Did shoppers really spend 3% more in January?

The release of January’s US retail sales data delivered a thunderous headline advance of 3.0 per cent month-on-month, extinguishing talk of an imminent consumer rollover and prompting economists to scramble for their growth models. Commentators heralded the unstoppable vitality of the American consumer, who appeared entirely immune to Federal Reserve interest rate hikes. But any quantitative analyst who inspects the statistical plumbing behind retail sales knows that January figures are heavily warped by seasonal adjustment algorithms designed for a normal pre-pandemic economy. Far from demonstrating a miraculous boom, the 3.0 per cent surge was an immaculate statistical artifact of residual seasonality.

The unadjusted reality of January retail sales is that spending collapses every year after the December holiday splurge. The Bureau of Labor Statistics and Census Bureau apply massive seasonal multipliers to smooth out this predictable post-holiday plunge.

The Seasonal Distortion

In January 2023, however, unseasonably mild winter weather and residual post-holiday promotional clearance sales meant that unadjusted spending dropped by less than the algorithm historically anticipated.

When the seasonal adjustment formula applied its standard aggressive upward revision to a milder-than-expected seasonal decline, it generated a synthetic, phantom surge in adjusted headline spending. Consumer behavior had not radically expanded; it had merely declined less abruptly than in a typical frozen January.

Income Decoupling

Crucially, this apparent consumption boom was entirely decoupled from underlying household real wage generation. Real disposable personal income continues to compound at a muted pace, and the personal savings rate remains stuck near historic lows.

Consumers did not suddenly enjoy a 3 per cent expansion in genuine purchasing power; they spent residual holiday gift cards and relied on short-term revolving debt. Mistaking a seasonal adjustment quirk for enduring consumer resilience is a perilous macro error; once the statistical distortion fades, aggregate demand will swiftly realign with stagnant real purchasing power.