選舉制度影響政黨體系，是廣為人知的因果推論。依此邏輯，若以政黨體系為因，以選舉制度的變化為果，即產生內生性的選制變遷理論。然而，某些研究者仍認為選制變革起於和政黨體系無關的外生因素。本文主張，選制變遷是否受到政黨體系的影響，取決於選制的種類。第一，有利大黨的多數決選制如果始終未出現一黨過半，則國會屬於多黨制，有可能因為小黨組成多數聯盟而改採比例性選制。尤其當現狀為並立式單一選區兩票制時，可能因為小黨的議席多來自政黨名單，而比代表區域主義的多數決選制更容易導致..

It is well known that electoral system shapes party system. By this logic, an endogenous explanation for changes in electoral systems should treat party system as the cause and changes as the consequence, in sharp contrast with theories attributing changes to exogenous factors that are irrelevant to party system. This paper argues that whether changes in electoral system are caused by party system depend on the type of the electoral system. First, if a majority party never emerges from a majoritarian electoral system, minor p..

本文主要是補充論述日本新選舉制度與自民黨走向集權化的關係。既有研究指出，在新選舉制度下，日本自民黨的派閥勢力逐漸地瓦解，從政治過程的觀察中，同時顯示出自民黨派閥的影響力確實也在消退中。本文發現，自民黨在新選舉制度下，依然維持「現任者優先」的提名策略，而「現任者優先」卻具有默認既存派閥勢力的意味。就此而言，派閥勢力應該保有足夠的生存空間，又為何會在新選舉制度下逐漸消退呢 ? 本文擬從候選人在新選舉制度下的「趨中現象」、「政權公約」的黨中央主導、重複提名的設計與比例的提高，以及 「七十三歲屆..

The main purpose of this paper is to further elaborate on the relationship between Japan's new electoral system and augmentation of power in the LDP central committee. The existing studies pointed out that the newly-reformed electoral system in Japan leads to a gradual decline of factions within the LDP while the actual power of the LDP central committee was elevated. However, this paper argues that if LDP's nomination process in the new electoral system still complies with the principle of “incumbents first," which w..