HackerTube / Video
Simulating alternate voting systems
Primer

Primer uses simulations to compare voting systems such as first-past-the-post, approval, ranked choice and others. It shows how each system behaves and can be manipulated, with links to further voting theory resources.
HN commenters link it to explain why plurality voting produces two-party systems and how ranked-choice voting suffers spoiler effects.
10 Hacker News mentions · 2020–2026