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Field
Intervention (Public)
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Before
We set the following treatment conditions in the dictator game experiment:
- Private-Ingroup: An allocator is informed that a recipient belongs to the ingroup (a vaccinated individual in the vaccinated sample, or an unvaccinated individual in the unvaccinated sample). The allocator is also anonymous for the recipient.
- Private-Outgroup: An allocator is informed that a recipient belongs to the outgroup (an unvaccinated individual in the vaccinated sample, or a vaccinated individual in the unvaccinated sample). The allocator is also anonymous for the recipient.
- Public-Ingroup: An allocator is informed that a recipient belongs to the ingroup. The recipient is notified of the vaccination status of the allocator.
- Public-Outgroup: An allocator is informed that a recipient belongs to the outgroup. The recipient is notified of the vaccination status of the allocator.
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After
We set the following treatment conditions in the dictator game experiment:
- Private-Ingroup: An allocator is informed that a recipient belongs to the ingroup (a vaccinated individual in the vaccinated sample, or an unvaccinated individual in the unvaccinated sample). The allocator is anonymous for the recipient.
- Private-Outgroup: An allocator is informed that a recipient belongs to the outgroup (an unvaccinated individual in the vaccinated sample, or a vaccinated individual in the unvaccinated sample). The allocator is anonymous for the recipient.
- Public-Ingroup: An allocator is informed that a recipient belongs to the ingroup. The recipient is notified of the vaccination status of the allocator.
- Public-Outgroup: An allocator is informed that a recipient belongs to the outgroup. The recipient is notified of the vaccination status of the allocator.
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Field
Experimental Design (Public)
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Before
We conduct dictator game experiments in the following five conditions:
(I) Anonymous: A recipient is anonymous for an allocator. The allocator is also anonymous for the recipient.
(II) Private-Ingroup: An allocator is informed that a recipient belongs to the ingroup (a vaccinated individual in the vaccinated sample, or an unvaccinated individual in the unvaccinated sample). The allocator is also anonymous for the recipient.
(III) Private-Outgroup: An allocator is informed that a recipient belongs to the outgroup (an unvaccinated individual in the vaccinated sample, or a vaccinated individual in the unvaccinated sample). The allocator is also anonymous for the recipient.
(IV) Public-Ingroup: An allocator is informed that a recipient belongs to the ingroup. The recipient is notified of the vaccination status of the allocator.
(V) Public-Outgroup: An allocator is informed that a recipient belongs to the outgroup. The recipient is notified of the vaccination status of the allocator.
One subject participates in five dictator game experiments as an allocator. We randomly set the order of the above conditions to create eight groups in the vaccinated and unvaccinated samples, respectively. After we first present the dictator game in the Anonymous condition (I) in all the eight groups, we randomly set the order of the Private (II, III) and Public (IV, V) conditions. Then, within each of the Private and Public conditions, we randomly set the order of the ingroup conditions (II, IV) and outgroup conditions (III, V). Consequently, each of the vaccinated and unvaccinated samples have eight groups.
Furthermore, to address potential order effects caused by successive participation in the dictator games in the within-analysis, we create a control group where we present the anonymous dictator game (I) five times. Totally, each of the vaccinated and unvaccinated samples have nine groups, including the control group.
We explain more details in the attachment of the analysis plan.
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After
We conduct dictator game experiments in the following five conditions:
(I) Anonymous: A recipient is anonymous for an allocator. The allocator is also anonymous for the recipient.
(II) Private-Ingroup: An allocator is informed that a recipient belongs to the ingroup (a vaccinated individual in the vaccinated sample, or an unvaccinated individual in the unvaccinated sample). The allocator is anonymous for the recipient.
(III) Private-Outgroup: An allocator is informed that a recipient belongs to the outgroup (an unvaccinated individual in the vaccinated sample, or a vaccinated individual in the unvaccinated sample). The allocator is anonymous for the recipient.
(IV) Public-Ingroup: An allocator is informed that a recipient belongs to the ingroup. The recipient is notified of the vaccination status of the allocator.
(V) Public-Outgroup: An allocator is informed that a recipient belongs to the outgroup. The recipient is notified of the vaccination status of the allocator.
One subject participates in five dictator game experiments as an allocator. We randomly set the order of the above conditions to create eight groups in the vaccinated and unvaccinated samples, respectively. After we first present the dictator game in the Anonymous condition (I) in all the eight groups, we randomly set the order of the Private (II, III) and Public (IV, V) conditions. Then, within each of the Private and Public conditions, we randomly set the order of the ingroup conditions (II, IV) and outgroup conditions (III, V). Consequently, each of the vaccinated and unvaccinated samples have eight groups.
Furthermore, to address potential order effects caused by successive participation in the dictator games in the within-analysis, we create a control group where we present the anonymous dictator game (I) five times. Totally, each of the vaccinated and unvaccinated samples have nine groups, including the control group.
We explain more details in the attachment of the analysis plan.
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