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Show Results For
- All HBS Web
(2,107)
- People (1)
- News (435)
- Research (1,506)
- Events (49)
- Multimedia (13)
- Faculty Publications (928)
- May 2017
- Article
When Discounts Raise Costs: The Effect of Copay Coupons on Generic Utilization
By: Leemore S. Dafny, Christopher Ody and Matt Schmitt
Branded pharmaceutical manufacturers frequently offer “copay coupons” that insulate consumers from cost sharing, thereby undermining insurers’ ability to influence drug utilization. We study the impact of copay coupons on branded drugs first facing generic entry... View Details
Dafny, Leemore S., Christopher Ody, and Matt Schmitt. "When Discounts Raise Costs: The Effect of Copay Coupons on Generic Utilization." American Economic Journal: Economic Policy 9, no. 2 (May 2017): 91–123.
- April 2016 (Revised May 2016)
- Case
Hôpital Universitaire de Mirebalais, Partners In Health in Haiti
By: Robert S. Kaplan, Bipin Mistry and Karla Bertrand
The case describes the application of Time-Driven Activity-Based Costing (TDABC) at a new tertiary hospital, operated by Partners in Health in Mirebelais, Haiti. A project team mapped the clinical processes for use in estimating the direct costs of personnel,... View Details
Keywords: Time-Driven Activity-Based Costing; Activity Based Costing and Management; Cost Accounting; Developing Countries and Economies; Health Care and Treatment; Health Industry; Haiti
Kaplan, Robert S., Bipin Mistry, and Karla Bertrand. "Hôpital Universitaire de Mirebalais, Partners In Health in Haiti." Harvard Business School Case 116-041, April 2016. (Revised May 2016.)
- May 2014
- Article
Dynamics of Demand for Index Insurance: Evidence from a Long-Run Field Experiment
By: Shawn A. Cole, Daniel Stein and Jeremy Tobacman
This paper estimates how experimentally-manipulated experiences with a novel financial product, rainfall index insurance, affect subsequent insurance demand. Using a seven-year panel, we develop three main findings. First, recent experience matters for demand,... View Details
Cole, Shawn A., Daniel Stein, and Jeremy Tobacman. "Dynamics of Demand for Index Insurance: Evidence from a Long-Run Field Experiment." American Economic Review: Papers and Proceedings 104, no. 5 (May 2014): 284–290.
- February 1990 (Revised April 1991)
- Background Note
Quick Response in the Apparel Industry
It has been estimated that the U.S. apparel industry wastes over $25 billion annually due to inefficient practices, long lead times, and insufficient coordination between channel partners. In response to intense competition from off-shore producers, the industry has... View Details
Keywords: Information; Distribution Channels; Performance Efficiency; Partners and Partnerships; Adaptation; Business Strategy; System; Technology; Apparel and Accessories Industry; United States
Hammond, Janice H. "Quick Response in the Apparel Industry." Harvard Business School Background Note 690-038, February 1990. (Revised April 1991.)
When Discounts Raise Costs: The Effect of Copay Coupons on Generic Utilization
Branded pharmaceutical manufacturers frequently offer “copay coupons” that insulate consumers from cost-sharing, thereby undermining insurers’ ability to influence drug utilization. We study the impact of copay coupons on branded drugs first facing generic entry... View Details
- 25 Feb 2019
- Research & Ideas
How Gender Stereotypes Kill a Woman’s Self-Confidence
better handle on, like the Kardashians, Disney movies, cooking, art and literature, and verbal skills. Then they were quizzed in categories considered favorable for men, such as business, math, videogames, cars, and sports. Respondents were asked to View Details
Keywords: by Dina Gerdeman
- 23 Jan 2013
- Working Paper Summaries
Cost of Capital Dynamics Implied by Firm Fundamentals
Keywords: by Matthew Lyle & Charles C.Y. Wang
- 2009
- Working Paper
Endowments, Fiscal Federalism, and the Cost of Capital for States: Evidence from Brazil, 1891-1930
By: Andre C. Martinez Fritscher and Aldo Musacchio
There is a large amount of literature that aims to explain what determines country risk (defined as the difference between the yield of a sovereign's bonds and the risk free rate). In this paper, we contribute to the discussion by arguing that an important explanatory... View Details
Keywords: Trade; Cost of Capital; Revenue; Sovereign Finance; Goods and Commodities; Taxation; Business History; Risk and Uncertainty; Brazil
Martinez Fritscher, Andre C., and Aldo Musacchio. "Endowments, Fiscal Federalism, and the Cost of Capital for States: Evidence from Brazil, 1891-1930." Harvard Business School Working Paper, No. 10-027, October 2009. (Revised December 2009.)
- October 2017
- Article
The Size of the LGBT Population and the Magnitude of Anti-Gay Sentiment Are Substantially Underestimated
By: Katherine Baldiga Coffman, Lucas C. Coffman and Keith M. Marzilli Ericson
We demonstrate that widely used measures of anti-gay sentiment and the size of the LGBT population are misestimated, likely substantially. In a series of online experiments using a large and diverse but non-representative sample, we compare estimates from the standard... View Details
Keywords: LGBTQ; Social Trends ＆ Culture; Economic Theory; Prejudice; Prejudice and Bias; Diversity; Economics; Demographics
Coffman, Katherine Baldiga, Lucas C. Coffman, and Keith M. Marzilli Ericson. "The Size of the LGBT Population and the Magnitude of Anti-Gay Sentiment Are Substantially Underestimated." Management Science 63, no. 10 (October 2017): 3168–3186.
- Research Summary
"Modeling B2B Exchanges" (with Gabor Fath)
B2B exchanges are revolutionizing the way businesses will buy and sell a variety of intermediary products and services. It is estimated that most of the roughly $7 trillion worth of business transactions are likely to go through these new institutions within the next... View Details
- 2024
- Working Paper
Deregulation, Market Power, and Prices: Evidence from the Electricity Sector
By: Alexander MacKay and Ignacia Mercadal
We construct a novel dataset on electricity generation, wholesale transactions, and retail
sales to assess the shift from cost-of-service regulation to deregulated, market-based prices
in the context of the U.S. electricity sector. Consistent with earlier studies, we... View Details
Keywords: Deregulation; Market Power; Markups; Prices; Electricity; Energy; Markets; Governing Rules, Regulations, and Reforms; Price; Utilities Industry
MacKay, Alexander, and Ignacia Mercadal. "Do Markets Reduce Prices? Evidence from the Electricity Sector." Harvard Business School Working Paper, No. 21-095, February 2021. (Revised March 2024. Direct download.)
- Article
Optimal Taxation When Children's Abilities Depend on Parents' Resources
By: Alexander Gelber and Matthew Weinzierl
Empirical research suggests that parents' economic resources affect their children's future earnings abilities. Optimal tax policy therefore treats future ability distributions as endogenous to current taxes. We model this endogeneity, calibrate the model to match... View Details
Gelber, Alexander, and Matthew Weinzierl. "Optimal Taxation When Children's Abilities Depend on Parents' Resources." National Tax Journal 69, no. 1 (March 2016): 11–40. (Winner, Richard A. Musgrave prize for best paper published in the NTJ.
Also HBS Working Paper 13-014 and NBER Working Paper 18332.)
- Research Summary
Fixed NAVs and Costly Puts: US Money Market Mutual Funds (with Peter Tufano)
US money market mutual fund investors have been granted an implicit put option that allows them to sell or redeem their shares at a fixed price of $1.00, regardless of the market value of the portfolio. We describe the institutional features that give rise... View Details
- 2025
- Working Paper
Fiscal Externalities of Transaction Taxes: Evidence from the Los Angeles Mansion Tax
By: Daniel Green, Vikram Jambulapati, Jack Liebersohn and Tejaswi Velayudhan
We estimate the fiscal externalities of a property transfer tax, the Los Angeles
“Mansion Tax”, on the revenues from property taxes when assessed values are closely
tied to transactions. In California, as in over half of U.S. states, growth in tax as-
sessments... View Details
Green, Daniel, Vikram Jambulapati, Jack Liebersohn, and Tejaswi Velayudhan. "Fiscal Externalities of Transaction Taxes: Evidence from the Los Angeles Mansion Tax." SSRN Working Paper Series, No. 5273034, June 2025.
- Working Paper
Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?
By: Marco Sammon and John J. Shim
Value-weighted indexes must rebalance in response to stock market composition changes, e.g., issuance, buybacks, and IPOs. In doing so, existing index funds implicitly engage in market timing. Index funds’ long-short rebalancing portfolios have a -3.5% annual return... View Details
Sammon, Marco, and John J. Shim. "Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?" SSRN Working Paper Series, No. 5080459, May 2025.
- February 2025 (Revised March 2025)
- Case
Accounting for Bitcoin at Block
By: Charles C.Y. Wang, Seil Kim and Sa-Pyung Sean Shin
Abstract: This case explores Block Inc.'s accounting practices for Bitcoin transactions and their impact on financial reporting. Following a 10% stock price drop after missing revenue estimates in Q3 2024, Block faced scrutiny over its Bitcoin-driven revenue model.... View Details
- 2023
- Working Paper
Market Exclusivity and Innovation: Evidence From Antibiotics
By: Edward Kong and Olivia Zhao
The US incentivizes drug innovation via patents as well as market exclusivity periods awarded by the US Food and Drug Administration. We estimate the causal effects of extending market exclusivity for an important drug class: antibiotics. Using a... View Details
Keywords: Health Testing and Trials; Innovation and Invention; Motivation and Incentives; Government Administration; Government Legislation; Pharmaceutical Industry; United States
Kong, Edward, and Olivia Zhao. "Market Exclusivity and Innovation: Evidence From Antibiotics." Working Paper, December 2023.
- November 2022
- Article
The Psychosocial Value of Employment: Evidence from a Refugee Camp
By: Reshmaan Hussam, Erin M. Kelley, Gregory Lane and Fatima Zahra
Employment may be important to wellbeing for reasons beyond its role as an income source. This paper presents a causal estimate of the psychosocial value of employment in refugee camps in Bangladesh. We involve 745 individuals in a field experiment with three arms: a... View Details
Hussam, Reshmaan, Erin M. Kelley, Gregory Lane, and Fatima Zahra. "The Psychosocial Value of Employment: Evidence from a Refugee Camp." American Economic Review 112, no. 11 (November 2022): 3694–3724.
- March 2021
- Article
International Trade and Social Connectedness
By: Michael Bailey, Abhinav Gupta, Sebastian Hillenbrand, Theresa Kuchler, Robert J. Richmond and Johannes Stroebel
We use de-identified data from Facebook to construct a new and publicly available measure of the pairwise social connectedness between 170 countries and 332 European regions. We find that two countries trade more when they are more socially connected, especially for... View Details
Bailey, Michael, Abhinav Gupta, Sebastian Hillenbrand, Theresa Kuchler, Robert J. Richmond, and Johannes Stroebel. "International Trade and Social Connectedness." Journal of International Economics 129 (March 2021).
- 2021
- Working Paper
Diagnosing Quality: Learning, Amenities, and the Demand for Health Care
By: Achyuta Adhvaryu, Emilio Gutierrez, Anant Nyshadham and Jorge Tamayo
We study the role of amenities in increasing demand for underutilized healthcare services. We evaluate the offer of a high-amenity diagnostic consultation for cataracts with a randomized price and find that a lower price for the high-amenity consultation increases... View Details
Keywords: Health Care Demand; Amenities; Health Care Quality; Cataracts; Surgery; Health Care and Treatment; Demand and Consumers; Quality; Learning; Mexico
Adhvaryu, Achyuta, Emilio Gutierrez, Anant Nyshadham, and Jorge Tamayo. "Diagnosing Quality: Learning, Amenities, and the Demand for Health Care." Harvard Business School Working Paper, No. 21-110, March 2021.