経済学部学会研究会について
法政大学経済学部学会では定期的に研究会を開催しています。
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開催予定および最近開催した研究会
【2026年度 第4回開催】日時：2026年12月04日（金）15:30～17:00（予定）
| 場所 | ハイブリッド開催（市ヶ谷キャンパス ボアソナードタワー25階C会議室 およびZOOMによるオンライン） |
|---|---|
| 報告題目 | Blood is thicker than water: The value of parent-affiliate ties in international supply chains |
| 報告者 | 神事 直人 氏 所属：京都大学 |
| 使用言語 | 日本語 |
| 要旨 | This study explores the role of ownership ties between parent firms and their foreign affiliates within international supply chains. The analysis utilizes novel firm-level microdata constructed by merging Chinese customs records with data on Japanese parent-affiliate pairs. Using the 2011 Great East Japan Earthquake as an exogenous shock, we examine how firms' responses to supply chain disruptions vary depending on their ownership ties to the disaster-affected region. Specifically, our triple-difference estimations reveal that, in the wake of the disaster, Japanese affiliates in China increased their imports from Japan relative to other countries to a significantly greater extent than non-Japanese foreign affiliates did. This tendency is more pronounced for final and non-differentiated goods than for intermediate or differentiated products. These findings suggest that, distinct from the role of input specificity, parent-affiliate ties play a critical role in shaping the procurement behavior and resilience of foreign affiliates in international supply chains. We develop a simple model to explain the mechanism behind these empirical findings. |
| 研究会担当 | 坪田 建明, 倪 彬 |
| 照会先 | 坪田 建明（tsubota [at]hosei.ac.jp;[at]を@に変換して下さい） |
【2026年度 第5回開催】日時：2027年01月29日（金）15:30～17:00（予定）
| 場所 | ハイブリッド開催（市ヶ谷キャンパス ボアソナードタワー12階1204教室 およびZOOMによるオンライン |
|---|---|
| 報告題目 | Global pollution in air transportation markets when carriers have market power |
| 報告者 | 土居 直史 氏 所属：小樽商科大学 |
| 使用言語 | 日本語 |
| 要旨 | This paper studies the interaction between market power and global pollution in European air transportation markets. Using route-level panel data covering around 93,000 airline-route-year-quarter observations, we document that market power is substantial and has strengthened in recent years, particularly on concentrated, tourist, and hub routes. We then develop a theoretical duopoly model in which airlines choose airfares, flight frequencies, and emissions, showing that the optimal corrective policy for externalities depends critically on the strength of market power: a tax is needed when market power is weak, but a subsidy is needed when market power is strong, since airlines already restrict frequency below the efficient level. A structural demand-and-supply model estimated on the full European route network confirms this prediction empirically: the welfare-maximizing emissions tax is negative for most routes, implying that market-power distortions dominate climate-related externalities and that uniform, emissions-only aviation taxation is unlikely to be welfare-maximizing. |
| 研究会担当 | 坪田 建明, 倪 彬 |
| 照会先 | 坪田 建明（tsubota [at]hosei.ac.jp;[at]を@に変換して下さい） |
