[EM] How would Condorcet himself have solved his paradox?
Markus Schulze
markus.schulze at alumni.tu-berlin.de
Mon Apr 30 11:46:27 PDT 2012
Dear Remi,
in his "Essai sur l'application de l'analyse a la probabilite des
decisions rendues a la pluralite des voix" (Imprimerie Royale,
Paris, 1785), Condorcet gives two different formulations for his
election method.
On page LXVIII of the Preface of the Essai, he writes:
> From the considerations, we have just made, we get the general
> rule that in all those situations, in which we have to choose,
> we have to take successively all those propositions that have
> a plurality, beginning with those that have the largest,
> & to pronounce the result that is created by those first
> propositions, as soon as they create one, without considering
> the following less probable propositions.
On page 126 of the Essai, he writes:
> Create an opinion of those n*(n-1)/2 propositions which win
> most of the votes. If this opinion is one of the n*(n-1)*...*2
> possible, then consider as elected that subject to which this
> opinion agrees with its preference. If this opinion is one of
> the (2^(n*(n-1)/2))-n*(n-1)*...*2 impossible opinions, then
> eliminate of this impossible opinion successively those
> propositions that have a smaller plurality & accept the
> resulting opinion of the remaining propositions.
Markus Schulze
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