＜Workshop on Search and Platform ご案内＞

日時：2024年10月29日（火）8:55-16:50
会場：CIGS会議室もしくは新丸ビルコンファレンススクエア　Room 901
（東京都千代田区丸の内1-5-1 新丸ビル 9F）
https://www.marunouchi.com/page/access/access_shinmaru/

参加費：無料
言語：英語 ≪同時通訳はありません≫

オーガナイザー：渡辺誠（京都大学経済研究所、CIGS 上席研究員）

プログラムのURL：こちらをご参照ください。

＜登録方法＞
参加希望の方は、以下の申込フォームからご登録ください。（締切：10月17日）
https://forms.gle/NGCjz68StjaQUAe87

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南幸子
一般財団法人キヤノングローバル戦略研究所
〒100-6511　東京都千代田区丸の内1-5-1
　　　　　　　　 新丸の内ビルディング11F
TEL:03-6213-0550　FAX:03-3217-1251
minami.sachiko@canon-igs.org

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<The Workshop on Search and Platform>
Date：2024, October 29th（Tuesday）8:55-16:50
Location: CIGS meeting room or Shin-Marunouchi Building Room 901, SHIN-MARU CONFERENCE SQUARE, 9th Floor
(1-5-1 Marunouchi, Chiyoda-ku, Tokyo)
https://www.marunouchi.com/en/building/shinmaru/information-access/

Participation Fee：Free
Capacity: 35 participants *The registration will be closed if we receive too many applications.
Organizer: Makoto Watanabe (CIGS senior researcher)

Link：https://drive.google.com/file/d/1iqb9wUNZ6JFcIOyg8zd-anuWSbv_NxkL/view

<How to register>
If you wish to participate in this conference, please register through the following application form. (Application Deadline: October 17)
https://forms.gle/NGCjz68StjaQUAe87

After your registration is complete, you will receive an auto-reply from the form.
If you do not receive the email, please check your spam mail folder.
If you want to change some items after your registration, please email us with the detailed information.

[CIGS Secretariat] (Reception hours: 9:00-17:30 on weekdays)
TEL: +81-3-6213-0550 (Representative)
Mail: minami.sachiko@canon-igs.org

【論文】（10/09更新）

要旨：This paper investigates the elusive role of productivity heterogeneity in new trade models in the trade and environment nexus. We contrast the Eaton-Kortum and the Melitz models with firm heterogeneity to the Armington and Krugman models without heterogeneity. We show that if firms have a constant emission share in terms of sales — as they do in a wide range of trade and environment models — the three models’ emission predictions exactly coincide. Conversely, if firms have a constant emission intensity per quantity — a prominent alternative in the literature — the emission equivalence between the three models breaks. We provide a generalization that nests both constant emission shares in sales and constant quantity emission intensities as special cases. We calibrate the models to global production and trade data and use German firm-level data to estimate the key elasticity of how emission intensity changes with productivity. Our multi-industry quantification demonstrates that the role of firm heterogeneity depends both on the model and the estimated parameters. Moving from the Armington model to the EK model increases the emissions effect on trade, while moving from the Krugman model to the Melitz model decreases the emission effects on trade.

座長練習者：関口 格（京都大学）

1700-1730 “Herding in Equity-Based Crowd Funding” 松下 旦 (京都大学)

1730-1800 “Facilitating trust and trustworthiness: The impact of mediation” 千葉 早織 (京都産業大学)

Title: Structural Change in Production Networks and Economic Growth

Abstract：We study structural change in production networks for intermediate inputs (input-output network) and new capital (investment network). For each network, we document that the share of output produced by goods sectors has declined since the 1950s, offset by a rising fraction of production by services sectors. We develop a multi-sector growth model to study these trends and show that our framework admits an aggregate balanced growth path with such structural change. Calibrating the model using disaggregated expenditure-side price data for the United States, we find that inputs to intermediates production are complements. However, in contrast to existing literature, we find that inputs to investment production are substitutes. Hence, structural change in production networks implies that resources endogenously reallocate to the slowest growing intermediates producers and the fastest growing investment producers. As a result, we show that investment-specific technical change accounts for an increasing share of U.S. aggregate growth, rising from 30-40% of growth prior to the 1980s to more than 70% since the year 2000. In addition, more than 20% of aggregate growth after 2000 stems from endogenous reallocation induced by structural change. At the same time, productivity growth within the input-output network has stagnated, accounting for the bulk of the recent slowdown in aggregate growth.