduring structural wage inflation. Meanwhile, equity strategists celebrating softer ECI prints overlook the persistent turnover churn that prevents corporate margins from rebounding.

The Lower Manhattan skyline from Liberty Island
The Lower Manhattan skyline from Liberty IslandPhoto: Percival Kestreltail / Wikimedia Commons, CC BY-SA 3.0

The Margin Squeeze

For corporate treasurers, the semantic dispute between wage indices is irrelevant to bottom-line profitability. Unit labour costs have consistently outstripped baseline productivity gains over the past four quarters, converting nominal compensation gains into an unyielding margin compression.

In highly competitive service industries, the ability to pass on 5 per cent wage increases without triggering volume erosion is rapidly diminishing. Until the wage premium captured by job switchers decisively collapses back toward historical norms, unit labour costs will continue to erode operating margins regardless of which statistical metric policymakers choose to quote.