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In with the Big, Out with the Small: Removing Small-Scale Reservations in India

American Economic Review 2017 107(2), 354-386 open access
An ongoing debate in employment policy is whether promoting small and medium enterprises creates jobs. We use the elimination of small-scale industry (SSI) promotion in India to address this question. For 60 years, SSI promotion in India focused on reserving certain products for manufacture by small and medium enterprises. We identify the consequences for employment growth, investment, output, productivity, and wages of dismantling India's SSI reservations. We exploit variation in the timing of de-reservation across products and also measure the long-run impact of national SSI policy changes using variation in pretreatment exposure at the district level. Districts more exposed to de-reservation experienced higher employment and output growth. Entrants into the de-reserved product spaces and incumbents that were previously constrained by the size restrictions drove the increase in growth. The results suggest that dismantling India's SSI policies encouraged overall employment growth.

Unhealthy Insurance Markets: Search Frictions and the Cost and Quality of Health Insurance

American Economic Review 2011 101(5), 1842-1871
We analyze the effect of search frictions in the market for commercial health insurance. Frictions increase insurance premiums (enough to transfer 13.2 percent of consumer surplus from fully insured employer groups to insurers—approximately $34.4 billion in 1997); and increase insurance turnover (by 64 percent for the average policy). This rent transfer harms consumers and—when combined with heightened turnover—reduces incentives to invest in future health. We also find that a publicly financed insurance option can improve the efficiency of private insurance markets by reducing search friction induced distortions in pricing and marketing efforts.

Strategy-proofness versus Efficiency in Matching with Indifferences: Redesigning the NYC High School Match

American Economic Review 2009 99(5), 1954-1978 open access
The design of the New York City (NYC) high school match involved trade-offs among efficiency, stability, and strategy-proofness that raise new theoretical questions. We analyze a model with indifferences—ties—in school preferences. Simulations with field data and the theory favor breaking indifferences the same way at every school—single tiebreaking—in a student-proposing deferred acceptance mechanism. Any inefficiency associated with a realized tiebreaking cannot be removed without harming student incentives. Finally, we empirically document the extent of potential efficiency loss associated with strategy-proofness and stability, and direct attention to some open questions.

Efficient Kidney Exchange: Coincidence of Wants in Markets with Compatibility-Based Preferences

American Economic Review 2007 97(3), 828-851 open access
Patients needing kidney transplants may have donors who cannot donate to them because of blood or tissue incompatibility. Incompatible patient-donor pairs can exchange donor kidneys with other pairs only when there is a "double coincidence of wants." Developing infrastructure to perform three-way as well as two-way exchanges will have a substantial effect on the number of transplants that can be arranged. Larger than three-way exchanges have less impact on efficiency. In a general model of type-compatible exchanges, the size of the largest exchanges required to achieve efficiency equals the number of types.

A Kidney Exchange Clearinghouse in New England

American Economic Review 2005 95(2), 376-380
In 2003 there were 8,665 transplants of deceased donor kidneys for the approximately 60,000 patients waiting for such transplants in the United States. While waiting, 3,436 patients died. There were also 6,464 kidney transplants from living donors (Scientific Registry of Transplant Recipients web site). Live donation is an option for kidneys, since healthy people have two and can remain healthy with one. While it is illegal to buy or sell organs, there have started to be kidney exchanges involving two donor–patient pairs such that each (living) donor cannot give a kidney to the intended recipient because of blood type or immunological incompatibility, but each patient can receive a kidney from the other donor. So far these have been rare: as of December 2004, only five exchanges had been performed in the 14 transplant centers in New England. One reason there have been so few kidney exchanges is that there have not been databases of incompatible patient–donor pairs. Incompatible donors were simply sent home. (Databases are now being assembled not only in New England, but also in Ohio and Baltimore.) Lainie Friedman Ross et al. (1997) discussed the possibility of exchange between incompatible patient–donor pairs. Not only have a few such two-way exchanges been performed, but two three-way exchanges (in which the donor kidney from one pair is transplanted into the patient in a second pair, whose donor kidney goes to a third pair, whose donor kidney goes to the first pair) have been performed at Johns Hopkins. There have also been a number of “list exchanges” in which an incompatible patient– donor pair makes a donation to someone on the waiting list for a cadaver kidney, in return for the patient in the pair receiving high priority for a cadaver kidney when one becomes available.

The New York City High School Match

American Economic Review 2005 95(2), 364-367
mechanism to match over 90,000 entering students to public high schools each year. This paper makes a very preliminary report on the design process and the first year of operation, in academic year 2003-04, for students entering high school in Fall 2004. In the first year, only about 3,000 students had to be assigned to a school for which they had not indicated a preference, which is only 10 % of the number of such assignments the previous year. New York City has the largest public school system in the country, with over a million students. In 1969 the system was decentralized into over thirty community school districts. In the 1990s, the city began to take more centralized control, and in 2002, a newly reorganized NYCDOE began to reform many aspects of the school system. In May 2003, Dr. Jeremy Lack, then the NYCDOE Director of Strategic Planning, contacted one of us for advice on designing a new high school matching process. The NYCDOE was aware of the matching process for American physicians, the National Resident Matching Program (Roth 1984; Roth and Peranson 1999). They wanted to know if it could be appropriately adapted to the city’s schools. The three authors of the present paper (and, at several crucial junctures, also Tayfun Sönmez) advised (and often convinced) Dr.

Investor Factors

Journal of Finance 2025 80(5), 2789-2830
This paper develops an empirical methodology for extracting pricing factors from investor portfolio data. We apply this approach to the stockholdings of Norwegian individual investors from 1997 to 2017. A two‐factor model, featuring the market portfolio and a long‐short portfolio constructed from the holdings of investors sorted by age or wealth, explains both the common variation in portfolio holdings and the cross section of stock returns. Portfolio tilts toward the long‐short investor factor correlate with indebtedness, macroeconomic exposure, gender, and investment experience. Our paper illustrates the benefits of using holdings data for explaining the risk premia of financial assets.

REPORT OF THE COMMITTEE ON COURSES AND CURRICULA.

The Accounting Review 1963 38(3), 601-607
The task assigned the 1962 Courses and Curricula Committee of the American Accounting Association was "to develop criteria for selecting the content and quality of collegiate accounting educational materials to provide adequate instruction in the body of knowledge that is accounting." The 1961 Committee, which was kept intact for a second year, decided that this task was possible after it discarded other more limited objectives because they involved too many restrictive assumptions to produce useful conclusions. To reduce its task to manageable proportions, the Committee decided to exclude so-called "service" courses, in which accounting is taught primarily to students who are preparing for careers other than accounting careers. For example, the first course in accounting is not considered, since it is offered primarily for those students who do not plan to go on in accounting. As a result, these recommendations apply only to schools which have as one of their objectives educating college students who intend to enter the business world as accountants in industrial, governmental, or public accounting organizations.

PROCEEDINGS OF THE TWELFTH ANNUAL CONVENTION.

The Accounting Review 1928 3(1), 83-94
The article focuses on the proceedings of the twelfth annual convention of the American Association of University Instructors in Accounting, held at Washington D.C., between December 28 and 29, 1927. After some introductory remarks by the organizers, papers were read by W. W. Nissley of the American Institute of Accountants, John R. Wildman of the company Haskins and Sells, David Himmelblau of Northwestern University, Evanston, Illinois, William A. Paton of the University of Michigan, Ann Arbor, Michigan, and J. L. Dohr of Greene and Hurd and of Columbia University, New York, New York. The second program meeting was given over to a discussion of various features of the federal income tax law. Johns Hopkins University's, Baltimore, Maryland, professor presided at the session and opened it with a brief statement introducing the speakers of the afternoon, all of whom were representatives of the Bureau of Internal Revenue. The third program session consisted of a joint meeting with the American Association of Collegiate Schools of Business. The general topic for discussion was "The Place of Accounting in Commerce Curriculum."