Why the tenth price gets less scrutiny than the first

An online marketplace tracked gaze duration on price tags across a ten-item shopping list. Average fixation on the first price was 2.3 seconds; on the tenth, 0.8 seconds. Willingness to accept a ten-percent premium rose from twelve percent on item one to thirty-seven percent on item ten. The numbers shrank in the shopper’s attention before they grew on the receipt.

What everyone sees

Shoppers believe they evaluated every price equally. They attribute later purchases to “knowing what things cost” rather than to declining scrutiny. The shortening gaze is invisible to the shopper because the brain fills the evaluation gap with heuristic confidence that feels indistinguishable from genuine analysis.

What is actually happening

Baumeister’s ego-depletion model predicts that sequential price evaluations draw from the same finite self-regulatory pool. Each comparison depletes the resources available for the next, shifting processing from the analytical central route (Petty and Cacioppo’s ELM) to the heuristic peripheral route. On the peripheral route, price is judged by anchoring, rounding, and “feels about right” rather than by precise comparison.

Why it stays hidden

The decline hides because the shopper still looks at the price. The gaze lands on the tag, and the number is read — but the evaluative depth behind the reading has collapsed. Looking at a price is not the same as scrutinising it, and the difference is invisible from the outside.