How did the children distribute money in the experiment "minimal group paradigm" conducted by Tajfel and his colleagues ?

By code number and group membership

In the experiment, the children distributed money between recipients based on code number and group membership. They were instructed to allocate money to other individuals solely based on their assigned code number and whether they belonged to the ingroup or the outgroup. This allowed researchers to examine whether there would be biased favoritism towards the ingroup or discrimination against the outgroup.