Dear Prolific Community,
I have a question regarding participant payment. We are designing an experiment which contains both a mandatory and an optional part. The idea is that participants get paid to complete a mandatory part and can then end the survey or continue for up to 10 minutes to generate a donation to a charity (which they can stop at any time).
My question is the following: Is it in line with Prolific’s fair pay policy to specify pay and duration of the study according to the mandatory part only if we clearly indicate in the instructions that after the mandatory part participants can either obtain the completion code or optionally continue for charitable purposes.
As I expect at least some participants to continue, the average reward per hour (which is calculated after completion of the study) will therefore probably be quite low, as those participants who voluntarily continue will push up the average time taken to complete the study.
I hope that this wouldn’t be an issue as measuring this additional charitable “effort” is the main goal of our study.