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Electoral systems
Part of the Politics and Economics series

Comparison of electoral systems Social choice theory Mechanism design List (By country)
Single-winner methods Single vote-runoff methods Plurality (FPP) Two-round (US: Jungle primary) Partisan primary Alternative vote (US: Ranked-choice) Condorcet-IRV Condorcet methods Ranked pairs Schulze Minimax Kemeny–Young Nanson Condorcet-IRV Maximal lottery Positional voting First-preference plurality Borda count Anti-plurality voting Cardinal / graded methods Score voting Approval voting Majority judgment STAR voting Quadratic voting
Proportional representation Party-list List type Open list Closed list Localized list Spare vote Apportionment Highest averages Largest remainders National remnant Biproportional apportionment Single transferable vote (Quota methods) Hare STV (Gregory · Wright) Schulze STV CPO-STV Single non-transferable vote Single divisible vote Approval-based committee Thiele's method Phragmen's method Expanding approvals rule Method of equal shares Weighted and Fractional social choice Direct representation Interactive representation Liquid democracy Maximal lottery
Mixed systems By type of representation Winner-take-most Mixed-member proportional Non-compensatory mixed systems Parallel voting Majority bonus Compensatory mixed systems Additional member system Mixed single vote Scorporo Double simultaneous vote Mixed ballot transferable vote Alternative Vote Plus Dual-member proportional Rural–urban proportional
Voting system criteria Spoiler-resistance Condorcet criterion Smith independence Spoiler independence Clone independence Strategy-resistance No lesser evil voting IIA Later-no-harm Later-no-help Rational response Participation criterion Monotonicity criterion Reversal symmetry
Social and collective choice Impossibility theorems Arrow's theorem Impossibility of majority-rule Moulin's impossibility theorem Gibbard's theorem Fishburn's theorem Positive results Median voter theorem Condorcet's jury theorem May's theorem Campbell-Kelly theorem Harsanyi's utilitarian theorem Tournament sets Smith set Landau set Copeland set Split-cycle set Bipartisan set
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Approval voting is a single-winner electoral system in which voters mark all the candidates they support, instead of just choosing one. The candidate with the highest approval rating is elected.