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STV has been around since the 19th century, and in use in Australia and Ireland since 1918 and 1921 respectively. At no point have computers been involved.

Although it is simple to perform manually, the iterative nature of counting the votes, eliminating the least popular candidate and distributing their preferences can add extra time to arrive at a result in a tight race. In general, though, the margin between candidates and preference flows are predictable enough that it's rarely significant.

Doesn't STV have the problem of nonmonotonicity, where gaining votes can make a candidate lose?

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