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Publications

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    • All HBS Web  (1,574)
      • Faculty Publications  (299)

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      • 2025
      • Working Paper

      Rethinking Volume

      By: Philippe van der Beck, Lorenzo Bretscher and Zhiyu Julie Fu
      Gross trading volumes in financial markets are large and far exceed return volatility. In contrast, “net volume”—trading from persistent portfolio reallocations—is substantially lower, as it excludes transitory round-trip trades. This observation reveals a fundamental... View Details
      Keywords: Financial Markets; Investment Return; Asset Pricing; Volatility
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      van der Beck, Philippe, Lorenzo Bretscher, and Zhiyu Julie Fu. "Rethinking Volume." Harvard Business School Working Paper, No. 26-003, July 2025.
      • July 2025
      • Module Note

      Supply and Demand for Strategists

      By: Quan Le
      This module note introduces students to the foundational microeconomic principles of supply and demand. It uses the example of an aluminum plant (specifically, production quantity and shutdown decisions) to discuss short-run vs. long-run decisions, marginal costs, sunk... View Details
      Keywords: Business Exit or Shutdown; Business or Company Management; Business Strategy; Competition; Competitive Advantage; Cost of Capital; Cost vs Benefits; Decision Making; Decisions; Demand and Consumers; Economics; Economic Systems; For-Profit Firms; Market Entry and Exit; Market Participation; Markets; Metals and Minerals; Microeconomics; Price; Revenue; Strategy; Supply and Industry; Manufacturing Industry
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      Le, Quan. "Supply and Demand for Strategists." Harvard Business School Module Note 726-352, July 2025.
      • May–June 2025
      • Article

      Algorithmic Assortment Curation: An Empirical Study of Buybox in Online Marketplaces

      By: Santiago Gallino, Nil Karacaoglu and Antonio Moreno
      Most online sales worldwide take place in marketplaces that connect sellers and buyers. The presence of numerous third-party sellers leads to a proliferation of listings for each product, making it difficult for customers to choose between the available options. Online... View Details
      Keywords: Algorithms; Marketplaces; Marketplace Matching; E-commerce; Demand and Consumers; Customer Focus and Relationships; Market Participation; Technology Adoption
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      Gallino, Santiago, Nil Karacaoglu, and Antonio Moreno. "Algorithmic Assortment Curation: An Empirical Study of Buybox in Online Marketplaces." Manufacturing & Service Operations Management 27, no. 3 (May–June 2025): 917–934.
      • Summer 2025
      • Article

      Dynamic Competition for Customer Memberships

      By: Cristian Chica, Julian Jimenez-Cardenas and Jorge Tamayo
      A competitive two-period membership (subscription) market is analyzed. Two symmetric firms charge a “membership” fee that allows consumers to buy products or services at a given unit price for both periods. Firms can choose between long- or short-term memberships. When... View Details
      Keywords: Competitive Price Discrimination; Membership; Dynamic Competition; Competition; Price; Consumer Behavior; Business Model
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      Chica, Cristian, Julian Jimenez-Cardenas, and Jorge Tamayo. "Dynamic Competition for Customer Memberships." Journal of Economics & Management Strategy 34, no. 2 (Summer 2025): 525–556.
      • 2025
      • Working Paper

      An Empirical Examination of Business Climate Alliances: Effective and/or Harmful?

      By: Matteo Gasparini and Peter Tufano
      This research studies business alliances that seek to address climate change, offering empirical evidence to address claims advanced by alliance supporters and critics. We study eleven major alliances mostly focused on financial services firms and 424 major... View Details
      Keywords: Antitrust; Climate Change; Financial Institutions; Competition; Network Effects; Alliances
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      Gasparini, Matteo, and Peter Tufano. "An Empirical Examination of Business Climate Alliances: Effective and/or Harmful?" Harvard Business School Working Paper, No. 25-060, May 2025.
      • 2025
      • Working Paper

      The Limits of Insurance Demand and the Growing Protection Gap

      By: Parinitha Sastry, Tess Scharlemann, Ishita Sen and Ana-Maria Tenekedjieva
      In a world with rising risk, how much are U.S. households willing to pay for homeowners insurance, and what does their demand imply for the future of insurance markets? We provide the first estimates of household willingness to pay for homeowners insurance and the... View Details
      Keywords: Climate Change; Risk and Uncertainty; Insurance; Personal Finance; Consumer Behavior; Mortgages
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      Sastry, Parinitha, Tess Scharlemann, Ishita Sen, and Ana-Maria Tenekedjieva. "The Limits of Insurance Demand and the Growing Protection Gap." Harvard Business School Working Paper, No. 25-054, February 2025.
      • April 2025
      • Case

      Breezm: Innovative 3D-Printed Eyewear (A)

      By: Juan Alcácer, Brian Mao Fu and Adina Wong
      In 2023, Breezm, a South Korean startup, faced a strategic decision about how to grow its innovative 3D-printed, custom-fit eyewear business. Co-founded in 2017 by Zenma Park and Wooseok Sung, Breezm combined facial scanning, AI, and in-house production to solve the... View Details
      Keywords: 3D Printing; Eyeyewear; Growth; Business Startups; AI and Machine Learning; Technological Innovation; Growth and Development Strategy; Risk and Uncertainty; Expansion; South Korea
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      Alcácer, Juan, Brian Mao Fu, and Adina Wong. "Breezm: Innovative 3D-Printed Eyewear (A)." Harvard Business School Case 725-376, April 2025.
      • 2025
      • Working Paper

      Tracking the Short-Run Price Impact of U.S. Tariffs

      By: Alberto Cavallo, Paola Llamas and Franco Vazquez
      This paper examines the short-run impact of the 2025 U.S. tariffs on consumer prices using a unique integration of high-frequency retail pricing data, product-level country-of-origin information, and detailed tariff classifications. By linking daily prices from major... View Details
      Keywords: Tariffs; Trade; Price; Inflation and Deflation
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      Cavallo, Alberto, Paola Llamas, and Franco Vazquez. "Tracking the Short-Run Price Impact of U.S. Tariffs." Working Paper, April 2025.
      • January 2025
      • Case

      Index and Active Investing: Vanguard and the New Frontier of Active ETFs

      By: Marco Sammon, Luis M. Viceira and Jonathan Kanagasabai
      This case explores Vanguard’s strategic decision-making process as it considers entering the growing market for actively managed exchange-traded funds (ETFs). Set in 2024, the case places students in the position of Rodney Comegys, Vanguard’s global head of the Equity... View Details
      Keywords: Asset Management; Financial Strategy; Investment Funds; Investment Portfolio; Financial Services Industry
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      Sammon, Marco, Luis M. Viceira, and Jonathan Kanagasabai. "Index and Active Investing: Vanguard and the New Frontier of Active ETFs." Harvard Business School Case 225-056, January 2025.
      • 2025
      • Working Paper

      Combining Complements: Theory and Evidence from Cancer Treatment Innovation

      By: Rebekah Dix and Todd A. Lensman
      Innovations often combine several components to achieve outcomes greater than the “sum of the parts.” We argue that such combination innovations can introduce an understudied inefficiency—a positive market expansion externality that benefits the owners of the... View Details
      Keywords: Innovation Strategy; Outcome or Result; Collaborative Innovation and Invention; Health Testing and Trials; Health Industry
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      Dix, Rebekah, and Todd A. Lensman. "Combining Complements: Theory and Evidence from Cancer Treatment Innovation." Working Paper, January 2025.
      • November 2024
      • Case

      Fyffes International SA

      By: David E. Bell, Damien McLoughlin and Tonia Labruyère
      Helge Sparsoe, CEO of Fyffes since 2020, had taken the tropical produce importer and distributor back to a path of stable level of profitability since he joined in 2020. He was now thinking about next steps for the business, which mainly traded in bananas. He was... View Details
      Keywords: Plant-Based Agribusiness; Change Management; Environmental Sustainability; Brands and Branding; Demand and Consumers; Supply Chain; Competition; Price; Value Creation; Agriculture and Agribusiness Industry; Food and Beverage Industry; Switzerland; United Kingdom; Republic of Ireland; Colombia; Guatemala; Costa Rica; Ecuador
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      Bell, David E., Damien McLoughlin, and Tonia Labruyère. "Fyffes International SA." Harvard Business School Case 525-028, November 2024.
      • November 2024
      • Article

      Price Discounts and Cheapflation During the Post-Pandemic Inflation Surge

      By: Alberto Cavallo and Oleksiy Kryvtsov
      We study how within-store price variation changes with inflation, and whether households exploit it to attenuate the inflation burden. We use micro price data for food products sold by 91 large multi-channel retailers in ten countries between 2018 and 2024. Measuring... View Details
      Keywords: Macroeconomics; Inflation and Deflation; Price; Consumer Behavior; Personal Finance; Product Positioning
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      Cavallo, Alberto, and Oleksiy Kryvtsov. "Price Discounts and Cheapflation During the Post-Pandemic Inflation Surge." Journal of Monetary Economics 148 (November 2024).
      • 2024
      • Article

      Supply and Demand and the Term Structure of Interest Rates

      By: Robin Greenwood, Samuel Hanson and Dimitri Vayanos
      We survey the growing literature emphasizing the role that supply-and-demand forces play in shaping the term structure of interest rates. Our starting point is the Vayanos and Vila (2009, 2021) model of the term structure of default-free bond yields, which we present... View Details
      Keywords: Demand and Consumers; Interest Rates; Bonds; Financial Markets
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      Greenwood, Robin, Samuel Hanson, and Dimitri Vayanos. "Supply and Demand and the Term Structure of Interest Rates." Annual Review of Financial Economics 16 (2024): 115–151.
      • 2024
      • Working Paper

      Primary Capital Market Transactions and Index Funds

      By: Marco Sammon and Chris Murray
      We document the effects of mechanical buying by CRSP-index-tracking funds on post-IPO returns and IPO deal structure. Leveraging a difference-in-differences-style design built on a 2017 CRSP rule change, we find that expected index fund demand leads fast track IPOs to... View Details
      Keywords: Investment Funds; Initial Public Offering; Investment Return; Price; Market Transactions; Financial Markets
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      Sammon, Marco, and Chris Murray. "Primary Capital Market Transactions and Index Funds." Working Paper, August 2024.
      • 2024
      • Working Paper

      Who Clears the Market When Passive Investors Trade?

      By: Marco Sammon and John J. Shim
      We find that firms are the primary sellers of shares when index funds are net buyers, providing shares at a nearly one-for-one rate. Rather than provide liquidity, most demand-side institutions trade in the same direction as index funds, especially over long horizons.... View Details
      Keywords: Investment Funds; Institutional Investing; Price; Investment Portfolio; Financial Institutions; Financial Instruments
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      Sammon, Marco, and John J. Shim. "Who Clears the Market When Passive Investors Trade?" Working Paper, August 2024.
      • July 2024 (Revised January 2025)
      • Case

      Dynamic Pricing at Wendy's: Where's the Beef?

      By: Elie Ofek, Alicia Dadlani and Martha Hostetter
      In early 2024, Wendy’s new CEO announced on an earnings call that the company would install digital menus in its US locations so it could begin testing dynamic pricing—changing prices up or down in response to shifts in supply and demand – as well as allow engaging in... View Details
      Keywords: Dynamic Pricing; Marketing Strategy; Price; Technology Adoption; Consumer Behavior; AI and Machine Learning; Customer Focus and Relationships; Policy; Food and Beverage Industry
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      Ofek, Elie, Alicia Dadlani, and Martha Hostetter. "Dynamic Pricing at Wendy's: Where's the Beef?" Harvard Business School Case 525-010, July 2024. (Revised January 2025.)
      • July–August 2024
      • Article

      Doing More with Less: Overcoming Ineffective Long-Term Targeting Using Short-Term Signals

      By: Ta-Wei Huang and Eva Ascarza
      Firms are increasingly interested in developing targeted interventions for customers with the best response, which requires identifying differences in customer sensitivity, typically through the conditional average treatment effect (CATE) estimation. In theory, to... View Details
      Keywords: Long-run Targeting; Heterogeneous Treatment Effect; Statistical Surrogacy; Customer Churn; Field Experiments; Consumer Behavior; Customer Focus and Relationships; AI and Machine Learning; Marketing Strategy
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      Huang, Ta-Wei, and Eva Ascarza. "Doing More with Less: Overcoming Ineffective Long-Term Targeting Using Short-Term Signals." Marketing Science 43, no. 4 (July–August 2024): 863–884.
      • July 2024
      • Article

      The Passive-Ownership Share Is Double What You Think It Is

      By: Alex Chinco and Marco Sammon
      Each time a stock gets added to or dropped from a benchmark index, we ask: “How much money would have to be tracking that index to explain the huge spike in rebalancing volume we observe on reconstitution day?” While index funds held 16% of the US stock market in 2021,... View Details
      Keywords: Indexing; Passive Investing; Exchange-traded Funds (ETFs); Russell Reconstitution Day; Trading Volume; Information-based Asset Pricing; Investment Funds; Asset Pricing
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      Chinco, Alex, and Marco Sammon. "The Passive-Ownership Share Is Double What You Think It Is." Journal of Financial Economics 157 (July 2024).
      • June 2024
      • Article

      Inflation with COVID Consumption Baskets

      By: Alberto Cavallo
      The Covid-19 pandemic led to changes in expenditure patterns that introduced significant bias in the measurement of Consumer Price Index (CPI) inflation. Using publicly-available data on card transactions, I updated the official CPI weights and re-calculated inflation... View Details
      Keywords: COVID; Consumer Expenditures; CPI; Inflation; Consumer Behavior; Inflation and Deflation; Health Pandemics
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      Cavallo, Alberto. "Inflation with COVID Consumption Baskets." Special Issue on The Global Economy: Looking Back, Moving Forward, Part II. IMF Economic Review 72, no. 2 (June 2024): 902–917.
      • June 2024
      • Article

      Information Spillovers in Experience Goods Competition

      By: Zhuoqiong Charlie Chen, Christopher Stanton and Catherine Thomas
      When experience goods compete, consuming one product can be informative about value for similar untried products. We study a two-period model of duopoly competition in markets that have this feature and where firms can price discriminate between consumers based on... View Details
      Keywords: Experience Goods; Competition; Information; Demand and Consumers; Profit; Price
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      Chen, Zhuoqiong Charlie, Christopher Stanton, and Catherine Thomas. "Information Spillovers in Experience Goods Competition." Management Science 70, no. 6 (June 2024): 3923–3950.
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