How do single-member districts affect smaller political parties?

In political systems, single-member districts—often associated with "first-past-the-post" or "winner-take-all" mechanisms—significantly disadvantage smaller political parties.12

Because these systems award the entire representation of a constituency to the single candidate who receives the most votes, smaller parties that may garner substantial support across a region often fail to secure the plurality required to win a seat. Consequently, this structure tends to exclude smaller parties from the legislature and encourages the dominance of two major parties, as voters and candidates often view supporting smaller entities as a "losing strategy".132

In contrast, proportional representation systems are specifically designed to ensure that the composition of a legislative body reflects the overall distribution of public support for various parties. By using multimember constituencies, these systems allow smaller parties to gain representation proportionate to their electoral success, which generally fosters a multiparty system rather than the two-party dominance typically produced by single-member districts.32