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Used car dealers exploit buyer psychology to inflate prices: Study

Research into millions of vehicle transactions reveals that dealers strategically price used cars just below round-number mileage thresholds to capitalise on consumer cognitive biases. The pricing practice exploits buyers' tendency to focus on the first digit of odometer readings rather than scrutinising actual mileage differences.

LSN India · 26 October 2026

Used car dealers exploit buyer psychology to inflate prices: Study

A comprehensive analysis of used car market data has uncovered a systematic pricing pattern that allows dealers to command premium prices for vehicles with mileage readings strategically positioned below psychological thresholds. The study, which examined millions of transactions, found that cars with odometer readings just under round numbers—such as 99,999 km instead of 100,000 km—consistently sell at higher prices than their actual condition and mileage would typically justify.

The phenomenon stems from what researchers term "left-digit bias," a cognitive shortcut where consumers disproportionately weight the leftmost digit when evaluating numerical information. When examining a used car's mileage, buyers tend to focus primarily on whether the reading starts with a lower number, often overlooking the significance of incremental differences in the subsequent digits. A vehicle showing 79,999 km appears substantially different to buyers than one displaying 80,000 km, despite only marginal actual differences in wear and tear.

This psychological vulnerability creates a lucrative opportunity for dealers in the used car market. By pricing inventory strategically—placing vehicles with sub-threshold mileage at higher price points—dealers effectively capitalise on consumer inattention to secondary numerical details. The pricing premium persists because most buyers fail to recognise that the marginal additional mileage beyond a round number threshold rarely justifies the corresponding price discount.

The findings have implications for Indian consumers navigating the country's substantial used vehicle market, where pricing practices often reflect both regional variations and dealer sophistication. Experts suggest that buyers adopting more rigorous evaluation methods—comparing vehicles across broader mileage ranges and focusing on absolute usage rather than psychological thresholds—can better assess fair market value and avoid overpaying based on cosmetic mileage formatting.