# Difference between revisions of "Descending Acquiescing Coalitions"

From Electowiki

m (cat) |
(mentioned DAC's satisfaction of the Later-no-help criterion) |
||

Line 1: | Line 1: | ||

'''Descending Acquiescing Coalitions''' or '''DAC''' is a [[voting system]] devised by Douglas Woodall for ranked ballots. It is equivalent to [[Descending Solid Coalitions]], except that sets are scored not by the number of voters solidly committed to them, but by the number of voters ''acquiescing'' to them. A voter "acquiesces" to a set of candidates if he does not strictly prefer any candidate outside of the set to any candidate within the set. | '''Descending Acquiescing Coalitions''' or '''DAC''' is a [[voting system]] devised by Douglas Woodall for ranked ballots. It is equivalent to [[Descending Solid Coalitions]], except that sets are scored not by the number of voters solidly committed to them, but by the number of voters ''acquiescing'' to them. A voter "acquiesces" to a set of candidates if he does not strictly prefer any candidate outside of the set to any candidate within the set. | ||

− | Unlike DSC, DAC does not satisfy the [[Later-no-harm criterion]]. | + | Unlike DSC, DAC does not satisfy the [[Later-no-harm criterion]], but it does, unlike DSC, satisfy the [[Later-no-help criterion]]. |

When no voter uses equal rankings or truncation, then DSC and DAC give the same results. | When no voter uses equal rankings or truncation, then DSC and DAC give the same results. | ||

[[Category:Single-winner voting systems]] | [[Category:Single-winner voting systems]] |

## Revision as of 19:20, 9 October 2005

**Descending Acquiescing Coalitions** or **DAC** is a voting system devised by Douglas Woodall for ranked ballots. It is equivalent to Descending Solid Coalitions, except that sets are scored not by the number of voters solidly committed to them, but by the number of voters *acquiescing* to them. A voter "acquiesces" to a set of candidates if he does not strictly prefer any candidate outside of the set to any candidate within the set.

Unlike DSC, DAC does not satisfy the Later-no-harm criterion, but it does, unlike DSC, satisfy the Later-no-help criterion.

When no voter uses equal rankings or truncation, then DSC and DAC give the same results.