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This is the same "Group project" you played over {{C.Economy_num_rounds}} rounds in the previous part. This time, you will play it with the Partner A ({{ ingroup_tier_label }}) and Partner B ({{ outgroup_tier_label }}).
You have {{ pgg2_commons }} ECs. Decide how many to invest in a common pool — any whole number from 0 to {{ pgg2_commons }} ECs.
Your earnings = ECs kept + (total pool × 1.5 ÷ 3)