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Ellison, Glenn 1965-

Overview
Works: 37 works in 83 publications in 1 language and 969 library holdings
Genres: Periodicals 
Classifications: HB1, 330.072
Publication Timeline
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Publications about Glenn Ellison
Publications by Glenn Ellison
Most widely held works by Glenn Ellison
Risk taking by mutual funds as a response to incentives by Judith A Chevalier( Book )
3 editions published in 1995 in English and held by 74 libraries worldwide
This paper examines the agency conflict between mutual fund investors and mutual fund companies. Investors would like the fund company to use its judgement to maximize risk-adjusted fund returns. A fund company, however, in its desire to maximize its value as a concern has an incentive to take actions which increase the inflow of investment. We use a semiparametric model to estimate the shape of the flow-performance relationship for a sample of growth and growth and income funds observed over the 1982-1992 period. The shape of the flow-performance relationship creates incentives for fund managers to increase or decrease the riskiness of the fund which are dependent on the fund's year-to-date return. Using a new dataset of mutual fund portfolios which includes equity portfolio holdings for September and December of the same year, we show that mutual funds do alter their portfolio riskiness between September and December in a manner consistent with these risk incentives
Career concerns of mutual fund managers by Judith A Chevalier( Book )
3 editions published in 1998 in English and held by 70 libraries worldwide
This paper examines the labor market for mutual fund managers and managers' responses to the implicit incentives created by their career concerns. We find that managerial turnover is sensitie to a fund's recent performance. Consistent with the hypothesis that fund companies are learning about managers' abilities, managerial turnover is more performance-sensitive for younger fund managers. Interpreting the separation-performance relationship as an incentive scheme, several of our results suggest that a desire to avoid separation may induce managers at different stages of their careers to behave differently. Younger fund managers appear to be given less discretion in the management of their funds; i.e. they are more likely to lose their jobs if their fund's beta or unsystematic risk level deviates from the mean for their fund's objective group. We also show that the shape of the job separation-performance relationship may provide an incentive for young mutual fund managers to be risk averse in selecting their fund's portfolio. Consistent with these implicit labor market incentives, younger fund managers do take on lower unsystematic risk and deviate less from typical behavior than their older counterparts. Finally, additional results on the flow of investments into mutual funds suggest that rather than just being due to a screening process, firing decisions may also be influenced by a desire to stimulate inflows of investment into the fund
The slowdown of the economics publishing process by Glenn Ellison( Book )
5 editions published in 2000 in English and held by 68 libraries worldwide
Over the last three decades there has been a dramatic increase in the length of time necessary to publish a paper in a top economics journal. This paper documents the slowdown and notes that a substantial part is due to an increasing tendency of journals to require that papers be extensively revised prior to acceptance. A variety of potential explanations for the slowdown are considered: simple cost and benefit arguments; a democratization of the publishing process; increases in the complexity of papers; the growth of the profession; and an evolution of preferences for different aspects of paper quality. Various time series are examined for evidence that the economics profession has changed along these dimensions. Paper-level data on review times is used to assess connections between underlying changes in the profession and changes in the review process. It is difficult to attribute much of the slowdown to observable changes in the economics profession. Evolving social norms may play a role
Evolving standards for academic publishing : a q-r theory by Glenn Ellison( Book )
4 editions published in 2000 in English and held by 68 libraries worldwide
This paper develops a model of evolving standards for academic publishing. It is motivated by the increasing tendency of academic journals to require multiple revisions of articles and by changes in the content of articles. Papers are modeled as varying along two quality dimensions: q and r. The former represents the clarity and importance of a paper's main ideas and the latter its craftsmanship and polish. Observed trends are regarded as increases in r-quality. A static equilibrium model in which an arbitrary social norm determines how q and r are weighted is developed and used to discuss comparative statics explanations for increases in r. The paper then analyzes a learning model in which referees (who have a biased view of the importance of their own work) try to learn the social norm from observing how their own papers are treated and the decisions editors make on papers they referee. The model predicts that social norms will gradually but steadily evolve to increasingly emphasize r-quality
Geographic concentration as a dynamic process by Guy Dumais( Book )
4 editions published between 1997 and 1998 in English and held by 66 libraries worldwide
The degree of geographic concentration of individual manufacturing industries in the U.S. has declined only slightly in the last twenty years. At the same time, new plant births, plant expansions, contractions and closures have shifted large quantities of employment across plants, firms, and locations. This paper uses data from the Census Bureau's Longitudinal Research Database to examine how relatively stable levels of geographic concentration emerge from this dynamic process. While industries' agglomeration levels tend to remain fairly constant, we find that there is greater variation in the locations of these agglomerations. We then decompose aggregate concentration changes into portions attributable to plant births, expansions, contractions, and closures, and find that the location choices of new firms and differences in growth rates have played the most significant role in reducing levels of geographic concentration, while plant closures have tended to reinforce agglomeration. Finally, we look at coagglomeration patterns to test three of Marshall's theories of industry agglomeration: (1) agglomeration saves transport costs by proximity to input suppliers or final consumers, (2) agglomeration allows for labor market pooling, and (3) agglomeration facilitates intellectual spillovers. While there is some truth behind all three theories, we find that industrial location is far more driven by labor mix than by any of the other explanatory variables
A model of add-on pricing by Glenn Ellison( Book )
3 editions published in 2003 in English and held by 60 libraries worldwide
This paper examines a competitive model of add-on pricing, the practice of advertising low prices for one good in hopes of selling additional products (or a higher quality product) to consumers at a high price at the point of sale. The main conclusion is that add-on pricing softens price competition between firms and results in higher equilibrium profits
Are some mutual fund managers better than others? : cross-sectional patterns in behavior and performance by Judith A Chevalier( Book )
2 editions published in 1996 in English and held by 59 libraries worldwide
In this paper we explore cross-sectional differences in the behavior and performance of mutual fund managers. In our simplest regression of a fund's market excess return on characteristics of its manager we find that younger managers earn much higher returns than older managers and that managers who attended colleges with higher average SAT scores earn much higher returns than do managers from less selective institutions. These differences appear to derive both from systematic differences in expense ratios and risk-taking behavior and from additional systematic differences in performance managers from higher SAT schools have higher risk-adjusted excess returns. Managers with the paper also presents a preliminary look at the labor market for mutual fund managers. Our data suggest that managerial turnover is more performance sensitive for younger managers
Knife edge of plateau : when do market models tip? by Glenn Ellison( Book )
2 editions published in 2003 in English and held by 57 libraries worldwide
This paper studies whether agents must agglomerate at a single location in a class of models of two-sided interaction. In these models there is an increasing returns effect that favors agglomeration, but also a crowding or market-impact effect that makes agents prefer to be in a market with fewer agents of their own type. We show that such models do not tip in the way the term is commonly used. Instead, they have a broad plateau of equilibria with two active markets, and tipping occurs only when one market is below a critical size threshold. Our assumptions are fairly weak, and are satisfied in Krugman's [1991b] model of labor market pooling, a heterogeneous-agent version of Pagano's [1989] asset market model, and Ellison, Fudenberg and oebius's [2002] model of competing auctions
Search, obfuscation, and price elasticities on the Internet by Glenn Ellison( Book )
3 editions published in 2004 in English and held by 57 libraries worldwide
"We examine the competition between a group of Internet retailers that operate in an environment where a price search engine plays a dominant role. We show that for some products in this environment, the easy price search makes demand tremendously price-sensitive. Retailers, though, engage in obfuscation---practices that frustrate consumer search or make it less damaging to firms---resulting in much less price sensitivity on other products. We discuss several models of obfuscation and examine its effects on demand and markups empirically. Observed markups are adequate to allow efficient online retailers to survive"--National Bureau of Economic Research web site
What causes industry agglomeration? evidence from coagglomeration patterns by Glenn Ellison( file )
6 editions published in 2007 in English and held by 49 libraries worldwide
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 coagglomeration and use data from the Census Bureau's Longitudinal Research Database from 1972 to 1997 to compute pairwise coagglomeration measurements for U.S. manufacturing industries. Industry attributes are used to construct measures of the relevance of each of Marshall's three theories of industry agglomeration to each industry pair: (1) agglomeration saves transport costs by proximity to input suppliers or final consumers, (2) agglomeration allows for labor market pooling, and (3) agglomeration facilitates intellectual spillovers. We assess the importance of the theories via regressions of coagglomeration indices on these measures. Data on characteristics of corresponding industries in the United Kingdom are used as instruments. We find evidence to support each mechanism. Our results suggest that input-output dependencies are the most important factor, followed by labor pooling
A simple framework for nonparametric specification testing by Glenn Ellison( file )
3 editions published in 1998 in English and held by 41 libraries worldwide
This paper presents a simple framework for testing the specification of parametric conditional means. The test statistics are based on quadratic forms in the residuals of the null model. Under general assumptions the test statistics are asymptotically normal under the null. With an appropriate choice of the weight matrix, the tests are shown to be consistent and to have good local power. Specific implementations involving matrices of bin and kernel weights are discussed. Finite sample properties are explored in simulations and an application to some parametric models of gasoline demand is presented
Is peer review in decline? by Glenn Ellison( Computer File )
2 editions published in 2007 in English and held by 38 libraries worldwide
Over the past decade there has been a decline in the fraction of papers in top economics journals written by economists from the highest-ranked economics departments. This paper documents this fact and uses additional data on publications and citations to assess various potential explanations. Several observations are consistent with the hypothesis that the Internet improves the ability of high-profile authors to disseminate their research without going through the traditional peer-review process
Strategic entry deterrence and the behavior of pharmaceutical incumbents prior to patent expiration by Glenn Ellison( file )
2 editions published in 2007 in English and held by 38 libraries worldwide
This paper develops a new approach to testing for strategic entry deterrence and applies it to the behavior of pharmaceutical incumbents just before they lose patent protection. The approach involves looking at a cross-section of markets and examining whether behavior is nonmonotonic in the size of the market. Under certain conditions, investment levels will be monotone in market size if firms are not influenced by a desire to deter entry. Strategic investments, however, may be nonmonotone because entry deterrence is unnecessary in very small markets and impossible in very large ones, resulting in overall nonmonotonic investment. The pharmaceutical data contain advertising, product proliferation, and pricing information for a sample of drugs which lost patent protection between 1986 and 1992. Among the findings consistent with an entry deterrence motivation are that incumbents in markets of intermediate size have lower levels of advertising and are more likely to reduce advertising immediately prior to patent expiration
How does the market use citation data? the Hirsch index in economics by Glenn Ellison( Computer File )
3 editions published in 2010 in English and held by 35 libraries worldwide
A large literature following Hirsch (2005) has proposed citation-based indexes that could be used to rank academics. This paper examines how well several such indexes match labor market outcomes using data on the citation records of young tenured economists at 25 U.S. departments. Variants of Hirsch's index that emphasize smaller numbers of highly-cited papers perform better than Hirsch's original index and have substantial power to explain which economists are tenured at which departments. Adjustment factors for differences across fields and years of experience are presented
A search cost model of obfuscation by Glenn Ellison( file )
2 editions published in 2009 in English and held by 32 libraries worldwide
This paper develops search-theoretic models in which it is individually rational for firms to engage in obfuscation. It considers oligopoly competition between firms selling a homogeneous good to a population of rational consumers who incur search costs to learn each firm's price. Search costs are endogenized: obfuscation is equated with unobservable actions that make it more time-consuming to inspect a product and learn its price. We note two mechanisms by which obfuscation can affect consumer beliefs about future search costs: a direct effect that applies when search costs are convex in time spent searching and a signal-jamming effect that applies when an informational link is present. As long as obfuscation is costless for firms, the presence of either of these mechanisms guarantees that obfuscation must occur in equilibrium, unless consumer search costs are already so high that consumers are willing to purchase at the highest equilibrium price in the absence of obfuscation. Changes in consumer search costs are at least partially offset by changes in the equilibrium level of obfuscation, raising doubts about whether reductions in consumer search costs must make markets more competitive. We also examine patterns of obfuscation and show that higher markups are usually associated with more obfuscation
Position auctions with consumer search by Susan Athey( Computer File )
2 editions published in 2009 in English and held by 32 libraries worldwide
This paper examines a model in which advertisers bid for "sponsored-link" positions on a search engine. The value advertisers derive from each position is endogenized as coming from sales to a population of consumers who make rational inferences about firm qualities and search optimally. Consumer search strategies, equilibrium bidding, and the welfare benefits of position auctions are analyzed. Implications for reserve prices and a number of other auction design questions are discussed
Heterogeneity in high math achievement across schools evidence from the American Mathematics Competitions by Glenn Ellison( Computer File )
2 editions published in 2012 in English and held by 31 libraries worldwide
This paper explores differences in the frequency with which students from different schools reach high levels of math achievement. Data from the American Mathematics Competitions is used to produce counts of high-scoring students from more than two thousand public, coeducational, non-magnet, non-charter U.S. high schools. High-achieving students are found to be very far from evenly distributed. There are strong demographic predictors of high achievement.There are also large differences among seemingly similar schools. The unobserved heterogeneity across schools includes a thick tail of schools that produce many more high-achieving students than the average school. Gender-related differences and other breakdowns are also discussed
The gender gap in secondary school mathematics at high achievement levels evidence from the American Mathematics Competitions by Glenn Ellison( Computer File )
2 editions published in 2009 in English and held by 28 libraries worldwide
This paper uses a new data source, American Mathematics Competitions, to examine the gender gap among high school students at very high achievement levels. The data bring out several new facts. There is a large gender gap that widens dramatically at percentiles above those that can be examined using standard data sources. An analysis of unobserved heterogeneity indicates that there is only moderate variation in the gender gap across schools. The highest achieving girls in the U.S. are concentrated in a very small set of elite schools, suggesting that almost all girls with the ability to reach high math achievement levels are not doing so
Internet retail demand taxes, geography, and online-offline competition by Glenn Ellison( Book )
2 editions published in 2006 in English and held by 21 libraries worldwide
Data on sales of memory modules are used to explore several aspects of e-retail demand. There is a strong relationship between e-retail sales to a given state and sales tax rates that apply to purchases from offline retailers. This suggests that there is substantial substitution between online and offline retail and tax avoidance may be an important contributor to e-retail activity. Geography matters in two ways: we find some evidence that consumers prefer purchasing from firms in nearby states to benefit from faster shipping times as well as evidence of a separate preference for buying from in-state firms. Consumers appear fairly rational in some ways, but boundedly rational in others. Keywords: E commerce, internet taxation, discrete choice analysis. JEL Classifications: D12, H20, L81, R12
Dynamics of open source movements by Susan Athey( Book )
5 editions published in 2010 in English and held by 12 libraries worldwide
This paper considers a dynamic model of the evolution of open source software projects, focusing on the evolution of quality, contributing programmers, and users who contribute customer support to other users. Programmers who have used open source software are motivated by reciprocal altruism to publish their own improvements. The evolution of the open-source project depends on the form of the altruistic benefits: in a base case the project grows to a steady-state size from any initial condition; whereas adding a need for customer support makes zero-quality a locally absorbing state. We also analyze competition by commercial firms with OSS projects. Optimal pricing policies again vary: in some cases the commercial firm will set low prices when the open-source project is small; in other cases it mostly waits until the open-source project has matured
 
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Alternative Names
Ellison, Glenn D. 1965-
Ellison, Glenn David 1965-
Languages
English (60)
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