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.