Isn’t this the fallacy of gray? I agree that the disadvantages of AV over Condorcet are entirely irrelevant on 5 May, but that’s not to say that a Condorcet system wouldn’t be clearly superior. The only advantage of AV is that people would find a transition to STV easier to understand.
It is, but I was pointing out that “AV has downsides” isn’t itself an argument.
Approval voting, of course, isn’t a Condorcet system either. In fact it can pick the Condorcet loser—even in a situation with a strong Nash equilibrium.
Approval voting, of course, isn’t a Condorcet system either. In fact it can pick the Condorcet loser—even in a situation with a strong Nash equilibrium.
Really? This isn’t obvious to me, and a quick attempt to construct a counterexample has failed and Google doesn’t turn anything up either. Could you give a hint about how to construct this?
I got the result from http://dimacs.rutgers.edu/Workshops/DecisionTheory2/laslier.pdf . This deals with the preferences of the voters as utility functions (in such a way that it’s not all that easy for me to turn it into “X voters want candidate Y”), but has at least one example that would elect the Condorcet winner with probability only 1/64 while the Condorcet loser would be elected with probability 31⁄64...
Makes sense, though we probably couldn’t have got that through a referendum. Any preferential system is preferable (to me) to a non-preferential system, though (barring trivially absurd cases of both, like a preferential system where the least-preferred candidate wins).
Isn’t this the fallacy of gray? I agree that the disadvantages of AV over Condorcet are entirely irrelevant on 5 May, but that’s not to say that a Condorcet system wouldn’t be clearly superior. The only advantage of AV is that people would find a transition to STV easier to understand.
It is, but I was pointing out that “AV has downsides” isn’t itself an argument. Approval voting, of course, isn’t a Condorcet system either. In fact it can pick the Condorcet loser—even in a situation with a strong Nash equilibrium.
Really? This isn’t obvious to me, and a quick attempt to construct a counterexample has failed and Google doesn’t turn anything up either. Could you give a hint about how to construct this?
I got the result from http://dimacs.rutgers.edu/Workshops/DecisionTheory2/laslier.pdf . This deals with the preferences of the voters as utility functions (in such a way that it’s not all that easy for me to turn it into “X voters want candidate Y”), but has at least one example that would elect the Condorcet winner with probability only 1/64 while the Condorcet loser would be elected with probability 31⁄64...
Sure; if it had been my choice I would have chosen Ranked Pairs.
Makes sense, though we probably couldn’t have got that through a referendum. Any preferential system is preferable (to me) to a non-preferential system, though (barring trivially absurd cases of both, like a preferential system where the least-preferred candidate wins).