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Social choice andelectoral systems
Social choice Mechanism design Comparative politics Comparison List (By country)
Single-winner methods Single vote –plurality methods First preference plurality (FPP) Two-round (US:Jungle primary) Partisan primary Instant-runoff UK: Alternative vote (AV) US: Ranked-choice (RCV) Party block voting Plurality block voting Condorcet methods Condorcet-IRV Round-robin voting Minimax Kemeny Schulze Ranked pairs Maximal lottery Positional voting Plurality (el.IRV) Borda count (el.Baldwin,Mdn.Bucklin) Antiplurality (el.Coombs) Cardinal voting Score voting Approval voting Majority judgment STAR voting
Proportional representation Party-list Apportionment Highest averages Largest remainders National remnant Biproportional List type Closed list Open list Panachage List-free PR Localized list Quota-remainder methods Single transferable vote (Hare,Droop) Schulze STV CPO-STV Quota Borda Approval-based committees Thiele's method Phragmen's method Expanding approvals rule Method of equal shares Fractional social choice Direct representation Interactive representation Liquid democracy Fractional approval voting Maximal lottery Random ballot Semi-proportional representation Cumulative SNTV Limited voting
Mixed systems By results of combination Mixed-member majoritarian Mixed-member proportional By mechanism of combination Non-compensatory Parallel (superposition) Coexistence Conditional Fusion (majority bonus) Compensatory Seat linkage system UK:'AMS' NZ:'MMP' Vote linkage system Negative vote transfer Mixed ballot Supermixed systems Dual-member proportional Rural–urban proportional Majority jackpot By ballot type Single vote Double simultaneous vote Dual-vote
Paradoxes and pathologies Spoiler effects Spoiler effect Cloning paradox Frustrated majorities paradox Center squeeze Pathological response Perverse response Best-is-worst paradox No-show paradox Multiple districts paradox Strategic voting Lesser evil voting Exaggeration Truncation Turkey-raising Wasted vote Paradoxes ofmajority rule Tyranny of the majority Discursive dilemma Conflicting majorities paradox
Social and collective choice Impossibility theorems Arrow's theorem Majority impossibility Moulin's impossibility theorem McKelvey–Schofield chaos theorem Gibbard's theorem Positive results Median voter theorem Condorcet's jury theorem May's theorem Condorcet dominance theorems Harsanyi's utilitarian theorem VCG mechanism Quadratic voting
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Double simultaneous vote (DSV) is a feature of someelectoral systems in which multiple offices – such as the president and members of alegislature – are elected through a single vote cast for a party. It can be combined with other electoral systems; inUruguay DSV is used to elect the president and members of theSenate andChamber of Representatives, with the presidential election also using thetwo-round system; if no party/presidential candidate receives a majority of the vote, a second round is held for the presidential election.^[1]

The initial republican constitutions of several countries in theCommonwealth of Nations, such asKenya,^[2]Guyana^[3] andZambia,^[4] provided for presidential elections by double simultaneous vote. Occasionally, as inTanganyika,^[5][6] a variant was used whereby the candidate who won a plurality ofconstituencies (as opposed to a plurality of votes) would be elected. Such systems have also been used inLatin America.^{[citation needed]}

• Straight-ticket voting

• Electoral systems

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