====================================================================== SOURCE FILE: monotonicity_irv_before.yaml TABULATED FILE: monotonicity_irv_before_tabulated.txt ====================================================================== election_title: "Non-monotonicity (RCV-IRV) — part 1: baseline, X wins" scenario_description: |- Part 1 of the RCV-IRV monotonicity pair: 34 voters, X wins (Z is eliminated, Z's ballots transfer to X). This is the baseline for the paradox — in part 2 (monotonicity_irv_after.yaml) four voters RAISE X from second to first choice, change nothing else, and X LOSES. Keep both files side by side; the ballots differ only in those four voters. paradoxes: [non-monotonicity] voting_method: RCV_IRV # RCV-IRV — monotonicity demo (BEFORE: X wins) num_winners: 1 # Non-monotonicity demo, part 1 of 2 (see _after). Classic 3-candidate example. # 34 voters. Round 1: X 12, Y 12, Z 10 -> Z eliminated; Z>X transfers -> X 22. X WINS. # Then in the _after file, 4 voters RAISE X to first (X>Y) and X LOSES — the paradox. ballots: |- 12:X>Y 12:Y>Z 10:Z>X expected_winners: - X # file: monotonicity_irv_before.yaml ====================================================================== TABULATION RESULTS ====================================================================== --- RCV / Instant-Runoff Voting (single winner) --- Non-monotonicity (RCV-IRV) — part 1: baseline, X wins Tabulating 34 ballots (ranked ballots). ROUND 1 Candidate Votes Status ----------- ------- -------- Y 12 Hopeful X 12 Hopeful Z 10 Rejected FINAL RESULT Candidate Votes Status ----------- ------- -------- X 22 Elected Y 12 Rejected Z 0 Rejected Winner(s) — RCV / Instant-Runoff Voting (single winner) X --- Smith Set (the generalized Condorcet winner) --- The smallest group whose every member beats every candidate outside it — the honest answer to "who is even in contention?". Smith set (3 of 3): X, Y, Z Outside (0): — More than one member ⇒ NO Condorcet winner: the top of the tournament is a cycle, so the strongest "candidate" is a set, not a person. Which member of the set should win is exactly what Minimax / Ranked Pairs / Schulze disagree about — see 05_Ranked_Robin/01_Learn/cycle_resolution.md. RCV-IRV winner X is INSIDE the Smith set. ✓ Not guaranteed — RCV-IRV is not Smith-efficient — but it holds here. More: 07_Concepts/topics/smith_set.md