Fairness of the crowd

Last registered on September 08, 2022


Trial Information

General Information

Fairness of the crowd
Initial registration date
September 06, 2022

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 08, 2022, 11:27 AM EDT

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



Primary Investigator


Other Primary Investigator(s)

PI Affiliation

Additional Trial Information

In development
Start date
End date
Secondary IDs
Prior work
This trial is based on or builds upon one or more prior RCTs.
This paper studies social spillover effects in distributive decision making. In an online spectator experiment, subjects choose from a menu of alternative ways to distribute money between strangers. In a US sample, constructed to be representative of the general population with respect to age, sex and ethnicity, we test whether receiving information about the choices of a reference group influences the spectator’s decision in the current experimental setting. The reference group is a randomly drawn group of three other spectators from a previous experiment by Almås et al. (2020). Prior to treatment, we elicit subjects’ beliefs choices in the reference group.
External Link(s)

Registration Citation

Madland, Kjetil and Eirik André Strømland. 2022. "Fairness of the crowd." AEA RCT Registry. September 08. https://doi.org/10.1257/rct.10023-1.0
Experimental Details


Online experiment, recruiting stakeholders from MTurk (N=200), and impartial spectators from Prolific (N=1000). We use a sample stratified to be representative of the US population on age, sex and ethnicity.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
The probability of distributing bonus money equally between a pair of stakeholders
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Implemented inequality
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We use data from a previously conducted study by Almås et al. (2020) as an information treatment, achieving random variation in the information that our spectators get about what others have done in the same setting. We test how this information affects fairness preferences and redistribution.
Experimental Design Details
Randomization Method
Randomization done in Qualtrics
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
1000 spectators
200 stakeholders
Sample size: planned number of observations
1000 spectators 200 stakeholders
Sample size (or number of clusters) by treatment arms
Treatment arms for spectators are randomized from the data collected by Almås et al. (2020). Expected distribution:
x=0 for 100 spectators
x=1 for 350 spectators
x=2 for 400 spectators
x=3 for 150 spectators
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Minimum detectable effect: 0.13 (i.e. 13 percentage point difference between groups) given standard deviation of 1,5 and sample of 1000.

Institutional Review Boards (IRBs)

IRB Name
NHH Institutional Review Board
IRB Approval Date
IRB Approval Number
NHH-IRB 31/21
Analysis Plan

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Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials