History
Instant runoff voting was devised in 1871 by American architect William Robert Ware, although it is, in effect, a special case of the single transferable vote system, which emerged independently in the 1850s. Unlike the single transferable vote in multi-seat elections, however, the only ballot transfers are from backers of candidates who have been eliminated.
The first known use of an IRV-like system in a governmental election was in 1893 in an election for the colonial government of Queensland, in Australia. The variant used for this election was a "contingent vote". IRV in its true form was first used in 1908 in a State election in Western Australia.
IRV was introduced nationally in Australia in 1918 after the Swan by-election, in response to the rise of the conservative Country Party, representing small farmers. The Country Party split the anti-Labor vote in conservative country areas, allowing Labor candidates to win on a minority vote. The conservative government of Billy Hughes introduced preferential voting as a means of allowing competition between the two conservative parties without putting seats at risk. It was first used at the Corangamite by-election on 14 December 1918. Thomas Hare and Andrew Inglis Clark had previously introduced it in the Tasmanian House of Assembly.
Read more about this topic: Instant-runoff Voting
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