How many large parties are there, on average, in a country with single-member-district plurality system

Name: How many large parties are there, on average, in a country with single-member-district plurality system
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Question

Quizplus · Accepted Answer

In a single-member-district plurality system, only one candidate can win in each district. This tends to favor the two largest parties who can make a credible claim to be able to win in a majority of districts. Therefore, on average, there tend to be two large parties in such a system.

How Many Large Parties Are There, on Average, in a Country