Problems with Instant Runoff Voting. Why Approval is Better.

Submitted by katdopp on Sun, 05/23/2021 - 22:01

June 12, 2021.  WHY Rank Choice Voting [counted by the IRV method] IS UNSUITABLE AND AV IS NOT. By John Howard Wilhelm. If we want to move away from our increasingly dysfunctional political system, changing our voting system is a necessary, though not sufficient, condition for doing so.  In thinking about alternative voting systems there are two important considerations to take into account.  First, does a voting system have a strong tendency to elect the most representative candidate given voters' preferences?  And second, does it level the voting field for third-party and independent candidates?


Problems with Instant Runoff Voting, i.e., The Alternative Vote.  What is Ranked Choice Voting? - A Mayoral Election Example.  Instant Runoff Voting - Is it Democratic? An analysis of the Burlington, VT election. Instant Runoff Voting - False Majorities - Is IRV a Fairvote?

short article in the February 1982 issue of the Notices of the AMS [American Mathematical Society] (see p. 136),

The AMS Nomination Procedure is Vulnerable to "Truncation of Preferences" This paper includes a simple example to show how, in the IRV method of counting rank choice votes, raising a candidate from last to first place can cause that candidate to lose--just the opposite of what a voter would desire--contradicting Cohn's claim (and also a claim of the American Mathematical Society before it switched to approval voting in 1990).  Professor Steve Brams shows how ANY higher ranked choice can hurt the chances of a lower ranked choice to win. Specifically, Bram's paper shows that a 2nd rank choice can hurt your 3rd ranked choice and cause your least favorite candidate to win. In general, any rank choice can hurt the chances of any later ranked choice of winning.

The 2004 US Presidential Election