midGame Theory
What is trigger strategy in repeated games?
Updated May 16, 2026
Short answer
A trigger strategy is a strategy where cooperation continues until a deviation occurs, after which punishment is triggered.
Deep explanation
Trigger strategies enforce cooperation in repeated games by threatening punishment after deviation. Variants include grim trigger (permanent punishment) and forgiving trigger strategies.
Real-world example
Used in trade agreements where violations trigger sanctions.
Common mistakes
- Assuming punishment is always permanent in all trigger strategies.
Follow-up questions
- What is grim trigger?
- What is forgiving strategy?