• mindbleach
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    4 months ago

    … it’s a concise illustration of the core problem.

    RCV only cares about top votes - it can easily eliminate compromise candidates, just because they’re less popular as a first choice. Consider the following much-more-plausible election:

    40% want A > B > C.
    35% want C > B > A.
    25% want B > C > A.

    FPTP says A wins with a plurality of 40%, because FPTP sucks.

    RCV says B is eliminated and C beats A. Even though everyone who wanted A > C would prefer B. And if A beat C, everyone who wanted C > A would also have preferred B.

    Ranked Pairs says A vs B is 40-60 for B, A vs C is 75-25 for C, and B vs C is 65-35 for B. The Condorcet winner is B. Why should it be anyone else?