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Technological Opportunity and Spillovers of R&D: Evidence from Firms' Patents, Profits and Market Value
TL;DR: In this article, the authors present evidence that firms' patents, profits and market value are systematically related to the technological position of firms' research programs, and that firms are seen to "move" in technology space in response to the pattern of contemporaneous profits at different positions.
Abstract: This paper presents evidence that firms' patents, profits and market value are systematically related to the"technological position" of firms' research programs. Further, firms are seen to "move" in technology space in response to the pattern of contemporaneous profits at different positions. These movements tend to erode excess returns."Spillovers" of R&D are modelled by examining whether the R&D of neighboring firms in technology space has an observable impact on the firm's R&D success. Firms whose neighbors do much R&D produce more patents per dollar of their own R&D,with a positive interaction that gives high R&D firms the largest benefit from spillovers. In terms of profit and market value, however, their are both positive and negative effects of nearby firms' R&D. The net effect is positive for high R&D firms, but firms with R&D about one standard deviation below the mean are made worse off overall by the R&D of others.
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TL;DR: In this paper, the authors present a survey on the use of patent data in economic analysis, focusing on the patent data as an indicator of technological change and concluding that patent data remain a unique resource for the study of technical change.
Abstract: This survey reviews the growing use of patent data in economic analysis. After describing some of the main characteristics of patents and patent data, it focuses on the use of patents as an indicator of technological change. Cross-sectional and time-series studies of the relationship of patents to R&D expenditures are reviewed, as well as scattered estimates of the distribution of patent values and the value of patent rights, the latter being based on recent analyses of European patent renewal data. Time-series trends of patents granted in the U.S. are examined and their decline in the 1970s is found to be an artifact of the budget stringencies at the Patent Office. The longer run downward trend in patents per R&D dollar is interpreted not as an indication of diminishing returns but rather as a reflection of the changing meaning of such data over time. The conclusion is reached that, in spite of many difficulties and reservations, patent data remain a unique resource for the study of technical change.
5,075 citations
TL;DR: In this paper, a theoretical framework that relates three aspects of a firm's ego network (direct ties, indirect ties, and indirect ties) is proposed to assess the effects of a firms network of relations on innovation.
Abstract: To assess the effects of a firm's network of relations on innovation, this paper elaborates a theoretical framework that relates three aspects of a firm's ego network—direct ties, indirect ties, an...
4,829 citations
Cites background or methods from "Technological Opportunity and Spill..."
...To compute the technological distance between partners, I used the approach suggested by Jaffe (1986)....
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...…Thu, 26 Feb 2015 20:45:14 UTC All use subject to JSTOR Terms and Conditions industries are constituted of both contractual knowledge transfers and relatively informal, uncompensated knowledge spillovers or leakages (Jaffe, 1986; Bernstein and Nadiri, 1989; Jaffe, Trajtenberg, and Henderson, 1993)....
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TL;DR: In this paper, the effects of both domestic and foreign R&D capital stocks on total factor productivity were investigated and it was shown that the foreign stocks had large effects on the smaller countries in the sample.
Abstract: Investment in research and development (R&D) affects a country's total factor productivity. Recently new theories of economic growth have emphasized this link and have also identified a number of channels through which a country's R&D affects total factor productivity of its trade partners. Following these theoretical developments we estimate the effects of a country's R&D capital stock and the R&D capital stocks of its trade partners on the country's total factor productivity. We find large effects of both domestic and foreign R&D capital stocks on total factor productivity. The foreign R&D capital stocks have particularly large effects on the smaller countries in our sample (that consists of 22 countries). Moreover, we find that about one-quarter of the worldwide benefits of investment in R&D in the seven largest economies are appropriated by their trade partners.
3,717 citations
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TL;DR: In this article, the existence of geographically mediated "spillovers" from university research to commercial innovation is explored using state-level time-series data on corporate patents, corporate R&D, and university research.
Abstract: The existence of geographically mediated "spillovers" from university research to commercial innovation is explored using state-level time-series data on corporate patents, corporate R&D, and university research. A significant effect of university research on corporate patents is found, particularly in the areas of drugs and medical technology, and electronics, optics, and nuclear technology. In addition, university research appears to have an indirect effect on local innovation by inducing industrial R&D spending. Copyright 1989 by American Economic Association.
3,236 citations
Posted Content•
TL;DR: Hall et al. as mentioned in this paper explored the usefulness of patent citations as a measure of the "importance" of a firm's patents, as indicated by the stock market valuation of the firm's intangible stock of knowledge.
Abstract: Author(s): Hall, Bronwyn H.; Jaffe, A; Trajtenberg, M | Abstract: We explore the usefulness of patent citations as a measure of the "importance" of a firm's patents, as indicated by the stock market valuation of the firm's intangible stock of knowledge. Using patents and citations for 1963-1995, we estimate Tobin's q equations on the ratios of RaD to assets stocks, patents to RaD, and citations to patents. We find that each ratio significantly affects market value, with an extra citation per patent boosting market value by 3%. Further findings indicate that "unpredictable" citations have a stronger effect than the predictable portion, and that self-citations are more valuable than external citations.
2,989 citations
References
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01 Jan 1967
TL;DR: The k-means algorithm as mentioned in this paper partitions an N-dimensional population into k sets on the basis of a sample, which is a generalization of the ordinary sample mean, and it is shown to give partitions which are reasonably efficient in the sense of within-class variance.
Abstract: The main purpose of this paper is to describe a process for partitioning an N-dimensional population into k sets on the basis of a sample. The process, which is called 'k-means,' appears to give partitions which are reasonably efficient in the sense of within-class variance. That is, if p is the probability mass function for the population, S = {S1, S2, * *, Sk} is a partition of EN, and ui, i = 1, 2, * , k, is the conditional mean of p over the set Si, then W2(S) = ff=ISi f z u42 dp(z) tends to be low for the partitions S generated by the method. We say 'tends to be low,' primarily because of intuitive considerations, corroborated to some extent by mathematical analysis and practical computational experience. Also, the k-means procedure is easily programmed and is computationally economical, so that it is feasible to process very large samples on a digital computer. Possible applications include methods for similarity grouping, nonlinear prediction, approximating multivariate distributions, and nonparametric tests for independence among several variables. In addition to suggesting practical classification methods, the study of k-means has proved to be theoretically interesting. The k-means concept represents a generalization of the ordinary sample mean, and one is naturally led to study the pertinent asymptotic behavior, the object being to establish some sort of law of large numbers for the k-means. This problem is sufficiently interesting, in fact, for us to devote a good portion of this paper to it. The k-means are defined in section 2.1, and the main results which have been obtained on the asymptotic behavior are given there. The rest of section 2 is devoted to the proofs of these results. Section 3 describes several specific possible applications, and reports some preliminary results from computer experiments conducted to explore the possibilities inherent in the k-means idea. The extension to general metric spaces is indicated briefly in section 4. The original point of departure for the work described here was a series of problems in optimal classification (MacQueen [9]) which represented special
24,320 citations
TL;DR: In this article, the null hypothesis of no misspecification was used to show that an asymptotically efficient estimator must have zero covariance with its difference from a consistent but asymptonically inefficient estimator, and specification tests for a number of model specifications in econometrics.
Abstract: Using the result that under the null hypothesis of no misspecification an asymptotically efficient estimator must have zero asymptotic covariance with its difference from a consistent but asymptotically inefficient estimator, specification tests are devised for a number of model specifications in econometrics. Local power is calculated for small departures from the null hypothesis. An instrumental variable test as well as tests for a time series cross section model and the simultaneous equation model are presented. An empirical model provides evidence that unobserved individual factors are present which are not orthogonal to the included right-hand-side variable in a common econometric specification of an individual wage equation.
16,198 citations
Book•
01 Jan 1966
2,787 citations
"Technological Opportunity and Spill..." refers background in this paper
...See Schmookler (1966), Pakes and Griliches (1984), Bound, et al (1984), Pakes (1985), and Hirschey (1982)....
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...He notes that in a patent subclass, relating to "dispensing of solids" he found a patent for a toothpaste tube and one for a manure spreader (Schmookler (1966))....
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TL;DR: In this article, the authors take a critical view of contemporary doctrine in this area and present data which suggest that this doctrine offers a dangerous base upon which to build a public policy toward business.
Abstract: UANTITATIVE work in industrial organization has been directed mainly to the task of searching for monopoly even though a vast number of other interesting topics have been available to the student of economic organization. The motives for this preoccupation with monopoly are numerous, but important among them are the desire to be policy-relevant and the ease with which industrial concentration data can be secured. This paper takes a critical view of contemporary doctrine in this area and presents data which suggest that this doctrine offers a dangerous base upon which to build a public policy toward business.
2,331 citations
1,406 citations