Theory & Experimental Design. Part II. FTT & Political Science. Two generations (although overlap time wise): First – testing equilibrium & non-equilibrium predictions of social choice theory Second – testing more applied models, typically with greater institutional (political) detail.
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Who will win this election? Not obvious.
If voters A, B, & C all voted for their most preferred choice
(truth telling), & we use majority rule, then a tie between x & z.
But is that what we would want as a society? Normatively?
Condorcet argued that most preferred choice is one who would
Defeat or tie all others in pairwise (binary) contests.
Who is the Condorcet winner?
Binary choice between x & y, A votes for x, B & C for y, y wins.
Binary choice between y & z, A & B for y, C for z, y wins.
y is the Condorcet winner.
Majority rule is definitely not “strategy proof” & in fact,
normatively we might prefer that voters “strategize”
& positively expect them to – Making Votes Count
Can voters manipulate this voting rule getting a
more preferred outcome
by misrepresenting their preferences?
Who is the Condorcet winner now?
Who would win? In this example C voters’ ranking would
be maximal, note similarity w/ dictatorship in this example
-- but rule not same as dictatorship.