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arxiv: 2404.07409 · v1 · submitted 2024-04-11 · 💻 cs.HC

Too good to be true: People reject free gifts from robots because they infer bad intentions

Pith reviewed 2026-05-24 02:43 UTC · model grok-4.3

classification 💻 cs.HC
keywords human-robot interactionphantom costsgenerositysocial inferenceembodimentdecision makingoffer acceptanceintent attribution
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0 comments X

The pith

People reject overly generous offers from robots because they infer phantom costs or bad intentions, mirroring the effect with humans.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper tests whether people imagine hidden phantom costs in overly generous offers from robots, as they do from humans. In the study, participants received either a cookie or a cookie plus two dollars from a human or robot agent shown on screen or physically embodied, then decided to accept or decline. Results indicated lower acceptance for the more generous offer from robots across both embodiment types, though overall acceptance was higher for robots than humans. Embodiment increased acceptance for human offers but made no difference for robots. This shows people apply social reasoning about hidden motives to robots and that such inferences shape their choices in interactions.

Core claim

Participants perceived phantom costs in the cookie plus two dollars conditions when interacting with a robot, across both embodiment levels, leading to lower acceptance of the more generous offer. The same pattern appeared with human offerers. People were more likely to accept offers from a robot than from a human overall, yet accepted offers from physically embodied humans more often than screen ones while showing equal acceptance for robots regardless of embodiment. The work concludes that people treat robots as social agents possessing hidden intentions and knowledge, which in turn shapes their behavior toward them.

What carries the argument

The inference of phantom costs from an overly generous offer with no apparent reason.

If this is right

  • Robot designers should avoid making offers that appear overly generous without clear justification to maintain higher acceptance rates.
  • Physical embodiment does not reduce phantom cost perceptions for robots, unlike the pattern observed with humans.
  • People apply the same social inference processes to robots as to humans when evaluating offers.
  • Decision making in human-robot interaction is influenced by attributions of hidden intentions to the robot.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Similar suspicion effects could appear in other AI gift or assistance scenarios, such as chatbots offering unexpected help or discounts.
  • Explaining the reason for a robot's generous offer in advance might reduce the phantom cost inference and raise acceptance.
  • The finding raises the question of whether repeated exposure to robots changes the strength of these intention inferences over time.
  • It connects to design choices in reward systems or loyalty programs delivered by automated agents.

Load-bearing premise

Lower acceptance of the cookie plus two dollars offer specifically reflects inference of bad intentions or phantom costs rather than alternatives such as general distrust of robots or preference for simpler transactions.

What would settle it

A replication in which acceptance rates for the cookie plus two dollars offer equal or exceed those for the cookie alone from robots, or in which the generosity effect vanishes after measuring and controlling for baseline robot distrust.

read the original abstract

A recent psychology study found that people sometimes reject overly generous offers from people because they imagine hidden ''phantom costs'' must be part of the transaction. Phantom costs occur when a person seems overly generous for no apparent reason. This study aims to explore whether people can imagine phantom costs when interacting with a robot. To this end, screen or physically embodied agents (human or robot) offered to people either a cookie or a cookie + \$2. Participants were then asked to make a choice whether they would accept or decline the offer. Results showed that people did perceive phantom costs in the offer + \$2 conditions when interacting with a human, but also with a robot, across both embodiment levels, leading to the characteristic behavioral effect that offering more money made people less likely to accept the offer. While people were more likely to accept offers from a robot than from a human, people more often accepted offers from humans when they were physically compared to screen embodied but were equally likely to accept the offer from a robot whether it was screen or physically embodied. This suggests that people can treat robots (and humans) as social agents with hidden intentions and knowledge, and that this influences their behavior toward them. This provides not only new insights on how people make decisions when interacting with a robot but also how robot embodiment impacts HRI research.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript extends a prior psychology finding on 'phantom costs' (inferred hidden costs in overly generous offers) to human-robot interaction. In an experiment, participants received offers of either a cookie or a cookie plus $2 from agents that were either human or robot and either screen- or physically embodied. The central result is that acceptance rates are lower for the cookie+$2 offer than the cookie-only offer for both human and robot agents (across embodiment levels), which the authors interpret as evidence that people infer bad intentions or phantom costs from robots. Secondary findings include higher overall acceptance from robots than humans, and an embodiment effect for humans but not robots.

Significance. If the core behavioral pattern holds after controls for alternative accounts, the work would demonstrate that people apply intention-inference mechanisms to robots in economic decision-making, extending social-cognition findings to HRI. The dissociation between embodiment effects for humans versus robots could inform design choices about physical presence. The study also supplies a direct behavioral test rather than relying solely on self-report.

major comments (2)
  1. [Abstract / Results] Abstract and Results section: the directional drop in acceptance for the cookie+$2 offer is reported, but the manuscript supplies no indication of design features (e.g., additional control conditions, process measures, or manipulation checks) that isolate inference of bad intentions from simpler alternatives such as general aversion to multi-part transactions or perceived oddity of the offer format. Without such isolation the observed pattern remains compatible with non-intention accounts.
  2. [Methods] Methods section: the abstract (and by extension the reported findings) supplies no sample size, exclusion criteria, statistical tests, or raw data summary, preventing evaluation of whether the data support the phantom-costs interpretation over noise or low power.
minor comments (1)
  1. [Abstract] The abstract states that 'people more often accepted offers from humans when they were physically compared to screen embodied' but does not report the corresponding statistical contrast or effect size.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their detailed and constructive comments. We address each major point below, providing clarifications on our design choices and committing to revisions that strengthen the reporting and discussion without misrepresenting the study.

read point-by-point responses
  1. Referee: [Abstract / Results] Abstract and Results section: the directional drop in acceptance for the cookie+$2 offer is reported, but the manuscript supplies no indication of design features (e.g., additional control conditions, process measures, or manipulation checks) that isolate inference of bad intentions from simpler alternatives such as general aversion to multi-part transactions or perceived oddity of the offer format. Without such isolation the observed pattern remains compatible with non-intention accounts.

    Authors: We agree that the current design does not include additional control conditions or process measures (such as intention ratings or checks for perceived oddity) to fully isolate phantom-cost inferences from alternatives like aversion to multi-part offers. The study closely replicates the offer structure from the original phantom-costs psychology work, and the lower acceptance for the cookie+$2 offer replicates across both human and robot agents, which is consistent with the intention-inference account. We will revise the Discussion to explicitly acknowledge these alternative explanations as a limitation and suggest future experiments with process measures. revision: partial

  2. Referee: [Methods] Methods section: the abstract (and by extension the reported findings) supplies no sample size, exclusion criteria, statistical tests, or raw data summary, preventing evaluation of whether the data support the phantom-costs interpretation over noise or low power.

    Authors: The full manuscript's Methods and Results sections contain the sample size, exclusion criteria, statistical tests, and acceptance rate summaries, but we acknowledge that these details are absent from the abstract. We will revise the abstract to include the sample size, key statistical results, exclusion criteria, and a brief data summary to allow proper evaluation of the findings. revision: yes

Circularity Check

0 steps flagged

Empirical behavioral study with no derivations or self-referential claims

full rationale

The paper reports results from a direct-choice experiment (accept/decline offers from human vs. robot agents in screen vs. physical embodiment). No equations, fitted parameters, model predictions, or derivation chains exist. The central observation (lower acceptance of cookie+$2 from robots) is presented as raw behavioral data, not as a quantity derived from or equivalent to any input by construction. External citation to a prior psychology study is not self-citation and does not bear the load of the robot-specific claim. The work is therefore self-contained with no circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Empirical study relying on standard social-psychology assumptions about intention inference; no free parameters, new entities, or ad-hoc axioms introduced beyond domain norms.

axioms (2)
  • domain assumption Participants interpret overly generous offers as potentially containing hidden costs or bad intentions
    Central to linking rejection behavior to phantom costs
  • domain assumption The experimental conditions isolate generosity as the causal factor
    Required to attribute acceptance differences to inferred intentions rather than other variables

pith-pipeline@v0.9.0 · 5769 in / 1242 out tokens · 23825 ms · 2026-05-24T02:43:43.673601+00:00 · methodology

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supports
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unclear
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Reference graph

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