Arrow's Impossibility Theorem
Arrow got a Nobel prize for showing that if there are 3 or more choices, it is NOT possible to satisfy all 5 conditions of democracy using rank voting system:
- Unanimity
- No Dictators
- Unrestricted Domain
- Transitivity
- Independence of irrelevant alternatives
There are problems with the types of democracy practised by some "western" democracy:
- First Past the Post - winner takes all - can only vote for one
- Preferential voting - ranked-choice voting - order in preference more than one
- Condorcet -
reference: veritasium