We study how partisan alignment across levels of government affects coalition formation and government stability using a regression discontinuity design and a large dataset of Spanish municipal elections. We document a positive effect of alignment on both government formation and stability. Alignment increases the probability that the most-voted party appoints the mayor and decreases the probability that the government is unseated during the term. Aligned parties also obtain sizeable electoral gains in the next elections. We show that these findings are not the consequence of favoritism in the allocation of transfers towards aligned governments.

中文翻译：

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那是权力吗？政治联盟、政府组建和政府稳定

我们使用断点回归设计和西班牙市政选举的大型数据集来研究各级政府之间的党派联盟如何影响联盟的形成和政府的稳定性。我们记录了协调对政府组建和稳定的积极影响。结盟会增加得票最多的政党任命市长的可能性，并降低政府在任期内下台的可能性。结盟的政党也会在下次选举中获得可观的选举收益。我们表明，这些发现并不是在向结盟政府分配转移支付时偏袒的结果。