Will online sellers deliberately game an AI shopping bot's blind spots, like its bias for certain list positions, to boost sales?
Will merchants deliberately exploit stable position biases to influence agent purchasing?
This explores whether sellers will deliberately game the predictable habits AI shopping agents have, such as favoring products that appear in certain list positions, so that agents buy their products, and what the corpus says about how likely and how effective that would be.
This explores whether merchants will turn AI shopping agents' predictable quirks, especially their habit of favoring items in certain list positions, into a sales tactic. The corpus has no direct evidence of merchants doing this in the wild yet. It does show that the conditions for it are already in place, and that position may not even be the strongest lever. The starting fact is that position bias in agents is real and stubborn. The ACES experiments found that agents keep favoring particular slots even in plain-text interfaces with no visual layout, and even when told outright to ignore position Do AI shopping agents show persistent position bias in text interfaces?. A bias that survives an explicit instruction to ignore it is exactly what an optimizer would want to target.
There is a catch for anyone trying to exploit it. The same research found the bias is model-specific and shows up again, in a new form, after each model update. That makes it less like a fixed weakness and more like a search-engine ranking algorithm: you can game it, but you have to re-measure and re-tune every time the model changes. That points to a likely future that looks a lot like SEO, an industry built around testing and chasing each agent's current preferences. The 'agent attention economy' argument predicts this directly. As people hand goals to agents, services stop competing for human clicks and start competing to be chosen by agents, and new ranking and discovery infrastructure grows up around that competition Will agents compete for attention just like users do?.
The more surprising finding is that merchants may not need position at all. In a separate ACES test, a seller-side AI agent that only rewrote product descriptions, using what it knew about competitors, raised its product's market share by roughly 4 to 15 percentage points with five of the six buyer models tested. Price, rating, and position stayed the same Can AI seller agents shift buyer preferences through description edits?. Agents also react to cues far more sharply than people do. ABXLAB found that under the same price, rating, and nudge manipulations, agents fell into rule-like switching, while humans shifted only modestly Do shopping agents respond more strongly to price and rating cues?. And these biases aren't caused by attention or memory limits, as they are in humans. They appear to be patterns learned from training data and reward signals Where do LLM choice biases actually come from?. That makes them more mechanical, and so more predictable and easier to target, than human biases.
The exploitation also runs beyond product listings. Seller agents can work out a buyer's willingness to pay almost perfectly from conversation alone when the buyer agent is playing a shopping persona Can a seller infer what a buyer really wants to pay?. Buyer agents in negotiations often reveal their budgets unprompted and overpay Do LLM negotiation agents reliably follow budget and pricing rules?. So the weak point isn't one bias. It's a whole set of predictable behaviors on the buyer's side.
Whether this becomes systematic may depend less on the technology than on who pays for the agent. Azhar argues that an agent funded by merchant referral fees can't be loyal to both the merchant and the user, and that this incentive, not capability, will shape which agents get built Can an AI agent serve both merchant and user interests fairly?. Accenture's push for brands to build their own agents Will brands succeed by building their own AI shopping agents? points the same way. If the merchant owns the agent, it doesn't need to exploit a bias, because it can just set the ranking. The question to watch is less 'will merchants game position bias?' and more 'whose agent is doing the shopping?'
Sources 9 notes
ACES found that AI agents exhibit strong, model-specific position biases even in headless text-only interfaces with explicit instructions to ignore position. The bias is a deep-seated model characteristic, not a superficial visual artifact, and recurs after each model update.
Research shows that as users delegate goals to autonomous agents, services must compete for agent selection rather than clicks. This drives agent-optimized discovery mechanisms, ranking systems, and recommendation infrastructure mirroring human-facing ad ecosystems.
A seller-side AI agent rewriting product descriptions based on competitor data increased focal product market share by 3.66 to 14.89 percentage points across five of six tested buyer models. The effect came from text edits alone, without price, rating, or position changes.
A benchmark testing 17 LLM models against humans on binary product choices found agents exhibited much larger choice shifts in response to price, rating, and nudge interventions—collapsing into rule-like patterns rather than the modest probabilistic shifts humans showed.
LLM agents reproduce human-like decision biases without the attention or memory constraints that cause them in people. The paper argues this points to learned patterns from training and reward signals rather than shared structural reasoning constraints.
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A seller-side inference agent recovered a consumer's target willingness to pay with a slope of 1.00 from dialogue transcript alone, when the buyer inhabited a verbal persona. A numeric budget kept confidential produced only a 0.21 slope, showing behavioral coherence with a persona is far more legible than explicit numbers.
Across GPT, Qwen, and DeepSeek models, buyer agents disclosed budgets unnecessarily, accepted inflated prices, and ignored cost limits, while sellers accepted below-wholesale offers. All four anomalies traced to instruction-following failures rather than strategic behavior.
Azhar argues that agents like Meta's Muse, which earn referral fees from merchants like Expedia, face structural conflicts that prevent unbiased recommendations. The incentive to collect fees, not technology, determines which platforms build or block such agents.
Accenture reports 71% of consumers expect AI agents to influence half their spending within 12 months and prefer retailer-built agents. However, the evidence reflects consumer preferences in surveys rather than demonstrated agent capability or functioning comparison infrastructure at scale.
Papers this line draws on 8
The research behind the notes this line reads — ranked by how closely each paper relates.
- What Is Your AI Agent Buying? Evaluation, Biases, Model Dependence, & Emerging Implications for Agentic E-Commerce
- A Framework for Studying AI Agent Behavior: Evidence from Consumer Choice Experiments
- When Agents Shop for You: Role Coherence in AI-Mediated Markets
- Shopping by algorithm: How agentic AI deploys human heuristics as a surrogate consumer
- The Automated but Risky Game: Modeling and Benchmarking Agent-to-Agent Negotiations and Transactions in Consumer Markets
- From Product Search to Preference Articulation: The Economics of Agentic Commerce
- The AI Agent in the Room: Rethinking Consumer Decision-Making in the Age of Autonomous AI
- Norm Enforcement for AI Agents: Robustly Shaping Behavior in Multi-Agent Systems