Intertemporal Donations with Sorting
Last registered on July 21, 2021

Pre-Trial

Trial Information
General Information
Title
Intertemporal Donations with Sorting
RCT ID
AEARCTR-0005652
Initial registration date
May 09, 2021
Last updated
July 21, 2021 4:17 AM EDT
Location(s)

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Primary Investigator
Affiliation
Lund University
Other Primary Investigator(s)
PI Affiliation
University of Cologne
Additional Trial Information
Status
In development
Start date
2021-05-10
End date
2022-12-31
Secondary IDs
Abstract
We conduct a longitudinal, intertemporal donation experiment (online) with subjects from a lab subject pool to estimate time-induced changes in the relative weights placed on the prosocial motives altruism, warm glow and social pressure.
External Link(s)
Registration Citation
Citation
Apffelstaedt, Arno and Marco Islam. 2021. "Intertemporal Donations with Sorting." AEA RCT Registry. July 21. https://doi.org/10.1257/rct.5652-1.1.
Experimental Details
Interventions
Intervention(s)
1. We vary the payment date of the donation.
2. We vary the framing of the decision.
3. We vary the external donation to the charity.
4. We vary whether subjects have the opportunity to opt out of having to make a decision.
Intervention Start Date
2021-05-10
Intervention End Date
2021-07-31
Primary Outcomes
Primary Outcomes (end points)
1. Donation amount (Gift)
2. Share of subjects opting out of having to make a decision (Sort-Out)
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Time preferences for money, emotions, norms, recall of past decisions
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
We conduct a longitudinal, intertemporal donation experiment (online) with subjects from a lab subject pool.
Experimental Design Details
Not available
Randomization Method
Treatments are randomized at the subject level using a random computer draw. We balance treatments across participation dates.
Randomization Unit
All treatments are randomized at the subject (individual) level.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
640-800 subjects
Sample size: planned number of observations
640-800 subjects
Sample size (or number of clusters) by treatment arms
80-100 subjects per (between-subject) treatment
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Ethics Committee of the Faculty of Business, Economics and Social Sciences, University of Cologne
IRB Approval Date
2020-04-06
IRB Approval Number
20006AA
IRB Name
Ethics Committee of the Faculty of Business, Economics and Social Sciences, University of Cologne
IRB Approval Date
2021-04-27
IRB Approval Number
20006AA-Extension
Analysis Plan

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