If you actually work through the game theory, you find that single-winner instant-runoff voting is nearly as vulnerable to Duverger’s Law of two-party dominatio

If you actually work through the game theory, you find that single-winner instant-runoff voting is nearly as vulnerable to Duverger’s Law of two-party domination as plurality voting. https://www.electionscience.org/voting-methods/runoff-election-the-limits-of-ranked-choice-voting/ https://www.electionscience.org/voting-methods/runoff-electi... There are much better single-winner systems available: see approval voting, score voting, and Condorcet voting. But if you want a legislature with proportional representation, you really need a system with multi-representative districts.