Results and Analyses -------------------- **Sample description (after exclusions)** A total of 157 students (Time Pressure n=79; Forced Delay n=78) were recruited from the subject pool of the Behavioral Sciences Laboratory (BESLab) at Pompeu Fabra University. Participants were paid a show-up fee of 3.5 Euro and were tested in groups (group size ranged from 12 to 28 in multiples of 4). We used the provided Qualtrics script with four changes: (1) our study materials were translated into Spanish, (2) participants made their contributions in Euros with a maximum contribution for each participant of 2.5 Euro, (3) two of the questions that assess participants’ understanding of the public goods game, and that specifically ask participants which contributions would result in the maximum group and individual gains, used a 11-point scale instead of a 9-point scale, and (4) participants were asked to type the ID of the computer that they used to perform the study. In all other respects, we followed the official protocol. Neither the use of a longer scale in the two comprehension questions mentioned above nor the inclusion of the computer ID question were anticipated in our pre-registered plan; the longer scale was a side-effect of using Euros instead of Dollars; the closest approximation to a 9-point dollar scale from 0 cents to 400 cents in increments of 50 cents was a 11-point euro scale ranging from 0 cents to 250 cents in increments of 25 cents. The question asking the ID of participants’ computers had to be added because the Qualtrics script failed to detect the individual IP addresses of the computers used in the study. The computer IP addresses were necessary to determine the final payments for each participant. Since the IP addresses could not be obtained, we were forced to replace them with an alternative identifier: the computer ID question. **Results** Contrary to expectations, the average contribution of the Time Pressure condition (M = 110.38 cents, SD = 97.01) was not significantly higher than the average contribution of the Forced Delay condition (M = 124.41 cents, SD = 96.71; t(155) = 0.91, p = 0.366).