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Small-Scale Question Sunday for September 8, 2024

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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A question on voting. Ireland, where I live, uses the "single transferable vote" system. Irish people often favourably contrast it with the "first past the post" used in the UK. I was trying to explain the differences between the two to my girlfriend and illustrate the weaknesses of first past the post relative to STV. One weakness that jumps out even at a casual inspection is that first past the post massively incentivises tactical voting, which by extension likely gives a home advantage to incumbents. Are there any other significant weaknesses to first past the post? Conversely, are there any weaknesses to STV that make first past the post preferable?

There's a lot on this. First past the post isn't a very good system. See wikipedia on voting methods for an intro—there's a bunch of different desirable properties, only some of which are compatible.