Answer:
Interindividual-intergroup discontinuity
Step-by-step explanation:
When the Sigma Alpha Mu (SAM) fraternity plays the Zeta Beta Tau (ZBT) fraternity in a baseball game, the brothers of the two groups are highly competitive and see each other as enemies. When the SAM and ZBT brothers work together for a charity fundraiser, they are more cooperative and work well together. The difference here represents interindividual-intergroup discontinuity.
The interindividual—intergroup discontinuity effect is the tendency in some settings for relations between groups to be more competitive, or less cooperative, than relations between individuals.