This paper examines whether the differences in the political systems of the House of Councillors and the bicameral system affect the behavior of members in the form of questioning in committee hearings, using the budget review of the 208th Diet session (FY2022) as the subject of analysis. The five factors that affect the skillfulness of parliamentary questioning are the House of Councillors’ oversight function, the expertise of its members, differences in the electoral system, political ideology, and former careers. The Budget Committee of the House of Councillors uses a one-way method, which allows for efficient examination through a large number of short questioning sessions, which is considered useful in fulfilling the oversight function.
In this paper, lists, contrasts, puzzle solutions, negative naming, Quotations of others’ statements (reinforcing, contrasting, neither), metaphors (positive, negative, neither), and episodes were identified and counted as political rhetoric. The unit of analysis was each Question, which was asked 1696 times in the House of Representatives and 2104 times in the House of Councillors, for a total of 3800 times. The number of times political rhetoric was used and the number of times negative metaphors/quotations of the statements of others (contrasted) were used as dependent variables and were estimated using a negative binomial regression model (NB2).
The analysis revealed that members of the House of Representatives use more political rhetoric than those of the House of Councillors due to the one-way method adopted by the House of Councillors Budget Committee. The one-way method adopted by the Budget C ommittee of the House of Councillors was found to reduce the use of political rhetoric in order to maximize the limited questioning time. In terms of the fusion and division of power, it became clear that the differences in the electoral systems and screening methods of the House of Representatives and the House of Councillors caused differences in questioning. Members of the House of Councillors questioned in an attempt to exercise their oversight function, while members of the House of Representatives used political rhetoric to address their constituents.
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