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Political Discrimination in a Polarized Society

Last registered on June 06, 2023

Pre-Trial

Trial Information

General Information

Title
Political Discrimination in a Polarized Society
RCT ID
AEARCTR-0011495
Initial registration date
May 28, 2023

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
June 06, 2023, 3:29 PM 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

Affiliation
The Hebrew University of Jerusalem

Other Primary Investigator(s)

Additional Trial Information

Status
In development
Start date
2023-05-29
End date
2024-09-30
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
The proposed project aims to study how political polarization manifests itself in the willingness of individuals to conduct economic transactions across vs. within the political divide.
The project will do so using a combination of a field experiment and a follow-up telephone survey. In the field experiment, the research team will post on a website for classified ads a large number of fictitious ads for used cars in different localities throughout the country. To signal the political orientation of the sellers, we will use bumper stickers to manipulate the photographs included in the ads. Specifically, using the stickers ads will be randomly assigned either: (a) a right-wing orientation; (b) a left-wing orientation; or (c) a neutral orientation (the ads in this “control” group will have no sticker). The research team will then collect for each ad several main outcome variables: the number of hits on the ad on the website, the number of incoming inquiries, and the number of unique phone numbers associated with these inquiries.
In the second step, the research team will use the telephone numbers included in the logs of incoming inquiries to contact all prospective buyers and solicit their participation in a survey. These prospective buyers will not be alerted to the fact that they took part in the field experiment. The survey's main goal is to collect information on buyers’ political orientations.
By comparing outcomes across the three types of ads (right-wing, left-wing, and neutral), the field experiment will reveal the direction and strength of political discrimination in this market. To shed light on the sources of discrimination, we will merge the results of the field experiment with data on the political orientation (and other characteristics) of the relevant localities and with the results of the follow-up survey and then study the association between patterns of discrimination and political orientation both at the locality level and at the individual level.
External Link(s)

Registration Citation

Citation
Zussman, Asaf. 2023. "Political Discrimination in a Polarized Society." AEA RCT Registry. June 06. https://doi.org/10.1257/rct.11495-1.0
Experimental Details

Interventions

Intervention(s)
The project uses a combination of a field experiment and a follow-up telephone survey.
In the field experiment, the research team will post on a website for classified ads a large number of fictitious ads for used cars in different localities throughout the country. To signal the political orientation of the sellers, we will use bumper stickers to manipulate the photographs included in the ads. Specifically, using the stickers ads will be randomly assigned either: (a) a right-wing orientation; (b) a left-wing orientation; or (c) a neutral orientation (the ads in this “control” group will have no sticker).
In the second step, the research team will use the telephone numbers included in the logs of incoming inquiries to contact all prospective buyers and solicit their participation in a survey. These prospective buyers will not be alerted to the fact that they took part in the field experiment. The survey's main goal is to collect information on buyers’ political orientations.
Intervention Start Date
2023-05-29
Intervention End Date
2023-12-29

Primary Outcomes

Primary Outcomes (end points)
The research team will collect for each ad several outcome variables: the number of hits on the ad on the website, the number of times the ad was saved by prospective buyers, the number of incoming inquiries (WhatsApp and SMS messages and phone calls), the number of unique phone numbers associated with these inquiries, and the number of incoming e-mails.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Tone of incoming messages
Secondary Outcomes (explanation)
Given sufficient information, we may be able to use methods like "sentiment analysis" to classify the emotional tone of incoming messages as either positive, negative, or neutral.

Experimental Design

Experimental Design
In the field experiment, the research team will post on a website for classified ads a large number of fictitious ads for used cars in different localities throughout the country. To signal the political orientation of the sellers, we will use bumper stickers to manipulate the photographs included in the ads. Specifically, using the stickers ads will be randomly assigned either: (a) a right-wing orientation; (b) a left-wing orientation; or (c) a neutral orientation (the ads in this “control” group will have no sticker).
Experimental Design Details
Not available
Randomization Method
Randomization was done in office by a computer.
Randomization Unit
The unit of randomization is the individual used car. As explained in the "Experimental Design (Hidden)" section above, randomization applies to the first round. In the second and third rounds, we will use the same car models but switch the assignment of political orientation
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
Overall, 120 used car models will be used in the experiment. Each will appear in three different versions: neutral, right-wing, and left-wing. Thus, in total, we will post 360 ads.
Sample size: planned number of observations
In total, we will have 360 observations.
Sample size (or number of clusters) by treatment arms
Overall, 120 ads will be in the "control group" (neutral political orientation), 120 in the "right-wing treatment group" , and 120 in the "left-wing treatment group".
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
The Hebrew University of Jerusalem: Faculty of Social Sciences Ethics Committee
IRB Approval Date
2023-05-09
IRB Approval Number
2023-09051