Sei Shishido
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announcement (1)
Article (6)
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Presentation (32)

Blog

Notes on research, presentations, and publications

I Have Released a Dedicated Editor for Writing Footnoted Papers in Markdown

Miscellany

I have released Genkōdai on GitHub, an editor I built for writing academic papers that makes footnoting easier while taking care never to let AI invent sources.

Sep 29, 2026
4 min

Recent Developments in Japanese Competition Law: Through the Lens of Innovation

Presentation

At the 2026 Korea-Japan Competition Law Academic Research Conference at Korea University, I presented a critical examination of Japanese competition law enforcement through the lens of innovation.

Sep 18, 2026
3 min

Rules, Standards and Observability under Japan’s Mobile Software Competition Act

Presentation

At the Monash Warwick Alliance Digital Regulation Workshop, I presented on the design of ex ante regulation, drawing on seven months of Japan’s smartphone act in operation.

Aug 14, 2026
3 min

Competition Policy in the Platform Era: At the Cutting Edge

Book

I contributed commentaries on the Google cases, mergers, and market studies to Competition Policy in the Platform Era (Yuhikaku).

Aug 1, 2026
1 min

This Site Has Moved to Quarto + GitHub Pages

announcement
infrastructure

A record of the move from Ameba Ownd to Quarto.

May 5, 2026
1 min

Main Developments in Competition Law and Policy 2025 – Japan

Commentary

Kluwer Competition Law Blog

Mar 1, 2026
1 min

Goals, Ideology, and the Interpretation of Competition Law

Article

Kosei Torihiki no.904 p.45

Feb 1, 2026
1 min

From Data Hunt to Data Vault: A Closed-Chain Solution for Antitrust Compliance

Presentation

At IICAH Hawaii 2026, I proposed using blockchain to shift antitrust investigations and remedy monitoring from after-the-fact evidence hunting to advance recording.

Jan 4, 2026
3 min

An Overview of the Major Developments in Japan’s Competition Law and Policy in 2025

Presentation

Invited to the 2025 Taiwan-Japan Economic Law Conference, I presented on the major developments in Japan’s competition law and policy in 2025.

Dec 26, 2025
1 min

Designing Remedies in Dynamic Markets: The District Court Decision of September 2, 2025 in United States v. Google LLC

Presentation

At the Shojihomu Antimonopoly Law Study Group, I presented on designing remedies in dynamic markets, based on the September 2, 2025 remedies decision in the U.S. Google (search) case.

Nov 1, 2025
1 min

Goals, Ideology, and the Interpretation of Competition Law

Article

CPRC Discussion Paper no.CPDP-102-J pp.1–31

Oct 24, 2025
1 min

A Case Holding that a Change in the Specifications of a Complementary Product Did Not Constitute an Unfair Trade Practice

Case note

Hogaku Seminar special issue, Sokuho Hanrei Kaisetsu no.37

Oct 1, 2025
1 min

Commentary on the MC Data Plus Case

Presentation

Invited to the Japan Competition Law Forum’s unilateral conduct study group, I gave a commentary on the MC Data Plus cease-and-desist order.

May 29, 2025
1 min

A Case Holding that a Change in the Specifications of a Complementary Product Did Not Constitute an Unfair Trade Practice

Commentary

Shin Hanrei Kaisetsu Watch (Economic Law) No.99

May 1, 2025
1 min

Main Developments in Competition Law and Policy 2024 – Japan

Commentary

Kluwer Competition Law Blog

Mar 1, 2025
1 min

Strategic Conduct Aimed at Excluding Competitors and Innovation

Article

My article appeared in the special feature “Innovation and Competition Policy” in the February issue (no.892) of Kosei Torihiki.

Feb 15, 2025
2 min

Antimonopoly Case Study Group (No. 78): A Case Holding that Restrictions by Fishery Cooperatives on Shipments outside the Cooperative System Constituted an Unfair Trade Practice

Case note

I wrote a case note in NBL on two cease-and-desist orders concerning restrictions on shipments outside the cooperative system imposed on nori producers.

Feb 15, 2025
1 min

[News from Japan] On Hosting the First National Forum for Economic Law Research at Law Faculties

Commentary

Kosei Torihiki’s January issue carries my column on hosting the first National Forum for Economic Law Research at Law Faculties.

Jan 15, 2025
1 min

Content Platforms and the Antimonopoly Act

Presentation

I presented on content platforms and the Antimonopoly Act at the Committee for Improving the Status of Performers.

Dec 3, 2024
1 min

Book Review: Eric A. Posner, How Antitrust Failed Workers

Commentary

I reviewed Eric Posner’s book for the Japanese Yearbook of International Economic Law.

Oct 15, 2024
1 min

Competition Law Dictionary

Commentary

My English commentary published earlier this year has been included in Concurrences’ book, Competition Law Dictionary.

Sep 20, 2024
1 min

A Case Holding that Restrictions by Fishery Cooperatives on Shipments outside the Cooperative System Constituted an Unfair Trade Practice

Presentation

Invited to the Antimonopoly Cases and Decisions Study Group, I presented on restrictions by fishery cooperatives on shipments outside the cooperative system.

Sep 13, 2024
1 min

Excluding Competitors by Restricting Dealings with Rival Firms: The Minami Airport Service Case (Tokyo High Court, January 25, 2023)

Case note

My commentary on the Tokyo High Court judgment in the Minami Airport Service case was published in the third edition of the Hyakusen casebook on economic law.

Aug 30, 2024
1 min

A Case Holding that a Change in the Specifications of Printer Ink Cartridges Did Not Constitute an Unfair Trade Practice

Case note

I wrote a case commentary on the Osaka District Court judgment in Ecorica v. Canon for Jurist’s Important Cases annual.

May 20, 2024
1 min

Predatory Innovation and the Antimonopoly Act

Presentation

I took part in the annual conference of the Japan Competition Law Forum, as a presenter and panelist in a session analyzing three printer cases.

Mar 22, 2024
3 min

Distribution agreement

Commentary

I wrote the commentary on “distribution agreement” for Concurrences’ Global Dictionary of Competition Law.

Mar 6, 2024
2 min

The Goals of Competition Law, Economic Welfare, and Ideology

Presentation

Invited by a University of Tokyo KAKENHI project, I presented on the goals of competition law, economic welfare, and ideology.

Jan 26, 2024
2 min

Interplay of the Japanese Anti-monopoly Act and Blockchain

Presentation

At the Seikei University Institute for Future Law, I presented on my NBL article on the Antimonopoly Act and blockchain.

Dec 21, 2023
2 min

How do we define illegal ‘self-preferencing’ under the Japanese Anti-monopoly Act?

Presentation

I presented on self-preferencing by digital platforms at ASCOLA Asia 2023, held at Kyoto University.

Dec 1, 2023
2 min

The Goals of Competition Law and Ideology

Presentation

I presented on the goals of competition law and ideology at the Advanced Competition Law Practice Study Group.

Oct 25, 2023
1 min

Interplay of the Japanese Anti-monopoly Act and Blockchain

Article

My article on the interplay between the Antimonopoly Act and blockchain appeared in NBL no.1252.

Oct 15, 2023
1 min

Research on the Place of the Concept of Economic Welfare and of Ideology in the Debate on the Goals of Competition Law (Final Report)

Presentation

As a CPRC visiting researcher, I gave the final report on the discussion paper I am writing at a CPRC workshop.

Oct 6, 2023
1 min

A Case Holding that Disadvantageous Treatment of Customers because of Their Dealings with a Competitor Constituted Private Monopolization

Case note

Hogaku Seminar special issue, Sokuho Hanrei Kaisetsu no.33 pp.271–274

Oct 1, 2023
1 min

Reconstructing the Concept of Exclusion in Private Monopolization

Article

My presentation at the 2022 conference of the Japan Association of Economic Law has been published as an article in the association’s annual journal.

Sep 2, 2023
2 min

Handy Research Gear on a Modest Budget (Under ¥100,000)

Miscellany

A younger researcher asked me in passing, so — partly as a hobby — I put together research equipment a law graduate student can assemble for under ¥100,000.

Aug 29, 2023
7 min

‘Self-Preferencing’ under the Japanese Anti-monopoly Act

Article

I published an article on self-preferencing under the Antimonopoly Act in Seikei Hogaku no.98, issued at the end of June 2023.

Jul 9, 2023
2 min

A Case Holding that Disadvantageous Treatment of Customers because of Their Dealings with a Competitor Constituted Private Monopolization

Case note

My case note on the Tokyo High Court judgment in the Minami Airport Service case was published in TKC’s Hanrei Kaisetsu Watch.

Jun 16, 2023
2 min

“New Exclusion” and the Antimonopoly Act

Presentation

I presented at the Tohoku Economic Law Study Group on the research behind the article I presented at the Kansai Economic Law Study Group.

Dec 14, 2022
1 min

Self-Preferencing by Digital Platforms and Competition Law

Presentation

At the Kansai Economic Law Study Group, I presented my research on self-preferencing by digital platforms.

Dec 3, 2022
1 min

The Goals of Competition Law, Economic Welfare, and Ideology

Presentation

At the JFTC’s CPRC, I reported on the progress of my research at an interim workshop.

Nov 25, 2022
1 min

Reconstructing the Concept of Exclusion in Private Monopolization

Presentation

I presented on my monograph at the 2022 annual conference of the Japan Association of Economic Law, held at Kyoto University.

Oct 22, 2022
1 min

Reconstructing the Concept of Exclusion in Private Monopolization

Presentation

As a rehearsal for my conference presentation, I presented on my monograph at the Kansai Economic Law Study Group.

Sep 3, 2022
1 min

Above Cost Predatory Pricing and Private Monopolization

Presentation

With a KDDI Foundation grant, I presented on the legality of above-cost price cuts at the ASCOLA 2022 conference in Porto.

Jul 2, 2022
3 min

The Background and Developments of FTC v. Facebook in the United States

Presentation

At the Shojihomu Antimonopoly Law Study Group, I presented on the U.S. Facebook case, focusing on the district court’s memorandum opinion of January 11, 2022.

Jun 4, 2022
1 min

U.S. and EU Antitrust Case Studies (No. 140): New Developments in the Regulation of Refusals to Deal in the EU — The Slovak Telekom Judgment of the Court of Justice

Case note

My case note on the Slovak Telekom judgment appeared in Kosei Torihiki no.858, published on April 15.

Apr 20, 2022
1 min

Reconstructing the Concept of Exclusion in Private Monopolization

Book

Reconstructing the Concept of Exclusion in Private Monopolization was released by Shojihomu on April 8.

Apr 8, 2022
1 min

[Announcement] My Monograph Is Now Available for Pre-order

Book

Reconstructing the Concept of Exclusion in Private Monopolization will be released on April 8, 2022.

Apr 2, 2022
1 min

A Case Finding Unlawful Tying against Compatible Products

Case note

My case note, recently published on TKC’s website, has been included in the April issue of Shin Hanrei Kaisetsu Watch.

Apr 1, 2022
1 min

A Case Finding Unlawful Tying against Compatible Products

Case note

My case note “A Case Finding Unlawful Tying against Compatible Products” was published in TKC’s Shin Hanrei Kaisetsu Watch.

Dec 17, 2021
1 min

A New EU Case on Margin Squeeze and Refusal to Deal — The Slovak Telekom Judgment of the Court of Justice

Case note

A piece of mine was published in International Business Law Executive Summary (IBLES).

Oct 15, 2021
1 min

A Case on the Maintenance and Expansion of Monopoly and Monopsony Power over Fighters by a Mixed Martial Arts Promoter (Le v. Zuffa LLC, 216 F. Supp. 3d 1154)

Case note

A piece of mine was published in International Business Law Executive Summary (IBLES).

Jul 1, 2021
1 min

New Developments in the Regulation of Refusals to Deal in the EU — The Slovak Telekom Judgment of the Court of Justice

Presentation

At the Shojihomu Antimonopoly Law Study Group, I presented on recent developments in EU refusal-to-deal law through the Slovak Telekom judgment.

Jun 5, 2021
1 min

The Basis and Challenges of Regulating Unilateral, Direct Refusals to Deal

Presentation

I presented my article on unilateral refusals to deal at the Tokyo Economic Law Study Group.

Apr 17, 2021
1 min

The Regulatory Basis for Unilateral Refusals to Deal in Japan

Peer-reviewed article

My article on unilateral refusals to deal appeared in Osaka Law Review vol.70 no.5, published on January 29.

Feb 3, 2021
1 min

Research on the Place of the Concept of Economic Welfare and of Ideology in the Debate on the Goals of Competition Law

Presentation

I presented a research plan workshop at the JFTC’s Competition Policy Research Center (CPRC).

Jan 29, 2021
1 min

Regulating Predatory Pricing as a Form of Private Monopolization in Japan (4)

Peer-reviewed article

The final installment of my series in Hogaku Ronso appeared in the June 2020 issue.

Jan 9, 2021
1 min

The Regulation of Exclusionary Private Monopolization and Economic Welfare

Presentation

I presented at the second meeting of the Contract and Equality Study Group.

Dec 13, 2020
1 min

The Basis and Challenges of Regulating Unilateral, Direct Refusals to Deal

Presentation

I presented at the Kansai Economic Law Study Group. An article of the same title will appear in Osaka Law Review vol.70 no.5.

Nov 7, 2020
1 min

A Case on the Maintenance and Expansion of Monopoly and Monopsony Power over Fighters by a Mixed Martial Arts Promoter (Le v. Zuffa LLC, 216 F. Supp. 3d 1154)

Presentation

At the Shojihomu Antimonopoly Law Study Group, I examined a U.S. case on monopolization and monopsonization related to labor market concentration.

Sep 5, 2020
1 min

Spirit Airlines Case: An Analysis of the Judgment of the Sixth Circuit

Case note

A piece based on my February presentation at the Shojihomu Antimonopoly Law Study Group was published in Kosei Torihiki.

Aug 14, 2020
1 min

Regulating Predatory Pricing as a Form of Private Monopolization in Japan (3)

Peer-reviewed article

The third installment of my four-part article in Hogaku Ronso has been published.

Jul 27, 2020
1 min

Regulating Predatory Pricing as a Form of Private Monopolization in Japan (1) (2)

Peer-reviewed article

My article on predatory pricing appeared in Hogaku Ronso vol.186 nos. 3 and 4.

Jul 4, 2020
1 min

The Role of Competition Law and Policy in Human Resources (Competition in Services Provided by Individuals)

Presentation

I presented at the 8th meeting of the International Economic Law and Policy Research Network.

Feb 22, 2020
1 min

A Case Accepting the Reasonableness of Expert Testimony Showing a Possibility of Recoupment through Prices above Average Variable Cost and Remanding the District Court Judgment — Spirit Airlines, Sixth Circuit

Presentation

At the Shojihomu Antimonopoly Law Study Group, I presented on a U.S. lower-court decision setting out a standard for predatory pricing after Brooke.

Feb 1, 2020
1 min

Revisiting the Regulation of Predatory Pricing

Presentation

I presented the research behind my Hogaku Ronso article in more detail at the Kansai Economic Law Study Group.

Dec 7, 2019
1 min

Regulating Predatory Pricing as a Form of Private Monopolization in Japan

Presentation

At the Tokyo Economic Law Study Group, I presented on an article of the same title, to be published in installments from December.

Nov 16, 2019
1 min

I Attended the Degree Conferment Ceremony

Miscellany

My doctoral oral examination is over, and I will complete the doctoral program. A few words on the last three years.

Mar 30, 2019
2 min

Reconstructing the Concept of Exclusion in Private Monopolization: Focusing on the Actor’s Intent

Doctoral dissertation

My doctoral oral examination is over, and I will complete the doctoral program.

Mar 24, 2019
1 min

Regulation of Selective Price Cuts under EU Competition Law: Post Danmark I

Case note

A case note based on my earlier presentation at the Antimonopoly Law Study Group was published in the August issue of Kosei Torihiki.

Oct 19, 2017
1 min

The Role of Intent for Identifying Exclusionary Conduct: A Comparative Analysis between the Japanese Antimonopoly Act and the U.S. Antitrust Law (2, final)

Peer-reviewed article

The second half of the article based on my master’s thesis, published last year.

Apr 13, 2017
1 min

A Case on Whether Selective Price Cuts Constitute an Exclusionary Abuse

Presentation

At the Antimonopoly Law Study Group of the Kyoto Comparative Law Center, I presented on the Post Danmark I case.

Dec 2, 2016
1 min

The Role of Intent for Identifying Exclusionary Conduct: A Comparative Analysis between the Japanese Antimonopoly Act and the U.S. Antitrust Law (1)

Peer-reviewed article

An article based on my master’s thesis research. There are many points I will need to revise as I keep studying.

Jul 24, 2016
1 min
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