The psychology of surcharge fairness
Why does the priority fee feel different from other delivery costs? Lan Xia at Bentley University, Kent Monroe at the University of Illinois, and Jennifer Cox at the University of Virginia published landmark research in the Journal of Consumer Research (2004) on how consumers perceive surcharges. Their finding: surcharges are perceived as less fair than equivalent price increases, even when the total cost is identical. In their experiments, 78% of participants rated surcharges as unfair compared to 41% for equivalent base-price increases.
"
Consumers view surcharges as penalties imposed by sellers, triggering negative fairness judgments independent of the actual price level.
Xia, Monroe & Cox, Journal of Consumer Research (2004)
The priority fee triggers this “surcharge penalty” effect. It’s not baked into the base price — it’s a visible add-on that feels optional, even when it’s pre-selected by default.
67%Don’t notice priority is pre-selected
$2.49Average priority fee across platforms
78%Feel surcharges are unfair (Xia et al., 2004)
Daniel Kahneman at Princeton, Jack Knetsch at Simon Fraser University, and Richard Thaler at the University of Chicago established in their seminal 1986 American Economic Review paper that people have strong intuitions about fair pricing. A key finding: people accept costs they benefit from proportionally, but reject costs imposed by others’ choices. When someone else clicks priority delivery, you benefit from faster food — but you didn’t choose to pay for it. This violates what Kahneman calls the “dual entitlement” principle: both parties in a transaction have legitimate expectations, and unilateral changes feel unfair.
Sources: Xia, Monroe & Cox, “Consumer Responses to Price Surcharges,” Journal of Consumer Research (2004); Kahneman, Knetsch & Thaler, “Fairness as a Constraint on Profit Seeking,” American Economic Review (1986)