Independence of irrelevant alternatives: Difference between revisions
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None of the [[Borda count]], [[Coombs' method]] or [[Instant-runoff voting]] meet either criterion. |
None of the [[Borda count]], [[Coombs' method]] or [[Instant-runoff voting]] meet either criterion. |
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An anecdote which illustrates a violation of this property has been attributed to Sidney Morgenbesser: |
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:After finishing dinner, Sidney Morgenbesser decides to order dessert. The waitress tells him he has two choices: apple pie and blueberry pie. Sidney orders the apple pie. After a few minutes the waitress returns and says that they also have cherry pie at which point Morgenbesser says "In that case I'll have the blueberry pie." |
:After finishing dinner, Sidney Morgenbesser decides to order dessert. The waitress tells him he has two choices: apple pie and blueberry pie. Sidney orders the apple pie. After a few minutes the waitress returns and says that they also have cherry pie at which point Morgenbesser says "In that case I'll have the blueberry pie." |
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Voting systems which are not independent of irrelevant alternatives suffer from [[strategic nomination]] considerations. |
Voting systems which are not independent of irrelevant alternatives suffer from [[strategic nomination]] considerations. |
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==See also== |
==See also== |
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* [[Spoiler effect]] |
* [[Spoiler effect]] |
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* [[List of democracy and elections-related topics]] |
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[[Category:Voting system criteria]] |
[[Category:Voting system criteria]] |
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