Abstract
Political scientists have not paid sufficient attention to the driving forces of ruling party stability, although other areas of political stability, such as democratic stability, leadership stability and cabinet stability have been studied extensively. This research fills a significant gap. It focuses on electoral rules and political party systems to explain ruling party durability. It demonstrates the following: (1) ruling parties’ hazard rates under the first-past-the-post systems are initially lower than those under proportional representation rules, but this tendency reverses over time, and (2) ruling parties’ hazard rates under two-party systems are initially lower than those under multiparty systems, but this too reverses.
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