Breaking round-robin ties

The USA women’s soccer team is advancing out of the preliminary round-robin stage of competition based on a “goal differential” tiebreaker used to differentiate teams with the same win-loss records. “The United States finished second in Group G on the strength of its plus-3 goal differential,” the Washington Post reports. I mention this here because a similar “vote differential” statistic is used to break ties among candidates in Round-Robin Voting. One reason for developing Round-Robin Voting as an electoral system is its straightforward comparison to round-robin competitions in sports. If the public can understand how a round-robin tournament works in the Olympics, the public can understand how round-robin competition would work in an election. The ability of the public to understand its own electoral system is an important feature of a democracy, including the public’s willingness to adopt the system in the first place. Obviously, there are other important criteria in making a choice among alternate electoral systems, including those directly relevant to how each system translates voter preferences into an overall winner entitled to govern in the name of the people. Still, as this year’s Olympics unfold, it’s a useful reminder that the idea of Round-Robin Voting should not be ruled out solely on the ground that it is too complicated for voters to understand.

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