AEA RCT Registry

Fields Changed

Registration

Field	Before	After
Trial Start Date	July 04, 2022	August 03, 2022
Trial End Date	August 31, 2023	August 31, 2024
Last Published	July 12, 2022 01:53 PM	August 02, 2022 07:16 PM
Intervention Start Date	July 04, 2022	August 03, 2022
Intervention End Date	August 14, 2022	September 30, 2022
Primary Outcomes (Explanation)	Revised donation WTP is larger than GBP15	Donation share on a scale from 0 - 100.
Experimental Design (Public)	Participants first state how much they are willing to pay for a donation. They then participate in a trust game. In the third stage, participants play a modified trust game where the second mover has the chance to signal their trustworthiness to the first mover by making a moral decision. The experiment exogenously varies what the first mover knows about the second mover's initial donation choice. In the Baseline treatment, participants give answers to all three stages of the experiment on the same day (in one session) Treatment A introduces a two week time delay between the donation stage and the two trust games. That is, there are two sessions: In session 1, participants only make the donation choice. In session 2, participants take part in the trust game and the modified trust game. Session 2 takes place two weeks after session 1. Treatment B introduces a two week delay between the first and second trust game. That is, there are two sessions: in session 1, participants make the donation choice and participate in the trust game. In session 2, participants take part in the modified trust game. Session 2 takes place two weeks after session 1.	Participants first state what share of a budget they want to allocate to a charity A. They then decide what share of a budget they want to allocate to a charity B. In the third task, participants play a modified sender-receiver game where the receiver has to estimate sender's donation share to charity B. The sender can send information to the receiver before the receiver makes the estimate. Incentives between sender and receiver are misaligned. In the Baseline treatment, participants give answers to all three stages of the experiment on the same day (in one session). In addition, the receiver receives a signal about the sender's charity A decision before reporting an estimate in the sender-receiver game. In Treatment A receivers do not receive a signal about the sender's charity A decision before reporting an estimate. Treatment B introduces a two week time delay between the donation to charity A and the donation to charity B and the trust game. That is, there are two sessions: In session 1, participants only make the donation choice to charity A. In session 2, participants make the donation choice to charity B and participate in the sender-receiver game. Session 2 takes place two weeks after session 1. Treatment C introduces a two week delay between the donation to charity B and the sender-receiver game. That is, there are two sessions: in session 1, participants make the donation choices to charities A and B. In session 2, participants take part in the sender-receiver game. Session 2 takes place two weeks after session 1.
Randomization Method	Randomization will be implemented through the experimental software (otree). Participants click on a link to participate in the experiment and are then randomized into one of the three treatments.	Randomization will be implemented through the experimental software (otree). Participants click on a link to participate in the experiment and are then randomized into one of the four treatments.
Planned Number of Clusters	990 individuals	1040 individuals
Planned Number of Observations	990 individuals participate in total.	1040 individuals participate in total.
Sample size (or number of clusters) by treatment arms	990 individuals in total. For most comparisons, 75 individuals by realized signal value and treatment.	1040 individuals in total. For most comparisons, 200 individuals by treatment.
Secondary Outcomes (End Points)	Please refer to the attached pdf for details on variable definitions	Please refer to the attached pdf for details on variable definitions.