Publications

2021
Working Paper

Friends and Family Money: P2P Transfers and Financially Fragile Consumers

By: Tetyana Balyuk and Emily Williams

We assess the impact that real time money transfer technology has on consumer outcomes, particularly during periods of financial fragility. We do this by developing a new data set that documents use of Zelle—the most widely used P2P money transfer technology in the... View Details

Keywords: P2P Money Transfers; Real Time Payments; Fintech; Finance; Information Technology; Personal Finance; Financial Condition

SSRN

November 2021
Article

Ratings, Reviews, and the Marketing of New Products

By: Itay P. Fainmesser, Dominique Olié Lauga and Elie Ofek

We study how user-generated content (UGC) about new products impacts a firm's advertising and pricing decisions and the effect on profits and market dynamics. We construct a two-period model where consumers value quality and are heterogeneous in their taste for the new... View Details

Keywords: Online Reviews; Product Ratings; Social Networks; Word Of Mouth; Pricing; User-generated Content; Advertising; Product Marketing; Price; Consumer Behavior; Product Positioning; Social Media

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October 18, 2021
Article

To Regulate Network-Based Platforms, Look at Their Data

By: Chiara Farronato and Daniel Björkegren

Historically, antitrust authorities have taken a laissez-faire approach under the assumption that it is better to err on the side of not intervening when there is uncertainty. This has allowed companies like Google and Facebook to go on a shopping spree to acquire... View Details

Keywords: Antitrust Issues And Policies; Risk and Uncertainty; Digital Platforms; Competitive Advantage; Governing Rules, Regulations, and Reforms; Innovation and Invention; Information Technology Industry

Find at Harvard

October 2021 (Revised February 2023)
Case

Ant Group (A)

By: Krishna G. Palepu, Feng Zhu, Susie L. Ma and Kerry Herman

In 2004, Chinese e-commerce company Alibaba created Alipay, an app to facilitate payments on its e-commerce sites. As Alibaba grew, so did Alipay, until Alipay spawned its own ecosystem of financial technology products and services under the name of Ant Group. By 2020,... View Details

Keywords: Payment Systems; Information Technology; Value Creation; Network Effects; Strategy; Disruptive Innovation; Initial Public Offering; Technology Industry; Financial Services Industry; China

September 2021
Supplement

Telepass: From Tolling to Mobility Platform

By: Chiara Farronato, Stefano Denicolai and Sarah Mehta

This supplementary dataset can be paired with the case entitled “Telepass: From Tolling to Mobility Platform” (case no. 622-011), to allow students the opportunity to analyze data before class. View Details

Keywords: Analysis; Change; Change Management; Transformation; Transition; Innovation and Invention; Strategy; Information Technology; Mobile and Wireless Technology; Transportation; Transportation Networks; Value; Value Creation; Technology Industry; Transportation Industry; Insurance Industry; Europe; Italy; Milan

September 2021 (Revised December 2021)
Case

Telepass: From Tolling to Mobility Platform

By: Chiara Farronato, Stefano Denicolai and Sarah Mehta

Telepass, until very recently the sole processor of electronic toll payments on Italy’s highways, has ambitions beyond tolling. Since the mid-2010s, the company has been expanding into adjacent services. In 2017, Telepass launched TelepassPay—a mobile payment... View Details

September 2021 (Revised December 2021)
Case

Telepass: From Tolling to Mobility Platform (Abridged)

By: Chiara Farronato, Stefano Denicolai and Sarah Mehta

Telepass, until very recently the sole processor of electronic toll payments on Italy’s highways, has ambitions beyond tolling. Since the mid-2010s, the company has been expanding into adjacent services. In 2017, Telepass launched TelepassPay—a mobile payment... View Details

September 2021
Article

Network Interconnectivity and Entry into Platform Markets

By: Feng Zhu, Xinxin Li, Ehsan Valavi and Marco Iansiti

Digital technologies have led to the emergence of many platforms in our economy today. In certain platform networks, buyers in one market purchase services from providers in many other markets, whereas in others, buyers primarily purchase services from providers within... View Details

Keywords: Network Interconnectivity; Platform Competition; Market Entry; Networks; Digital Platforms; Competition; Market Entry and Exit

2021
Working Paper

The Value of Data and Its Impact on Competition

By: Marco Iansiti

Common regulatory perspective on the relationship between data, value, and competition in online platforms has increasingly centered on the volume of data accumulated by incumbent firms. This view posits the existence of "data network effects," where more data leads to... View Details

Keywords: Online Platforms; Data Network Effects; Analytics and Data Science; Value; Competition; Digital Platforms

SSRN

July 2021
Article

Outsourcing Tasks Online: Matching Supply and Demand on Peer-to-Peer Internet Platforms

By: Zoë Cullen and Chiara Farronato

We study the growth of online peer-to-peer markets. Using data from TaskRabbit, an expanding marketplace for domestic tasks at the time of our study, we show that growth varies considerably across cities. To disentangle the potential drivers of growth, we look... View Details

Keywords: Two-sided Market; Two-sided Platforms; Peer-to-peer Markets; Platform Strategy; Sharing Economy; Platform Growth; Internet and the Web; Digital Platforms; Strategy; Market Design; Network Effects

2021
Chapter

Towards a Unified Framework for Fair and Stable Graph Representation Learning

By: Chirag Agarwal, Himabindu Lakkaraju and Marinka Zitnik

As the representations output by Graph Neural Networks (GNNs) are increasingly employed in real-world applications, it becomes important to ensure that these representations are fair and stable. In this work, we establish a key connection between counterfactual... View Details

Keywords: Graph Neural Networks; AI and Machine Learning; Prejudice and Bias

April 2021
Case

The Clean Network and the Future of Global Technology Competition

By: Meg Rithmire and Courtney Han

In May 2019, amidst of an ever-worsening trade war between the U.S. and China, President Donald Trump added Chinese telecom giant Huawei to the Department of Commerce’s “entity list,” essentially forbidding American firms from doing business with the company. Huawei,... View Details

Keywords: 5G; Telecommunications; Information Technology; Internet and the Web; Mobile and Wireless Technology; Trade; Competition; International Relations; Telecommunications Industry; China

April 2021
Case

Codecademy: Where to Next?

By: Jeffrey F. Rayport, Max Mailman and Sarah Ascherman

In March 2020, Zach Sims, co-founder and CEO of online education platform Codecademy, prepared for a meeting with his Chief of Staff Kunal Ahuja to discuss the company’s goals. Codecademy billed itself as the largest online resource for computer science literacy and... View Details

Keywords: Monetization Strategy; Business Model; Change Management; Venture Capital; Leading Change; Growth and Development Strategy; Growth Management; Management Teams; Marketing Channels; Product Marketing; Network Effects; Product Development; Organizational Change and Adaptation; Strategic Planning; Internet and the Web; Digital Platforms; United States

2021
Article

Fair Influence Maximization: A Welfare Optimization Approach

By: Aida Rahmattalabi, Shahin Jabbari, Himabindu Lakkaraju, Phebe Vayanos, Max Izenberg, Ryan Brown, Eric Rice and Milind Tambe

Several behavioral, social, and public health interventions, such as suicide/HIV prevention or community preparedness against natural disasters, leverage social network information to maximize outreach. Algorithmic influence maximization techniques have been proposed... View Details

2021
Working Paper

Accounting for Product Impact in the Telecommunications Industry

By: George Serafeim and Katie Trinh

We apply the product impact measurement framework of the Impact-Weighted Accounts Initiative (IWAI) in two competitor companies within the telecommunications industry. We design a monetization methodology that allows us to calculate monetary impact estimates of network... View Details

SSRN

March 2021 (Revised February 2025)
Teaching Note

Afterpay U.S.: The Omnichannel Dilemma

By: Antonio Moreno and Anibha Singh

Teaching Note for HBS Case No. 519-086. In 2018, Nick Molnar, the founder of the Australia-based online payment service Afterpay began its expansion to the U.S. market. The service had gained a loyal following in Australia by enabling customers to pay for online... View Details

March 2021
Article

The Impact of the General Data Protection Regulation on Internet Interconnection

By: Ran Zhuo, Bradley Huffaker, KC Claffy and Shane Greenstein

The Internet comprises thousands of independently operated networks, where bilaterally negotiated interconnection agreements determine the flow of data between networks. The European Union’s General Data Protection Regulation (GDPR) imposes strict restrictions on... View Details

Keywords: Personal Data; Privacy Regulation; GDPR; Interconnection Agreements; Internet and the Web; Governing Rules, Regulations, and Reforms

February 2021
Case

Threadless: The Renewal of an Online Community

By: Shane Greenstein, Karim Lakhani and Christian Godwin

Threadless, an online apparel company and artist community which Jake Nickell founded in 2000, continued to maintain its status as a top company in the online apparel industry during its second decade. From 2010 to 2020, Threadless continued to operate its... View Details

February 2021 (Revised March 2022)
Case

TikTok in 2020: Super App or Supernova?

By: Jeffrey F. Rayport, Dan Maher and Dan O'Brien

TikTok’s parent company, ByteDance, was launched in 2012 around a simple idea – helping users entertain themselves on their smartphones while on the Beijing Subway. In less than a decade, it had become one of the world’s most valuable private companies, with investors... View Details