Effect of Cash, Celebrities and Role Models on Vaccinations and inter-generational transmission of vaccine take-up: Experimental Evidence from Pakistan

Last registered on August 19, 2021


Trial Information

General Information

Effect of Cash, Celebrities and Role Models on Vaccinations and inter-generational transmission of vaccine take-up: Experimental Evidence from Pakistan
Initial registration date
August 16, 2021

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 19, 2021, 11:49 AM EDT

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



Primary Investigator

New Economic School Moscow

Other Primary Investigator(s)

PI Affiliation
Lahore School of Economics
PI Affiliation
Toulouse School of Economics

Additional Trial Information

In development
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Mass Vaccinations are crucial to fight global pandemics. The question, however, remains how to optimally encourage vaccinations amid high levels of vaccine hesitancy and resistance. We conduct a randomized control trial with teachers across Pakistan and study vaccination uptake using actual vaccination certifications and study our treatments impact on both on teachers and its intergenerational transmission of norms regulating vaccine take-up and trust in students. Specifically, we horse race cash payments, lottery cash prizes, messages from celebrity and role models to encourage vaccinations and investigate their impact on vaccine take-up and hesitancy. Linking survey responses to actual vaccinations via certificates allow us to obtain study both stated preference and revealed preference behavior regarding vaccine take-up.
External Link(s)

Registration Citation

Chen, Daniel , Sultan Mehmood and Shaheen Naseer. 2021. "Effect of Cash, Celebrities and Role Models on Vaccinations and inter-generational transmission of vaccine take-up: Experimental Evidence from Pakistan." AEA RCT Registry. August 19. https://doi.org/10.1257/rct.8084-1.0
Experimental Details


We have 5 treatment arms along with the sixth placebo group among 600 teachers across Pakistan. The first 100 teachers randomly receive an encouragement message from a prominent celebrity in Pakistan to get vaccinated for COVID-19. The second treatment arm receive a identical randomly assigned encouragement message from female role model. The encouragement messages to the treatment groups are kept identical. The third treatment arm receives an opportunity to win three cash prizes via a lottery if they get vaccinated. The fourth and fifth treatment arms receive cash transfers if they present proof of vaccination. The six arm receive a placebo lecture, unrelated to COVID-19 vaccinations.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
vaccination certificates, did you get vaccinated survey response, outcomes on perspective-taking and trust games, open a bank account,
Primary Outcomes (explanation)
outcomes on perspective-taking involve obtaining outcomes from theory of mind and reading the eyes in the mind tests.

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We randomly assign individual teachers across Pakistan (using list of teachers working with Progressive Education Network of Pakistan).
Experimental Design Details
Randomization Method
randomization by a computer in Stata.
Randomization Unit
Individual level randomization
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
600 teachers
Sample size: planned number of observations
600 teachers
Sample size (or number of clusters) by treatment arms
100 teachers per treatment arm
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
The MDE is 0.19 standard deviations with 100 clusters per treatment arm.

Institutional Review Boards (IRBs)

IRB Name
Lahore School of Economics
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