A theory of social norms II

Last registered on August 03, 2022


Trial Information

General Information

A theory of social norms II
Initial registration date
August 01, 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
August 03, 2022, 3:03 PM EDT

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


Primary Investigator

Sciences Po & Paris School of Economics

Other Primary Investigator(s)

PI Affiliation
Ca' Foscari University of Venice

Additional Trial Information

On going
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
In this paper, we aim to acquire a quantitative understanding of how individual decisions to take a particular action depend on the share taking that action in their immediate environment.
External Link(s)

Registration Citation

Rasooly, Itzhak and Roberto Rozzi. 2022. "A theory of social norms II." AEA RCT Registry. August 03. https://doi.org/10.1257/rct.9829-1.0
Experimental Details


Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Whether participants choose to turn on their camera.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
See below.
Experimental Design Details
The purpose of the experiment is to measure how individuals' willingness to turn their video camera on depends on the share of others who have turned their camera on in their immediate environment. The experimental design is as follows:
1. A experimental subject enters a virtual meeting room on Zoom and is greeted by four experimenters.
2. Unbeknownst to the subject, the number of the experimenters who have turned their camera on has been randomised (so there are five treatments, corresponding to 0/4 cameras on, 1/4 cameras on, 2/4 cameras on, 3/4 cameras on, and 4/4 cameras on).
3. An experimenter asks the subject for their age, and whether they would choose to split a hypothetical bonus payment with the next subject to join the experiment.
4. If the subject's camera is off, the experimenter checks whether their camera is working properly.
5. The subject leaves the Zoom room and the process repeats.
Randomization Method
Using Python.
Randomization Unit
See experimental design.
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
We will obtain at least 1,000 observations (hopefully about 1,200). The exact number depends on the number of participants who turn up to the experiment.
Sample size: planned number of observations
See experimental design.
Sample size (or number of clusters) by treatment arms
The sample will be split between 5 treatment groups.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
University of Oxford
IRB Approval Date
IRB Approval Number


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