Green Preferences and Domain Spillovers

Last registered on November 15, 2023


Trial Information

General Information

Green Preferences and Domain Spillovers
Initial registration date
November 03, 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
November 15, 2023, 12:57 PM EST

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


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Primary Investigator

University of California - Berkeley

Other Primary Investigator(s)

Additional Trial Information

In development
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
I conduct an experiment with UC Berkeley students and affiliates to test conditions under which experiences with one type of green technology impact beliefs and preferences towards other green technologies.

Participants are randomized into treated and control groups, where treated subjects are made to have a negative experience with green technology. Following treatment, subject beliefs on five classes of green technology are surveyed.

I also test whether treatment increased the amount subjects are willing to donate to one of three randomly chosen non-profits: a generalist non-environmental one, a generalist environmental one, and a specialized environmental one.

To limit potential demand effects, response data will be withheld from the researchers who directly interact with subjects while experiments are underway.
External Link(s)

Registration Citation

Larson, Thor. 2023. "Green Preferences and Domain Spillovers." AEA RCT Registry. November 15.
Experimental Details


Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
technology-specific green preferences, willingness to give.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Subject recruitment and check-in will be handled by Berkeley xLab staff and will be tested in cohorts of up
to 36 members. Upon arriving at the xLab, subjects will be provided with a consent form to sign.
Treatment then occurs.
Following this, subjects will take an ~20 minute survey on xLab-provided computers.
After completing the survey, subjects will be presented with a debrief form to explain the overall intentions of the research.
Finally, subjects will meet with xLab staff to receive payment by check.

Total participation time for subjects will be one session lasting less than one hour.
Experimental Design Details
Not available
Randomization Method
Cohort randomization done in office by a computer. Random numbers were generated for all cohorts; within each week, the upper half of cohort values were assigned to be treated. Individual-level randomization done procedurally by Qualtrics
Randomization Unit
Experimental session [principal treatment]. Treatments are randomized within-week to ensure each week has an equal number of treated and untreated sessions.
Individual level [charitable giving randomization]
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
12 experimental sessions ("cohorts") + 2 pre-test sessions. Assuming no change in methodology following pretests, pretest data will also be included.
Sample size: planned number of observations
Approx. 500 subjects
Sample size (or number of clusters) by treatment arms
216 subjects (6 cohorts) control, 216 subjects (6 cohorts) treated.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials

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Institutional Review Boards (IRBs)

IRB Name
UC Berkeley Committee for Protection of Human Subjects
IRB Approval Date
IRB Approval Number