Joost Rietveld
@gjrietveld.bsky.social
UCL School of Management. Posts about technology, strategy, innovation, platforms, big tech, video games. #platformpapers
What happens to ecosystem diversity and #platform match quality after a platform introduces paid #discovery tools (e.g., Apple's search result ads)? @kai-zzzzzz.bsky.social and co-authors share insights from #Goodreads introduction of paid book giveaways.
platformpapers.substack.com/p/the-price-...
platformpapers.substack.com/p/the-price-...
The Price of Platform Participation
Goodreads’ introduction of paid giveaways reveals how charging for discovery affects ecosystem diversity and match quality.
platformpapers.substack.com
November 20, 2025 at 1:00 PM
What happens to ecosystem diversity and #platform match quality after a platform introduces paid #discovery tools (e.g., Apple's search result ads)? @kai-zzzzzz.bsky.social and co-authors share insights from #Goodreads introduction of paid book giveaways.
platformpapers.substack.com/p/the-price-...
platformpapers.substack.com/p/the-price-...
Together with Enrico and Alessandro we did a video interview with @faculti.bsky.social covering our ASQ article studying CrossFit gyms responding to a scandal involving the organization's CEO. It nicely shows our different but complementary perspectives on the study.
How does the social fabric of a community determine whether local businesses take a stand—or stay silent—on national controversies? @enricoforti.bsky.social, @alessandropiazza.bsky.social, @gjrietveld.bsky.social, @setonhall.bsky.social, @ucl.ac.uk discusses: faculti.net/when-communi...
#economics
#economics
November 17, 2025 at 11:42 AM
Together with Enrico and Alessandro we did a video interview with @faculti.bsky.social covering our ASQ article studying CrossFit gyms responding to a scandal involving the organization's CEO. It nicely shows our different but complementary perspectives on the study.
What happens when a star player leaves the market? In 'normal' markets you'd expect remaining firms to increase their output and sales, but not so much in platform markets. In the latest #PlatformPapers, what happened to Twitch streamers when Ninja left for Mixer? open.substack.com/pub/platform...
Star Wars
Why Ninja's sudden defection to Mixer made Twitch streamers less productive
open.substack.com
October 7, 2025 at 9:10 AM
What happens when a star player leaves the market? In 'normal' markets you'd expect remaining firms to increase their output and sales, but not so much in platform markets. In the latest #PlatformPapers, what happened to Twitch streamers when Ninja left for Mixer? open.substack.com/pub/platform...
In the latest #PlatformPapers blog, @anilrdoshi.com discusses work on #blockbuster projects in the #crowdfunding industry. When a platform has a hit, it triggers additional entry. Entry rates are higher on #Indiegogo, but of higher quality on #Kickstarter. platformpapers.substack.com/p/blockbuste...
Blockbuster Projects Send Waves Hitting All Platforms
Successful crowdfunding projects spill over to competing platforms
platformpapers.substack.com
September 23, 2025 at 8:04 AM
In the latest #PlatformPapers blog, @anilrdoshi.com discusses work on #blockbuster projects in the #crowdfunding industry. When a platform has a hit, it triggers additional entry. Entry rates are higher on #Indiegogo, but of higher quality on #Kickstarter. platformpapers.substack.com/p/blockbuste...
#Blockchain based initiatives (e.g. industry platforms for data sharing) are technologically #decentralized, but often they are owned and exploited by just one or a few companies. Read about this decentralization paradox in the latest #PlatformPapers blog. platformpapers.substack.com/p/the-platfo...
The Platform Governance Paradox
Why industry blockchain platforms struggle with centralization and decentralization
platformpapers.substack.com
August 27, 2025 at 12:53 PM
#Blockchain based initiatives (e.g. industry platforms for data sharing) are technologically #decentralized, but often they are owned and exploited by just one or a few companies. Read about this decentralization paradox in the latest #PlatformPapers blog. platformpapers.substack.com/p/the-platfo...
Thousands of hotels are bringing a lawsuit against Booking.com. At the heart is Booking's "best price" clause. Such clauses can have myriad anticompetitive effects, seller collusion being one of them. Frank Schlutter explains on the #PlatformPapers blog. platformpapers.substack.com/p/the-impact...
The Impact of Platform Most-Favored Nation Clauses on Seller Competition
How platforms benefit when sellers collude on price
platformpapers.substack.com
August 7, 2025 at 11:57 AM
Thousands of hotels are bringing a lawsuit against Booking.com. At the heart is Booking's "best price" clause. Such clauses can have myriad anticompetitive effects, seller collusion being one of them. Frank Schlutter explains on the #PlatformPapers blog. platformpapers.substack.com/p/the-impact...
Reposted by Joost Rietveld
We are hiring at Rotman Strategy in the Fall. Apply here. jobs.utoronto.ca/job/Toronto-...
Assistant Professor - Strategic Management
Assistant Professor - Strategic Management
jobs.utoronto.ca
July 21, 2025 at 6:55 PM
We are hiring at Rotman Strategy in the Fall. Apply here. jobs.utoronto.ca/job/Toronto-...
Reposted by Joost Rietveld
🚨 Thrilled to share our #AOM2025 symposium w/ @aldona.bsky.social & Yongzhi (Alex) Wang on #competition & #regulation in #platforms.
📅 July 29th | 🕝 1:45PM–3:15PM | 📍 Bella Center
More here 👉 www.linkedin.com/posts/mostaj...
📅 July 29th | 🕝 1:45PM–3:15PM | 📍 Bella Center
More here 👉 www.linkedin.com/posts/mostaj...
July 13, 2025 at 5:18 AM
🚨 Thrilled to share our #AOM2025 symposium w/ @aldona.bsky.social & Yongzhi (Alex) Wang on #competition & #regulation in #platforms.
📅 July 29th | 🕝 1:45PM–3:15PM | 📍 Bella Center
More here 👉 www.linkedin.com/posts/mostaj...
📅 July 29th | 🕝 1:45PM–3:15PM | 📍 Bella Center
More here 👉 www.linkedin.com/posts/mostaj...
Reposted by Joost Rietveld
🚨Free data alert!! 🚨 Please share.
Large new dataset of Amazon product reviews, including full text and photos and product characteristics, with individual *reviews labeled as fake reviews*.
I believe this is the first publicly available data of this kind.
github.com/bretthollenb...
Large new dataset of Amazon product reviews, including full text and photos and product characteristics, with individual *reviews labeled as fake reviews*.
I believe this is the first publicly available data of this kind.
github.com/bretthollenb...
July 11, 2025 at 9:18 PM
🚨Free data alert!! 🚨 Please share.
Large new dataset of Amazon product reviews, including full text and photos and product characteristics, with individual *reviews labeled as fake reviews*.
I believe this is the first publicly available data of this kind.
github.com/bretthollenb...
Large new dataset of Amazon product reviews, including full text and photos and product characteristics, with individual *reviews labeled as fake reviews*.
I believe this is the first publicly available data of this kind.
github.com/bretthollenb...
Platform cooperatives are trying to make the sharing economy more equitable by competing against incumbents (e.g., Airbnb, Uber) from the margin. Read about how they try to do this in the latest #PlatformPapers blog here: platformpapers.substack.com/p/platform-c...
Platform Cooperatives Driving Change from the Margins
How to make the sharing economy more equitable
platformpapers.substack.com
May 21, 2025 at 12:43 PM
Platform cooperatives are trying to make the sharing economy more equitable by competing against incumbents (e.g., Airbnb, Uber) from the margin. Read about how they try to do this in the latest #PlatformPapers blog here: platformpapers.substack.com/p/platform-c...
Digital platforms can help fill institutional voids. In the latest #PlatformPapers blog Aparajita Agarwal and Valentina Assenova discuss research showing how M-Pesa's #mobilemoney platform acts as a steppingstone to #financialinclusion for the unbanked.
Mobile Money as a Steppingstone to Financial Inclusion
How Digital Multisided Platforms Fill Institutional Voids
platformpapers.substack.com
April 29, 2025 at 2:01 PM
Digital platforms can help fill institutional voids. In the latest #PlatformPapers blog Aparajita Agarwal and Valentina Assenova discuss research showing how M-Pesa's #mobilemoney platform acts as a steppingstone to #financialinclusion for the unbanked.
In the latest PlatformPapers blog, Ken Wilbur and Davide Proserpio discuss why #advertising is an emergent (but understudied) property of successful digital #platforms. A recommended read! platformpapers.substack.com/p/advertisin...
Advertising is an Emergent Property of Successful Platforms
Plus a public wager
platformpapers.substack.com
April 10, 2025 at 7:36 AM
In the latest PlatformPapers blog, Ken Wilbur and Davide Proserpio discuss why #advertising is an emergent (but understudied) property of successful digital #platforms. A recommended read! platformpapers.substack.com/p/advertisin...
Now in-press at Academy of Management Perspectives: Hypercontinuous Innovation and Demand-Side Learning: Why Digital Platforms Enjoy Longer and More Expansive Market Leadership Positions joint with Melissa Schilling. journals.aom.org/doi/abs/10.5...
Hypercontinuous Innovation and Demand-Side Learning: Why Digital Platforms Enjoy Longer and More Expansive Market Leadership Positions | Academy of Management Perspectives
Strategy and innovation scholars are increasingly concerned about the market power of successful digital platforms—and so are the authorities tasked with regulating the so-called Big Tech companies. T...
journals.aom.org
March 20, 2025 at 5:02 PM
Now in-press at Academy of Management Perspectives: Hypercontinuous Innovation and Demand-Side Learning: Why Digital Platforms Enjoy Longer and More Expansive Market Leadership Positions joint with Melissa Schilling. journals.aom.org/doi/abs/10.5...
Abnormal performance is a normal feature of many digital platform. Read about research in the context of #Udemy by Kaushik Gala, Andreas Schwab, and Brandon Mueller in the latest #platformpapers blog. platformpapers.substack.com/p/star-entre...
Star Entrepreneurs on Digital Platforms
Abnormal performance is normal in many platforms.
platformpapers.substack.com
March 18, 2025 at 2:00 PM
Abnormal performance is a normal feature of many digital platform. Read about research in the context of #Udemy by Kaushik Gala, Andreas Schwab, and Brandon Mueller in the latest #platformpapers blog. platformpapers.substack.com/p/star-entre...
In the latest #PlatformPapers blog, Paul Belleflamme, Eric Toulemonde and Martin Peitz argue that using market shares to proxy market power for digital platforms is complicated for several reasons. They offer insights to regulators, investors and managers.
platformpapers.substack.com/p/rethinking...
platformpapers.substack.com/p/rethinking...
Rethinking Market Power in the Digital Platform Era
Market share isn't everything.
platformpapers.substack.com
February 27, 2025 at 1:32 PM
In the latest #PlatformPapers blog, Paul Belleflamme, Eric Toulemonde and Martin Peitz argue that using market shares to proxy market power for digital platforms is complicated for several reasons. They offer insights to regulators, investors and managers.
platformpapers.substack.com/p/rethinking...
platformpapers.substack.com/p/rethinking...
In the latest #PlatformPapers blog Manav Raj explores the effects of adding competitors in digital platforms. In the context of #Spotify he finds that when a major artist releases an album, related artists see their listenership rise by up to 3% and their overall popularity increase by 1–2%.
Demand Spillovers in Digital Platforms
When it comes to adding competitors, can more be merrier?
platformpapers.substack.com
February 4, 2025 at 2:02 PM
In the latest #PlatformPapers blog Manav Raj explores the effects of adding competitors in digital platforms. In the context of #Spotify he finds that when a major artist releases an album, related artists see their listenership rise by up to 3% and their overall popularity increase by 1–2%.
New Platform Papers blog: Reputation Spillover in Digital Markets - When Agencies Help or Hurt Creators platformpapers.substack.com/p/reputation...
Reputation Spillover in Digital Markets
When agencies help or hurt creators
platformpapers.substack.com
January 14, 2025 at 2:03 PM
New Platform Papers blog: Reputation Spillover in Digital Markets - When Agencies Help or Hurt Creators platformpapers.substack.com/p/reputation...
New paper alert: Hypercontinuous Innovation and Demand-Side Learning: Why Digital Platforms Enjoy Longer and More Expansive Market Leadership Positions - joint with Melissa Schiling and forthcoming in SI on #platformregulation at Academy of Management Perspectives.
(PDF) Hypercontinuous Innovation and Demand-Side Learning: Why Digital Platforms Enjoy Longer and More Expansive Market Leadership Positions
PDF | Strategy and innovation scholars are increasingly concerned about the market power of successful digital platforms—and so are the authorities... | Find, read and cite all the research you need o...
www.researchgate.net
January 2, 2025 at 10:06 AM
New paper alert: Hypercontinuous Innovation and Demand-Side Learning: Why Digital Platforms Enjoy Longer and More Expansive Market Leadership Positions - joint with Melissa Schiling and forthcoming in SI on #platformregulation at Academy of Management Perspectives.
The 2024 Platform Papers Year in Review is here! What were the top journals for platform competition research? Which were the top-cited papers and the most-read #PlatformPapers blogs? Read all about it and more by following the link. Happy holidays!🎄🎅 platformpapers.substack.com/p/platform-p...
Platform Papers 2024 Year in Review
It’s that time of the year again. Time to look back and reflect.
platformpapers.substack.com
December 17, 2024 at 8:36 AM
The 2024 Platform Papers Year in Review is here! What were the top journals for platform competition research? Which were the top-cited papers and the most-read #PlatformPapers blogs? Read all about it and more by following the link. Happy holidays!🎄🎅 platformpapers.substack.com/p/platform-p...
What is the hidden cost of platform diversification? Read all about it in the latest Platform Papers blog, expertly written by David Chung, Maggie Zhou, and Christine Choi.
The Hidden Cost of Platform Diversification
When Uber eats its own business, and its competitors’ too
platformpapers.substack.com
November 28, 2024 at 8:20 AM
What is the hidden cost of platform diversification? Read all about it in the latest Platform Papers blog, expertly written by David Chung, Maggie Zhou, and Christine Choi.
When it comes to online dating platforms, is more merrier? ❤️ That's the question Jessica Fong tackles in the latest #platformpapers blog. Drawing from an #experiment conducted on a leading #onlinedating #platform she obtained some interesting findings.
platformpapers.substack.com/p/network-ef...
platformpapers.substack.com/p/network-ef...
Network effects in online dating
The more the merrier?
platformpapers.substack.com
June 25, 2024 at 11:34 AM
When it comes to online dating platforms, is more merrier? ❤️ That's the question Jessica Fong tackles in the latest #platformpapers blog. Drawing from an #experiment conducted on a leading #onlinedating #platform she obtained some interesting findings.
platformpapers.substack.com/p/network-ef...
platformpapers.substack.com/p/network-ef...
We often talk about needing to regulate powerful platforms, but such interventions can have unintended second-order effects. Read the latest #PlatformPapers blog where Allen Li and Gang Wang discuss regulatory interventions on US food-delivery platforms. platformpapers.substack.com/p/regulating...
Regulating Powerful Platforms
Unintended effects of imposing fee caps on US food-delivery platforms
platformpapers.substack.com
May 14, 2024 at 8:07 AM
We often talk about needing to regulate powerful platforms, but such interventions can have unintended second-order effects. Read the latest #PlatformPapers blog where Allen Li and Gang Wang discuss regulatory interventions on US food-delivery platforms. platformpapers.substack.com/p/regulating...
Smaller slices of a growing pie. How do seller entry and market expansion balance each other out in the context of food delivery platforms? Oren Reshef reports on his excellent research in the latest #platformpapers blog! platformpapers.substack.com/p/smaller-sl...
March 28, 2024 at 12:46 PM
Smaller slices of a growing pie. How do seller entry and market expansion balance each other out in the context of food delivery platforms? Oren Reshef reports on his excellent research in the latest #platformpapers blog! platformpapers.substack.com/p/smaller-sl...
Tomorrow is D(MA)-Day! The Digital Markets Act, Europe's framework targeted at gatekeeper companies went into effect last year. March 6, is the deadline for gatekeepers to submit their compliance plans. Read about it in the latest PlatformPapers blog. platformpapers.substack.com/p/6-march-is...
March 5, 2024 at 8:49 AM
Tomorrow is D(MA)-Day! The Digital Markets Act, Europe's framework targeted at gatekeeper companies went into effect last year. March 6, is the deadline for gatekeepers to submit their compliance plans. Read about it in the latest PlatformPapers blog. platformpapers.substack.com/p/6-march-is...
How does the entry of blockbusters on a platform affect the other offerings on the platform? In the latest #PlatformPapers blog, Zhiyi Wang and Lusi Yang explore this question in the context of #Kicstarter's #crowdfunding platform. platformpapers.substack.com/p/winner-tak...
Winner takes all? Blockbusters’ effect on competition in platforms
Evidence from crowdfunding
platformpapers.substack.com
February 14, 2024 at 10:28 AM
How does the entry of blockbusters on a platform affect the other offerings on the platform? In the latest #PlatformPapers blog, Zhiyi Wang and Lusi Yang explore this question in the context of #Kicstarter's #crowdfunding platform. platformpapers.substack.com/p/winner-tak...