Research activity information

• Mar. 2023 電気通信普及財団, 第38回 電気通信普及財団賞 テレコム人文学・社会科学賞, Platform Information Transparency and Effects on Third-Party Suppliers and Offline Retailers

  角田侑史, 善如悠介


• 2022 神戸大学, 優秀若手研究者賞

  善如悠介


• Mar. 2015 神戸大学大学院経営学研究科, 伊賀隆賞, Studies on Compatibility and Innovation in Two-sided Markets

  ZENNYO Yusuke

  Others

• Incumbent repositioning against a quality (dis)advantaged entrant with spillover effects

  Morifumi Hirao, Yusuke Zennyo

  Last, Elsevier BV, Apr. 2025, Journal of Business Research, 192, 115313, English

  [Refereed]

  Scientific journal


• A Model of Mobile App and Ad Platform Markets

  Yusuke Zennyo

  Elsevier BV, Dec. 2024, International Journal of Industrial Organization, 97, 103117, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Product variety and design in the age of peer‐to‐peer sharing

  Yusuke Zennyo

  Abstract The rise of peer‐to‐peer (P2P) sharing, exemplified recently by increased car‐sharing and clothing‐sharing, has altered our consumption style. One can consume goods without owning them. In fact, the ownership of goods can be monetized through P2P rental markets. These changes are regarded as influencing various strategies of manufacturers of goods being shared. Specifically, this paper examines aspects of product variety and design. A stylized model is examined in which a manufacturing firm makes a product variety decision of whether to launch a niche product line in addition to an existing mass product line. Consumers are of two types, including average consumers, who value the niche product less than the mass product, and snob consumers, who evaluate the niche product highly. Results demonstrate that the existence of P2P sharing makes consumers' ownership decisions immaterial, which alleviates difficulties of cannibalization between mass and niche product lines and which therefore encourages firms to widen their product variety. Moreover, to address issues of product design, the model is extended to allow the firm to choose the degree of niche‐serving of the second product line endogenously. Results show that P2P sharing deters a firm from designing a niche for the second product line.

  Wiley, Nov. 2024, Journal of Economics & Management Strategy, 33(4) (4), 825 - 844, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Self-preferencing by platforms: A literature review

  Yuta Kittaka, Susumu Sato, Yusuke Zennyo

  Corresponding, Elsevier BV, Jun. 2023, Japan and the World Economy, 66, 101191, English

  [Refereed][Invited]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Welfare Effects of Socially Conscious Platforms in Two-Sided Markets

  Hayama Abe, Yusuke Zennyo

  Abstract This note presents a model of platform competition in a two-sided market, with one competing platform pursuing not only its own profit but also consumer surplus. We investigate how the presence of such a socially conscious platform affects market competition. Results indicate that greater emphasis as an objective put on consumer surplus by the socially conscious platform leads to higher market share. Creation of a larger network enhances the total benefits associated with indirect network externalities in the two-sided market. When the extent of indirect network externalities is sufficiently strong, increased network benefits can improve social welfare. By contrast, if indirect network externalities are weak, then the socially conscious platform might be detrimental to society.

  Corresponding, Walter de Gruyter GmbH, Jan. 2023, The B.E. Journal of Economic Analysis & Policy, 23(1) (1), 243 - 251, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Consumer rebates from e‐commerce platforms and multichannel management of third‐party sellers

  Aika Monden, Yusuke Zennyo

  Wiley, Oct. 2022, Managerial and Decision Economics, 43(7) (7), 3059 - 3071, English

  [Refereed]

  Scientific journal


• Platform Encroachment and Own‐Content Bias

  Yusuke Zennyo

  Wiley, Sep. 2022, The Journal of Industrial Economics, 70(3) (3), 684 - 710, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Retailer voluntary investment against a threat of manufacturer encroachment

  Jumpei Hamamura, Yusuke Zennyo

  Springer Science and Business Media LLC, Dec. 2021, Marketing Letters, 32(4) (4), 379 - 395, English

  [Refereed]

  Scientific journal


• Platform Information Transparency and Effects on Third‐Party Suppliers and Offline Retailers

  Yushi Tsunoda, Yusuke Zennyo

  Corresponding, Wiley, Nov. 2021, Production and Operations Management, 30(11) (11), 4219 - 4235, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Revenue‐Sharing Contracts under Demand Uncertainty in Shopping Center

  Aika Monden, Katsuyoshi Takashima, Yusuke Zennyo

  Wiley, Jun. 2021, Real Estate Economics, 49(2) (2), 556 - 573, English

  [Refereed]

  Scientific journal


• Duration of price promotion and product profit: An in-depth study based on point-of-sale data

  Zhen Li, Katsutoshi Yada, Yusuke Zennyo

  Elsevier BV, Jan. 2021, Journal of Retailing and Consumer Services, 58(102277) (102277), English

  [Refereed]

  Scientific journal


• Neutrality of buyer and seller commissions to auction house profit

  Toshihiro Tsuchihashi, Yusuke Zennyo

  Wiley, Aug. 2020, Managerial and Decision Economics, 42(1) (1), 209 - 218, English

  [Refereed]

  Scientific journal


• Platform Most-Favored-Customer Clauses and Investment Incentives

  Masayoshi Maruyama, Yusuke Zennyo

  May 2020, International Journal of Industrial Organization, 70(102617) (102617)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Freemium Competition Among Ad-Sponsored Platforms

  Yusuke Zennyo

  Lead, Mar. 2020, Information Economics and Policy, 50(100848) (100848), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Strategic Contracting and Hybrid Use of Agency and Wholesale Contracts in E-Commerce Platforms

  Yusuke Zennyo

  Lead, Feb. 2020, European Journal of Operational Research, 281(1) (1), 231 - 239, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Platform Market Competition with Endogenous Side Decisions

  Jay Pil Choi, Yusuke Zennyo

  This paper develops a framework to analyze platform competition in two‐sided markets in which agents endogenously decide on which side of a platform to join. We characterize the equilibrium pricing structure and perform a comparative statics analysis on how the distribution of agents’ preferences affects the platforms’ profits. We also show that the market equilibrium under pro

  Wiley, Jan. 2019, Journal of Economics & Management Strategy, 28(1) (1), 73 - 88, English

  [Refereed]

  Scientific journal


• Process Innovation, Application Compatibility, and Welfare

  Masayoshi Maruyama, Yusuke Zennyo

  Sep. 2017, Information Economics and Policy, 40, 1 - 12, English

  [Refereed]

  Scientific journal


• Corporate Social Responsibility and Strategic Relationships

  Yoshifumi Hino, Yusuke Zennyo

  Springer Verlag, Sep. 2017, International Review of Economics, 64(3) (3), 231 - 244, English

  [Refereed]

  Scientific journal


• Asymmetric Payoffs and Spatial Competition

  Yusuke Zennyo

  Springer New York LLC, Mar. 2017, Journal of Industry, Competition and Trade, 17(1) (1), 29 - 41, English

  [Refereed]

  Scientific journal


• Competition between Vertically Differentiated Platforms

  Yusuke Zennyo

  Springer New York LLC, Sep. 2016, Journal of Industry, Competition and Trade, 16(3) (3), 309 - 321, English

  [Refereed]

  Scientific journal


• Platform Selection by Software Developers: Theory and Evidence

  Masayoshi Maruyama, David Flath, Kazumitsu Minamikawa, Kenichi Ohkita, Yusuke Zennyo

  Dec. 2015, Journal of the Japanese and International Economies, 38, 282 - 303, English

  [Refereed]

  Scientific journal


• Application Compatibility and Affiliation in Two-Sided Markets

  Masayoshi Maruyama, Yusuke Zennyo

  May 2015, Economics Letters, 130, 39 - 42, English

  [Refereed]

  Scientific journal


• Compatibility and the Product Life Cycle in Two- Sided Markets

  Masayoshi Maruyama, Yusuke Zennyo

  We consider a case in which two competing suppliers of hardware devices and content each chooses whether to make its content compatible with the other's device. Our main result is that the outcome of these choices depends upon whether the firms' major source of profit lies in the sale of hardware devices or in royalties from the sale of content. If the hardware is the main source of profit then incompatibility is a dominant strategy. If royalties are the main source of profit then compatibility is the dominant strategy. Which of these situations attains is likely to change over the product life cycle. We add to the literature by showing the equilibrium structure of compatibility in a two-sided market.

  Jun. 2013, Review of Network Economics, 12(2) (2), 131 - 155, English

  [Refereed]

  Scientific journal


• A Note on the Desirability of Merger among Complements

  Masayoshi Maruyama, Kazumitsu Minamikawa, Yusuke Zennyo

  Mar. 2011, Journal of Industry, Competition and Trade, 11(1) (1), 57 - 65, English

  [Refereed]

  Scientific journal

• Heterogeneous Consumer Expectations and Monopoly Pricing for Durables with Network Externalities

  Keisuke Hattori, Yusuke Zennyo

  Nov. 2018, Munich Personal RePEc Archive, No. 89893

• プラットフォームとイノベーションをめぐる新たな競争政策の構築

  根岸哲・泉水文雄・和久井理子

  Contributor, 第15章 プラットフォームによる自己優遇の経済分析, 商事法務, Jul. 2023, ISBN: 9784785730376


• 経済論文の書き方 = The craft of economic research writing

  経済セミナー編集部

  Contributor, 第14章 応用理論で論文を書く --- 産業組織論のケース, 日本評論社, Sep. 2022, Japanese, ISBN: 9784535540422

• Should Platforms be Held Liable for Defective Third-Party Goods?

  Yusuke Zennyo

  Australian Conference of Economists, Jul. 2024, English

  [Invited]

  Oral presentation


• Cross-Market Platform Competition in Mobile App Economy

  Yusuke Zennyo

  Asia-Pacific Industrial Organization Conference, Dec. 2023, English

  Oral presentation


• Should Platforms be Held Liable for Defective Third-Party Goods?

  Yusuke Zennyo

  European Association for Research in Industrial Economics, Aug. 2023, English

  Oral presentation


• Cross-Market Platform Competition in Mobile App Economy

  Yusuke Zennyo

  Conference on the Opportunities and Challenges of the Digital Revolution, Mar. 2023, English

  Oral presentation


• Should Platforms be Held Liable for Defective Third-Party Goods?

  Yusuke Zennyo

  Asia-Pacific Industrial Organization Conference, Dec. 2022, English

  Oral presentation


• Do Agency Contracts Facilitate Upstream Collusion?

  Yusuke Zennyo

  European Association for Research in Industrial Economics, Aug. 2019, English

  Oral presentation


• Strategic Contracting and Supplier Encroachment Through an E-commerce Platform

  ZENNYO YUSUKE

  Japan Association for Applied Economics, Jun. 2019, English, Nanzan University, This paper considers a supplier’s encroachment strategy through an e-commerce platform. When the supplier sells goods through an online channel in addition to a traditional retailer, he or she should either select a conventional wholesale contract or an emerging agency contract. Under the agency contract, the supplier can directly set its retail price while sales revenues are s, Domestic conference

  Oral presentation


• Platform Most-Favored-Customer Clauses and Investment Incentives

  ZENNYO YUSUKE

  Asia-Pacific Industrial Organization Conference, Dec. 2018, English, Asia-Pacific Industrial Organization Society, Melbourne, This paper presents examination of the effects of platform most-favored-customer (PMFC) clauses on incentives for platforms to invest in demand-enhancing investments that might involve spillover effects. In a bilateral duopoly model incorporating competition between sellers and between platforms, we show that the presence of PMFC clause raises the platforms’ investment level an, International conference

  Oral presentation


• Platform Most-Favored-Customer Clauses and Investment Incentives

  ZENNYO Yusuke

  European Association for Research in Industrial Economics (EARIE), Sep. 2018, Japanese, Athens College, International conference

  Oral presentation


• Do Agency Contracts Facilitate Upstream Collusion?

  ZENNYO Yusuke

  日本応用経済学会, Jun. 2018, Japanese, 日本応用経済学会, 京都大学, Domestic conference

  Oral presentation


• Two-sided Platforms

  ZENNYO Yusuke

  日本応用経済学会, Jun. 2017, Japanese, 日本応用経済学会, 久留米大学, Domestic conference

  [Invited]

  Invited oral presentation


• Freemiums on Advertising Platforms

  ZENNYO Yusuke

  APIOC, Dec. 2016, English, Asia Pacific Industrial Organization Conference, The University of Melbourne, International conference

  Oral presentation


• Freemium on Advertising Platforms

  EARIE 43rd Annual Conference, Aug. 2016, Japanese, European Economic Association, Lisbon, Portugal, International conference

  Oral presentation


• Freemiums on Advertising Platforms

  ZENNYO Yusuke

  EARIE, Aug. 2016, English, European Association for Research in Industrial Economics, Nova School of Business and Economics, International conference

  Oral presentation


• Freemium on Advertising Platforms

  ZENNYO Yusuke

  日本応用経済学会 春季大会, Jun. 2016, Japanese, 広島大学, Domestic conference

  Oral presentation


• Process Innovation in Two-Sided Markets

  Masayoshi Maruyama

  WEAI 90th Annual Conference, Jul. 2015, English, Western Economic Association International, Waikiki, International conference

  Oral presentation


• Process Innovation in Two-Sided Markets

  ZENNYO Yusuke, Masayoshi Maruyama

  90th Annual Conference, Weastern Economics Association International,, Jul. 2015, English, Waikiki, International conference

  Oral presentation


• High Profitability of Low-Quality Firm in Two-Sided Markets

  ZENNYO Yusuke

  日本経済学会秋季大会, Oct. 2014, Japanese, 西南学院大学, Domestic conference

  Poster presentation


• High Profitability of Low-Quality Firm in Two-Sided Markets

  ZENNYO Yusuke

  日本応用経済学会 春季大会, Jun. 2014, Japanese, 徳島大学, Domestic conference

  Oral presentation


• Welfare Effects of Process Innovation in Two-Sided Markets: The Role of Compatibility Decisions

  ZENNYO Yusuke, MARUYAMA MASAYOSHI

  日本応用経済学会 秋季大会, Nov. 2013, Japanese, 法政大学, Domestic conference

  Oral presentation


• Compatibility and the Product Life Cycle in Two-Sided Markets

  ZENNYO Yusuke, MARUYAMA MASAYOSHI

  日本経済学会 秋季大会, Oct. 2012, Japanese, 九州産業大学, Domestic conference

  Oral presentation

• Designing next generation regulations to address multidimensional risks caused by the expansion of digital platforms

  池田 千鶴, 武田 邦宣, 寺田 麻佑, 中川 丈久, 善如 悠介, 行岡 睦彦, 得津 晶, 佐藤 進, 和久井 理子, 川濱 昇, 水野 倫理, 生貝 直人, 川島 富士雄, 井畑 陽平, 水谷 瑛嗣郎, 根岸 哲, 木下 昌彦, 泉水 文雄

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Kobe University, Apr. 2022 - Mar. 2027, Coinvestigator


• プラットフォームビジネスに適合した流通システムの形態に関する研究

  善如 悠介, 丸山 雅祥, 松井 建二, 田頭 拓己, 角田 侑史, 平尾 盛史, 水田 誠一郎

  日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, Apr. 2020 - Mar. 2025, Principal investigator

  令和3年度は、プラットフォームの理解を促進するための研究のみならず、それが既存のサプライチェーンへ及ぼす影響の解明の一歩になり得る研究を推進することができた。例えば、前者はプラットフォームが自社の製品を優遇する行為 (自己優遇) に着目したものであり、そのような行為がマーケットプレイス上でのサードパーティの売手の行動や、そこに参加する消費者の行動に与える影響を分析した。さらに、自己優遇行為を禁止するような政策がどのような帰結をもたらしうるかを明らかにすることで、競争政策への貢献を与えた。後者は、プラットフォームが自身の持つ需要情報をサードパーティの売手に共有するか否かを論じたものである。需要情報の共有は、売手のプラットフォーム内での行動だけでなく、既存のサプライチェーンにおける行動にも影響を与える。これらの広範な影響を包括的に考慮した上で、情報共有に関するプラットフォームのプライベートなインセンティブだけでなく、その他の利害関係者への影響も分析することができた。これらの研究成果は、すでに査読付きジャーナルに掲載および掲載確定している。また、これら以外にも、令和2年度から継続しているプロジェクトや令和3年度に新しくスタートしたプロジェクトもあるため、これらが今後査読付きジャーナルに掲載されるように努める。 加えて、シェアリングエコノミー型のプラットフォームの普及が、そこで取引される財の製造業者へ及ぼす影響に関する理論的分析にも着手することができた。これらの研究成果は、まだ論文としてまとめきれていないものからすでにワーキングペーパーとして公表したものまであるが、まだ査読付きジャーナルに掲載されるには至っていない。今後、様々な研究会・学会での報告を通して、査読付きジャーナル掲載に向けて投稿を進めていきたいと思っている。


• プラットフォームによるビッグデータの利用が流通システムに与える影響に関する研究

  善如 悠介

  日本学術振興会, 科学研究費助成事業, 国際共同研究加速基金(国際共同研究強化(A)), 神戸大学, 2023 - 2025, Principal investigator


• Research on Establishment of Statistics of Cashless Payment and its Impact on Economy

  FUJIWARA KENYA

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2019 - Mar. 2022, Coinvestigator

  In this project, regarding cashless payment, one of the government's KPIs (Key Performance Indicators), we ① developed various statistics and databases, and ② conducted theoretical and empirical research on the impact of cashless payment on the financial and economic system in terms of consumer behavior, impact on the store, impact on the payment platform, and impact on macroeconomic policy management. In order to evaluate the benefits and challenges of cashless society, it is important to accumulate basic statistics and data-based research.


• プラットフォームとイノベーションをめぐる新たな競争政策の構築

  根岸 哲

  科学研究費補助金／基盤研究(A), Apr. 2017 - Mar. 2022

  Competitive research funding


• 両面市場におけるイノベーションに関する理論的研究

  善如 悠介

  学術研究助成基金助成金／若手研究(B), Apr. 2016 - Mar. 2020, Principal investigator

  Competitive research funding


• システム製品の市場における排他的契約と競争構造に関する理論的・実証的研究

  神戸大学, 特別研究員奨励費, Apr. 2012 - Mar. 2015

  Competitive research funding