Fig. 2: Procedure of the online group decision-making version of the trust game.

Group version of the trust game closely resembles the individual version, with the key distinctions being a preliminary group formation stage and the determination of investment amount. Before the experiment commences, participants log into the system and submit details like their name initials in Pinyin. The experiment begins once all group members have logged in, with the system indicating their group number. Throughout the experiment, the initials of all group members are visible. For each trial, trustee’s initial capital is the average of the investment made by all group members. These features collectively establish a group decision-making context.