Once a Competitor, Always a Competitor? (Study 2)

Last registered on September 15, 2025
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Pre-Trial

Trial Information

General Information

Title
Once a Competitor, Always a Competitor? (Study 2)
RCT ID
AEARCTR-0016774
Initial registration date
September 13, 2025

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
September 15, 2025, 9:45 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Locations

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Primary Investigator

Name
Adelson Teh
Affiliation
Cornell University
Contact Primary Investigator

Other Primary Investigator(s)

Additional Trial Information

Status
In development
Start date
2025-09-17
End date
2100-12-31
Keywords
Behavior, Lab
Additional Keywords
Social Preferences, Identity
JEL code(s)
C91, D90, D91
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Not suitable to reveal to public before trial/study is over. Please see pre-analysis plan.
External Link(s)

Registration Citation

Citation
Teh, Adelson. 2025. "Once a Competitor, Always a Competitor? (Study 2)." AEA RCT Registry. September 15. https://doi.org/10.1257/rct.16774-1.0
Sponsors & Partners
Experimental Details

Interventions

Intervention(s)
Not suitable to reveal to public before trial/study is over. Please see pre-analysis plan.
Intervention Start Date
2025-09-17
Intervention End Date
2100-12-31

Primary Outcomes

Primary Outcomes (end points)
The outcome variables will be the behaviour (i.e., decisions) participants make during the study. Details are not suitable to be made public before the trial/study is over -- please refer to pre-analysis plan.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
In this study, participants will go through different scenarios. These scenarios might require them to complete some tasks or to make some decisions. Their final payment will depend on their actions and decisions in these scenarios. Details are not suitable to be made public before the trial/study is over -- please refer to pre-analysis plan.
Experimental Design Details
Not available
Randomization Method
Randomisation will be done on Prolific's end -- participants will be recruited into the study (by Prolific) but they will not know which treatment group they will be in before starting/agreeing to be in the study.
Randomization Unit
Randomisation is done at the individual level and is the same as above.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
600 participants
Sample size: planned number of observations
600 participants
Sample size (or number of clusters) by treatment arms
200 in each of the three treatment groups
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Note: All power calculations in this section used a significance of 0.05, a power of 0.8, and means and standard deviations from a prior pilot (N = 32) (where applicable), and are conducted using STATA. The minimum detectable effect-sizes reported are for two-sample mean-comparison tests (t-test) and proportion-comparison tests (z-test) (whichever applica- ble). Difference of 0.14 (likelihood) between treatment groups in choosing a certain allocation option. Difference of 0.85 (number of decisions) between treatment groups for number of decisions consistent with some model of (social) preferences.
Supporting Documents and Materials
IRB

Institutional Review Boards (IRBs)

IRB Name
Cornell University Office of Research Integrity and Assurance
IRB Approval Date
2025-05-01
IRB Approval Number
IRB0149668
Analysis Plan

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