Publications

November 1991 (Revised June 1993)
Case

Accounting for Frequent Fliers

By: William J. Bruns Jr.

Airline frequent flier programs offer members the opportunity to earn free flights by accumulating mileage. Accounting and reporting the obligations of airlines and the cost of frequent flier programs raises difficult measurement issues. In 1991, the U.S. Securities... View Details

Keywords: Cost; Fair Value Accounting; Policy; Air Transportation Industry; United States

March 2009 (Revised July 2010)
Case

State Street Corporation

By: William E. Fruhan

To maximize their effectiveness, color cases should be printed in color. State Street Corp. reports a 13% gain in EPS in 2008 amidst a global financial crisis. The stock price declines 59% on the day of the earnings report. This one day decline was exceeded in the... View Details

Keywords: Fair Value Accounting; Financial Reporting; Financial Crisis; Financial Liquidity; Financial Markets; Crisis Management; Financial Services Industry

2017
Working Paper

Innovation, Reallocation and Growth

By: Daron Acemoglu, Ufuk Akcigit, Harun Alp, Nicholas Bloom and William R. Kerr

We build a model of firm-level innovation, productivity growth, and reallocation featuring endogenous entry and exit. A new and central economic force is the selection between high- and low-type firms, which differ in terms of their innovative capacity. We estimate the... View Details

Keywords: Entry; Growth; Industrial Policy; Innovation; R＆D; Reallocation; Selection; Business Ventures; Resource Allocation; Performance Productivity; Policy; Research and Development; Innovation and Invention; Growth and Development; United States

Article

Detecting Adversarial Attacks via Subset Scanning of Autoencoder Activations and Reconstruction Error

By: Celia Cintas, Skyler Speakman, Victor Akinwande, William Ogallo, Komminist Weldemariam, Srihari Sridharan and Edward McFowland III

Reliably detecting attacks in a given set of inputs is of high practical relevance because of the vulnerability of neural networks to adversarial examples. These altered inputs create a security risk in applications with real-world consequences, such as self-driving... View Details

Keywords: Autoencoder Networks; Pattern Detection; Subset Scanning; Computer Vision; Statistical Methods And Machine Learning; Machine Learning; Deep Learning; Data Mining; Big Data; Large-scale Systems; Mathematical Methods; Analytics and Data Science

February 1997 (Revised July 2004)
Case

Walden Woods

By: William J. Poorvu and Arthur I Segel

In 1984, Mortimer Zuckerman and Ed Linde, through their firm, Boston Properties (BP), acquired land in Concord, MA to build a 147,000-square-foot, first-class suburban office building. BP proceeded to go through the permitting and approval process with the town and was... View Details

Keywords: Risk and Uncertainty; Decision Choices and Conditions; Entrepreneurship; Property; Environmental Sustainability; Conflict and Resolution; Real Estate Industry; Massachusetts

January 2018 (Revised May 2018)
Case

AT&T Managing Technological Change and the Future of Telephone Operators in the 20th Century

By: Daniel P. Gross and William R. Kerr

By the 1930s, AT&T dominated the American phone industry, serving 10 million telephones and employing over 100,000 switchboard operators. But beginning in the mid-1910s, the company began changing from manually operated switchboards to mechanical switching systems that... View Details

Keywords: AT＆T; Bell Telephone; Phone Lines; Phone Operators; Mechanical Switching; Layoffs; Technological Change; Transition; History; Innovation and Invention; Technological Innovation; Information Technology; Disruption; Change Management; Communications Industry; Telecommunications Industry; United States

December 1980 (Revised January 1992)
Case

Savannah West

By: William J. Poorvu and John H. Vogel Jr.

Allison Porter, a loan officer for Chemical Bank, must decide whether to make a construction loan on a 216-unit apartment building to be built in Savannah, Georgia. In teaching this case, one begins by looking at the economics, marketing data, etc., of the proposed... View Details

Keywords: Credit; Property; Financing and Loans; Banks and Banking; Housing; Risk Management; Valuation; Real Estate Industry; Banking Industry; Georgia (state, US)

June 2007 (Revised March 2008)
Case

Zoots - Financing Growth (A)

By: Michael J. Roberts, William A. Sahlman and Todd Krasnow

Traces the genesis and founding of Zoots, the largest chain of dry cleaning establishments in the U.S. Founded by some of the founders of the very successful Staples chain, the company raises a very large amount of capital without fully proving its business model, and... View Details

Keywords: Business Startups; Decision Choices and Conditions; Venture Capital; Financial Strategy; Investment Return; Growth and Development Strategy; Valuation; United States

January 1985 (Revised February 1997)
Case

Lotus Development Corp.

By: William A. Sahlman

Contains a description of the history and venture capital financing of Lotus Development. Focuses on issues related to the possible terms of investment in Lotus by a major venture capital firm. The pedagogic objectives in the case are: to explore the elements of the... View Details

Keywords: Technological Innovation; Business or Company Management; Venture Capital; Organizational Structure; Entrepreneurship; Financing and Loans; Outcome or Result; Corporate Finance; Planning; Computer Industry

January 1985
Case

Business Research Corp. (A)

By: William A. Sahlman

Contains a description of a decision confronting an entrepreneur: which of two investment proposals should he accept to fund the creation and marketing of a database that comprises the full text of research reports produced by Wall Street investment banking firms? The... View Details

Keywords: Strategy; Cost vs Benefits; Valuation; Investment Banking; Negotiation Participants; Negotiation Deal; Financing and Loans; Financial Strategy; Corporate Finance; Service Industry

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Article

Entrepreneurship as Experimentation

By: William R. Kerr, Ramana Nanda and Matthew Rhodes-Kropf

Entrepreneurship research is on the rise, but many questions about its fundamental nature still exist. We argue that entrepreneurship is about experimentation: the probabilities of success are low, extremely skewed, and unknowable until an investment is made. At a... View Details

Keywords: Entrepreneurship; Innovation and Invention

2007
Working Paper

What Causes Industry Agglomeration? Evidence from Coagglomeration Patterns

By: Glenn Ellison, Edward Glaeser and William R. Kerr

Many industries are geographically concentrated. Many mechanisms that could account for such agglomeration have been proposed. We note that these theories make different predictions about which pairs of industries should be coagglomerated. We discuss the measurement of... View Details

Keywords: Geographic Location; Labor; Industry Clusters; Transportation; Manufacturing Industry; United States

March 2012
Article

Reviving Entrepreneurship

By: Josh Lerner and William Sahlman

New enterprises don't exist in a vacuum: They rise or fall depending on myriad contextual factors, all of them interrelated, and all of them affected by government policy. U.S. lawmakers must carefully consider the effects of interventions in at least 12 areas, ranging... View Details

Keywords: Entrepreneurship; Government and Politics; Policy; Economy; Public Administration Industry; United States

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Research & Development, Project Code SX-70 - Edwin H. Land & Polaroid | Harvard Business School

evolution of the process as brilliantly envisioned and developed by Edwin Land and his dedicated project team. It required successful outcomes in a number of arenas, all of which would need to coalesce into an interrelated, sequentially... View Details

Summer, 2018
Article

Innovation, Reallocation and Growth

By: Daron Acemoglu, Ufuk Akcigit, Harun Alp, Nicholas Bloom and William R. Kerr

We build a model of firm-level innovation, productivity growth, and reallocation featuring endogenous entry and exit. A new and central economic force is the selection between high- and low-type firms, which differ in terms of their innovative capacity. We estimate the... View Details

Keywords: Entry; Growth; Industrial Policy; Innovation; R＆D; Reallocation; Selection; Market Entry and Exit; Growth and Development; Innovation and Invention; Research and Development; Performance Productivity

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