Date of Publication : May

Abstract:Digital promo codes are ubiquitous in online advertising, yet marketers often assume the code itself is sufficient to elevate an offer above a plain flat discount. Across four experimental studies (total N = 629) we show that this assumption is wrong: a generic promo code does not reliably generate perceived uniqueness, perceived personalization, or willingness to pay relative to an equivalent flat discount. Consumer response intensifies only when the code is framed or structured to cue the "active ingredient" of promo code persuasion—perceived uniqueness, the subjective sense that the offer is distinctive and tailored to the individual. Study 1 establishes the baseline problem, showing that a standard promo code banner increases click intention and perceived value but fails to produce uniqueness, personalization, or willingness to pay. Study 2 adds a minimal linguistic prime ("Unique offer for you") and shows that uniqueness—not psychological ownership—mediates gains in click intention, purchase likelihood, spending, and engagement. Study 3 shows that explicit behavior-based personalization ("YOURNAME20" tied to browsing history) amplifies uniqueness and personalization beyond both a generic promo code and a flat discount. Study 4 demonstrates that a structural intervention—restricting transferability ("for your personal use only, not shareable")—also manufactures uniqueness, which in turn mediates redemption intention and perceived value. Together, the studies reframe promo codes as a container whose persuasive power depends on what marketers put inside it. We provide advertisers with actionable guidance for designing promo codes that cue uniqueness and personalization to maximize consumer response.

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