日本民主黨於 2009 年的眾議院選舉中擊敗執政的自由民主黨，黨魁鳩山由紀夫於 9 月 16 日成為日本首相。由於民主黨在參議院未過半，為了維持國會穩定運作，鳩山首相選擇與社會民主黨、國民新黨組成聯合內閣。
Yukio Hatoyama, the chairman of the Democratic Party of Japan (DPJ), succeeded to the Prime Minister of Japan on 16 September 2009 after DPJ won the 2009 Japanese general election. In the election, DPJ acquired 308 out of a total of 480 seats in the House of Representatives of Japan, while the Liberal Democratic Party(LDP), the former ruling party only acquired 119 seats. However, Hatoyama was thus forced to form a coalition government with the Social Democratic Party and the People’s New Party in response to a situation where DPJ does not have a majority in the House of Councilors.
Hatoyama seemed to be unable to effectively manage the discrepancies and integrate different opinions in his government. It is suggested by many researchers and mass media that Hatoyama does not possess strong leadership, which may lead to the political chaos in his team. This research therefore employs the cases of the the Reexamining Postal Privatisation Bills and the Futenma deal to investigate the leadership and the decision-making mechanisms in Hatoyama’s government. It is found that the inefficiency of the ‘politician-led government’ decision-making model developed by DPJ might be the main reason of the political chaos.
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