cube law

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An empirical law relating to the outcome of two-party multiple constituency elections. It states that if the votes gained by the parties are in the ratio p to (1-p), then the numbers of constituencies won by the parties will be in the ratio p3 to (1-p)3. A slight majority of votes (e.g. p=55%) leads to a much larger imbalance in constituencies won, since 0.553/(0.553+0.453)=65%. In the United Kingdom the law worked well for many years, though more recently the imbalance has been less extreme.

Subjects: Probability and Statistics — Politics.

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