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Whether you have studied Japanese politics for years or you are only a casual observer, you are bound to have heard of the "danger zone" for Japanese prime ministers. As media reports and analysts have suggested, this is the zone in which a prime minister is at risk of leaving office, and it begins when public approval falls below 30 percent. But is there really a danger zone, and if so, what does that really mean?

Public opinion can be a problematic measure, so it is one that many scholars and practitioners often dismiss. Even in Japan, polling is imprecise and varies across different media outlets. Generally, they each target only about 1,000 to 2,000 respondents in every poll — 0.001 percent of the population — and the mode of communication (e.g. landline versus cell phone) for contacting respondents can affect the polling sample. In short, one can hardly claim polls as conclusive facts about public sentiment.

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