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The Madness of First Past the Post
Raymond Long's blog: 2015-Jun-18
Politics

The 2015 general election in the UK used the first past the post electoral system. The biggest-polling party, Conservative, gained more votes than in 2010. The second-polling party, Labour, increased its vote by even more than the Conservatives. The gap in votes between the top two parties narrowed.
You'd expect this to mean that both parties should gain seats. You'd expect that as the gap in votes between the top two parties had narrowed, the gap in seats should also narrow. That is, Labour should gain more seats than the Conservatives, while still leaving the Conservatives with the greatest number of seats.
But the effect was very different. In fact Labour lost seats, despite having had a greater vote increase than the Conservatives.
VotesSeats (out of 650)
Party20152010change20152010change
Conservative1133457610726614+607962331307+24
Labour93473048609527+737777232258-26
The traditional wisdom in the UK is that a first past the post electoral system is bad for small parties but good for big parties. This election result shows that big parties also suffer gross unfairness from this mad system.
Data sources:
http://www.bbc.co.uk/news/election/2015/results
http://news.bbc.co.uk/1/shared/election2010/results
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