Critics of the “first past the post” electoral rule often complain that it is unfair. It seems unfair that (for example) in the 2019 UK general election the Scottish National Party won 7% of parliamentary seats with only 4% of votes cast across the country, while the Liberal Democrats won 2% of seats with 4% of votes.
So, which electoral system is the fairest of them all?
I submit that there is really no answer to this question, and we would do better to discard it.
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