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Optimal incentives to give
Last registered on May 26, 2020

Pre-Trial

Trial Information
General Information
Title
Optimal incentives to give
RCT ID
AEARCTR-0005918
Initial registration date
May 23, 2020
Last updated
May 26, 2020 5:04 PM EDT
Location(s)

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Request Information
Primary Investigator
Affiliation
Texas A&M University
Other Primary Investigator(s)
PI Affiliation
Texas A&M University
Additional Trial Information
Status
On going
Start date
2017-09-01
End date
2023-12-31
Secondary IDs
Abstract
We implement a field experiment to examine optimal incentives for charitable giving. The price of giving is varied by offering a fixed match if the donation meets a threshold amount (e.g. "give at least $25 and the charity receives a $25 match''). Different threshold matches are tested in the field with participating charities.
External Link(s)
Registration Citation
Citation
Castillo, Marco and Ragan Petrie. 2020. "Optimal incentives to give." AEA RCT Registry. May 26. https://doi.org/10.1257/rct.5918-1.0.
Experimental Details
Interventions
Intervention(s)
We implement a field experiment to examine optimal incentives for charitable giving. Potential donors are offered, via an email, a match incentive if they make a donation. The price of giving is varied by offering a fixed match if the donation meets a threshold amount (e.g. "give at least $25 and the charity receives a $25 match''). Different threshold matches are tested in the field with participating charities.
Intervention Start Date
2017-11-01
Intervention End Date
2017-11-28
Primary Outcomes
Primary Outcomes (end points)
donation rate, donation amount
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
We implement a field experiment to examine optimal incentives for charitable giving. Potential donors are offered, via an email, a match incentive if they make a donation. The price of giving is varied by offering a fixed match if the donation meets a threshold amount (e.g. "give at least $25 and the charity receives a $25 match''). Different threshold matches are tested in the field with participating charities.
Experimental Design Details
Not available
Randomization Method
randomization done in office by a computer
Randomization Unit
treatments randomized at the individual level within each participating charity.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
112,000 individuals
Sample size: planned number of observations
112,000 individuals
Sample size (or number of clusters) by treatment arms
Roughly 12,600 individuals in each of 6 treatments and control group, and 8,000 in each of 3 treatments.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Texas A&M University IRB
IRB Approval Date
2016-11-01
IRB Approval Number
IRB2016-0721M