American Government / Gov 262 · Atom · ~20 seconds
Winner-Take-All and Duverger's Law
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to the StudyWalks catalog
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Single-member districts under plurality rule push toward two parties, because second place earns nothing — a regularity called Duverger's Law.
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A party that reliably finishes third collects zero seats, and its supporters eventually migrate.
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The two-party system is downstream of Gov 213's counting rule — change the rule, change the party math.