[EM] Honest equal-rank/truncation?

Toby Pereira tdp201b at yahoo.co.uk
Sat Jun 18 06:43:03 PDT 2022

 As an aside, "Random Approval" is the single-winner version of COWPEA Lottery. https://electowiki.org/wiki/COWPEA_Lottery
    On Saturday, 18 June 2022, 14:29:44 BST, Kristofer Munsterhjelm <km_elmet at t-online.de> wrote:  
 A thought about how honest equal-rank might be defined. Earlier I've
said that a good way to define a honest ballot is to find a randomized
strategyproof system that induces it (e.g. Random Ballot for
single-mark, Random Pair for strict ranked, possibly some transformation
of Hay for VNM utility ballots).

How about this as a starting point?

"Random Approval": Voters provide Approval-style ballots. Choose a
ballot at random. If this ballot approves a single candidate, then elect
that candidate. Otherwise eliminate every non-approved candidate and
draw another ballot (without replacement). Ignore ballots only approving
eliminated candidates. If every ballot is visited, choose at random a
candidate from the winning set.

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