Although random sampling used for many surveys fails to cover large segments of the population, the procedure nonetheless offers insight into voting and consumption patterns.

虽然许多调查所用的随机取样不能覆盖大部分人口，但是这一过程使人们能更深刻地理解选举和消费的模式。

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Taking these two symmetries into account, it is possible to characterise all paradoxes for a three-candidate election under any voting procedure.

ECONOMIST: The mathematics of voting