1. Intro
Arrow’s impossibility theorem:
- No voting system can perfectly translate individual preference into a collective decision that seems reasonable
Properties
- No matter how rank, the system should process
- No one could dictate the entire group result
- If an option is universally preferred, it wins
- Ranking between any two options depend only on the these two
2. Solution
- Relaxing Criteria
- Different voting system
- Ranked choice voting
- Borda count
- Approval voting