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Intertemporal Donations with Sorting

Last registered on May 10, 2021
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Pre-Trial

Trial Information

General Information

Title
Intertemporal Donations with Sorting
RCT ID
AEARCTR-0005652
Initial registration date
May 09, 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
May 10, 2021, 11:42 AM EDT

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

Locations

Country
Germany
Region

Primary Investigator

Name
Marco Islam
Affiliation
Lund University
Contact Primary Investigator

Other Primary Investigator(s)

PI Name
Arno Apffelstaedt
PI Affiliation
University of Cologne
Contact Investigator

Additional Trial Information

Status
In development
Start date
2021-05-10
End date
2021-07-31
Keywords
Behavior, Lab, Other
Additional Keywords
Altruism, Time Discounting, Preferences
JEL code(s)
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. May 10. https://doi.org/10.1257/rct.5652-1.0
Sponsors & Partners
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)
Supporting Documents and Materials
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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