选区制度如何影响政党格局？
How do district systems shape party systems?
单一选区多数制倾向放大两大党、不利于小党（杜瓦杰定律）；比例代表则降低门槛、容纳更多政党，但可能使组阁更分散；混合制介于两者之间。
Single-seat plurality tends to favor two big parties and penalize small ones (Duverger's law); proportional representation lowers barriers and admits more parties but can fragment coalitions; mixed systems sit in between.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Rein Taagepera & Matthew Shugart,《Seats and Votes》Yale University Press,1989
R. Taagepera and M. S. Shugart, Seats and Votes, Yale University Press, 1989
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2896980W：Seats and votes（按标题+作者/
#杜瓦杰定律 #政党
什么是“阿罗不可能定理”？
What is "Arrow's impossibility theorem"?
它证明在满足几项合理条件（如尊重个人偏好、不独裁）时，不存在一种投票规则能始终把个人偏好汇成一致的集体排序，说明集体决策总有难以兼顾的权衡。
It proves no voting rule can always turn individual preferences into a consistent social ordering while meeting sensible conditions (respecting preferences, no dictator), showing collective choice always involves trade-offs.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Arrow，《社会选择与个人价值》(1951)
Arrow, 'Social Choice and Individual Values' (1951)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL5103552W：Social choice and indiv
#阿罗定理 #集体选择
“多数决”和“比例代表制”有什么不同？
How do "majority rule" and "proportional representation" differ?
多数决（如单选区相对多数）按得票最多者胜，易形成两党；比例代表按得票比例分配席位，更能反映多元诉求，但政党可能较多。
Majority rule (e.g., single-seat plurality) lets the top vote-getter win, tending toward two parties; proportional representation allocates seats by vote share, better reflecting diversity but often yielding many parties.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Rein Taagepera & Matthew Shugart,《Seats and Votes》Yale University Press,1989
R. Taagepera and M. S. Shugart, Seats and Votes, Yale University Press, 1989
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2896980W：Seats and votes（按标题+作者/
#选举制度 #代表