The Price Tag Is an Interface

A tag does more than transmit cost. It directs attention toward a reference price, a unit, a discount, or the absence of one; hierarchy tells the shopper which number to read first.

Ethical price design keeps the payable total most prominent and places conditions beside the claim they qualify. If understanding depends on hunting through footnotes, the interface has failed even when the arithmetic is technically present.

A price is read through design before it is judged through arithmetic.