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Do default nudges and financial incentives increase COVID-19 vaccine acceptance among university students?
Last registered on May 07, 2021

Pre-Trial

Trial Information
General Information
Title
Do default nudges and financial incentives increase COVID-19 vaccine acceptance among university students?
RCT ID
AEARCTR-0007647
Initial registration date
May 07, 2021
Last updated
May 07, 2021 3:44 PM EDT
Location(s)

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Primary Investigator
Affiliation
University of Wyoming
Other Primary Investigator(s)
PI Affiliation
University of Wyoming
PI Affiliation
University of Wyoming
PI Affiliation
University of Wyoming
PI Affiliation
University of Wyoming
Additional Trial Information
Status
In development
Start date
2021-05-07
End date
2021-08-01
Secondary IDs
Abstract
The goal of this study is to determine the effectiveness of default nudges, direct payments, and lottery payments in increasing vaccine acceptance. We will conduct a single survey where participants are exposed to one of two choice architecture treatments and then one of two financial incentive treatments. In the choice architecture treatments participants will either see a default nudge treatment, where they must opt out of taking the vaccine by cancelling a premade appointment, or an active choice treatment, where they can choose to take the COVID-19 vaccine by making an appointment or going to a walk-in clinic. Participants will then see a direct payment treatment or a lottery treatment. We will determine the proportion of the student population that would take the vaccine under these different hypothetical scenarios.
External Link(s)
Registration Citation
Citation
Ashworth, Madison et al. 2021. "Do default nudges and financial incentives increase COVID-19 vaccine acceptance among university students?." AEA RCT Registry. May 07. https://doi.org/10.1257/rct.7647-1.0.
Experimental Details
Interventions
Intervention(s)
We will conduct a single survey where participants are exposed to one of two choice architecture treatments and then one of two financial incentive treatments. In the choice architecture treatments participants will either see a default nudge treatment, where they must opt out of taking the vaccine by cancelling a premade appointment, or an active choice treatment, where they can choose to take the COVID-19 vaccine by making an appointment or going to a walk-in clinic. Participants will then see a direct payment treatment or a lottery treatment. We will determine the proportion of the student population that would take the vaccine under these different hypothetical scenarios.
Intervention Start Date
2021-05-07
Intervention End Date
2021-05-31
Primary Outcomes
Primary Outcomes (end points)
The proportion of students that indicate they will take a COVID-19 vaccine.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Participants will be randomized into one of two treatments which varies whether the vaccine choice is framed as a default/opt-out choice or an active choice. Participants will be asked how likely they are to take the COVID-19 vaccine when they return to campus. Then, participants will be randomized into one of two financial incentive treatments. In each of the financial incentive treatments, participants will be given a multiple price list that outlines different values of direct payments of Cowboy Cash or a lottery with different odds of receiving $300 worth of Cowboy Cash. Participants will be asked to indicate for 7 different payments/lotteries whether they would take the vaccine or not. Participants will then be asked about their reasons for accepting or declining the vaccine, if they have previously had COVID-19, their academic standing and living plans for Fall 2021, their beliefs about vaccines and trust in different information sources, and some demographic questions.
Experimental Design Details
Not available
Randomization Method
By a computer
Randomization Unit
Individual
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
0
Sample size: planned number of observations
1,200
Sample size (or number of clusters) by treatment arms
400 per choice treatment - 100 per incentive treatment
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
University of Wyoming Institutional Review Board
IRB Approval Date
2021-05-07
IRB Approval Number
N/A