Picture an online ad for premium wireless earphones, the kind that usually cost a few hundred dollars, suddenly offered for less than the price of a coffee. Something feels off. A bargain that large hints that the product might not match its glowing description. Yet plenty of people click “buy” anyway. Who are they, and what pushes them past their doubts?
A study published in Marketing Intelligence & Planning set out to answer that question. The researchers found that consumers who believe they know a lot about a product, even when they actually don’t, tend to be among the most likely to take the bait. The team also examined how the option to return a purchase changes the picture, and that twist produced some of the more surprising results.
The puzzle of knowing too little, or thinking you know too much
The work was led by Yangchun Li of the School of Management at Zhejiang University of Technology, along with colleagues at several Chinese universities. Their starting point was a familiar idea in marketing: product knowledge usually protects shoppers. People who understand a category can spot quality signals and detect when an advertisement is stretching the truth.
But knowledge has a layered structure. Researchers distinguish between two kinds. Objective knowledge is what a person actually knows, the facts they can get right on a quiz. Subjective knowledge is what a person believes they know, their confidence in their own understanding. These two do not always line up.
That gap lets shoppers be sorted into types. A “novice” scores low on both. An “expert” scores high on both, with confidence matched to real knowledge. A “snob,” in the study’s terminology, scores high on confidence but low on actual knowledge. This mismatch, where belief outruns fact, is what the field calls knowledge miscalibration. The authors wanted to know whether snobs, despite feeling informed, are more easily fooled than people who genuinely know the product, or even people who know they know little.
One more piece mattered to the team: the price-quality inference. Shoppers often treat a higher price as a sign of better quality, and a suspiciously low price as a warning. When an ad pairs a premium quality label with a rock-bottom price, that mismatch can trigger skepticism. The question is whether different shoppers act on that skepticism or override it.
Adding a safety net to the mix
The researchers layered in a second factor that has become common in modern shopping: the ability to undo a purchase. Lenient return policies and money-back guarantees, like the European Union’s 14-day right to return any online order without giving a reason, let consumers reverse a decision after the fact. The study calls this decision reversibility.
Earlier research had reached conflicting conclusions about what reversibility does to shoppers. Some studies suggested it makes people buy more impulsively, since they can always send the item back. Others found it makes people more deliberate, since the option draws attention to what might go wrong. The authors suspected that a shopper’s knowledge type might help reconcile these opposing findings.
How the experiment worked
The team ran an online experiment with 508 participants recruited through Credamo, a Chinese behavioral research platform comparable to survey tools used in the United States. The design crossed three knowledge types (novice, snob, expert) with two decision conditions (reversible and irreversible).
Before seeing any ad, participants took a quiz about earphones. Eight true-or-false statements, drawn from expert blogs and interviews with professionals, measured objective knowledge. For each answer, participants also rated how confident they were, which captured subjective knowledge. Using a statistical grouping method called K-means clustering, the researchers sorted people into the three types. (A fourth possible group, modest shoppers with high real knowledge but low confidence, was too small to analyze and was set aside.)
Everyone then saw a poster ad for a fictional brand of high-fidelity, or “HiFi,” earphones. HiFi is a label suggesting faithful, high-quality sound reproduction. The ad listed appealing features and offered the earphones for ¥12.9 (about $1.78), a steep drop from a stated original price of ¥129. Regular HiFi earphones in China typically run into the hundreds of yuan, so the deal was meant to look too good to be true.
The return policy was where the conditions split. In the reversible version, the ad promised a full refund within seven days for any dissatisfied buyer. In the irreversible version, it stated that all sales were final unless the product was defective. Participants then decided whether to buy, and the platform recorded how long they took to choose. They also rated how skeptical they felt about the ad.
What the numbers showed
The manipulation worked as intended: across every group, participants reported high skepticism toward the ad. The interesting part was who bought anyway.
When returns were not allowed, snob consumers were the most likely to purchase, ahead of both experts and novices. Their confidence appeared to override the warning signal sent by the low price. Experts, by contrast, bought at a low rate, close to that of novices.
The researchers also looked at how skepticism connected to buying. For experts and novices in the no-return condition, higher skepticism was linked to a lower chance of purchase, meaning their doubts steered their behavior. For snobs, skepticism and buying were not significantly connected. The authors interpret this as a sign that snobs’ inflated sense of knowledge masks their doubts, letting the low-price lure win out.
When returns were allowed, the pattern shifted. Now both novices and snobs were more likely to buy than experts, who again resisted. The ability to return the product seemed to act as a safety net that loosened the link between doubt and restraint, but only for some groups. Among novices, the return option produced a large jump in purchase likelihood. Among snobs and experts, the option made little statistical difference.
This points to a distinction the authors draw out. Novices appear to lean on the return policy itself as a reason to buy, treating it as a reassuring side cue rather than evaluating the product claims closely. Experts tend to focus on the product details and stay skeptical whether or not they can return the item. Snobs behave consistently across both conditions, guided by their own confidence rather than by the policy.
The timing data, analyzed with a method called survival analysis that tracks how quickly people reach a decision, reinforced this. Snobs decided quickly in both conditions, consistent with relying on mental shortcuts rather than deliberation. Novices took longer when returns were off the table but sped up when a refund was available. Experts also decided faster when they had the safety net of a return option.
What it suggests for shoppers and regulators
The authors argue that their results complicate the comforting assumption that knowledge always shields consumers. A confident self-image, when not backed by real understanding, may quietly disarm a shopper’s defenses against a deceptive deal.
They also raise a caution about consumer-protection policies. Generous return options exist to safeguard buyers, but the findings suggest that dishonest advertisers could exploit them, since the promise of a refund nudged novice shoppers toward buying questionable products. The researchers suggest regulators consider discouraging advertisers from spotlighting return policies as a selling point, and encouraging shoppers to scrutinize claims rather than rest on the assurance of a refund.
A few limits are worth keeping in mind. The experiment tested a single product, earphones, whose quality is hard to judge before use. The authors note that deception may play out differently for items with more measurable attributes, such as a flash drive with a stated storage capacity. The study also stopped at the moment of purchase and did not track whether buyers actually returned the misrepresented products afterward, a step the researchers flag as a question for future work.
