138,238 research outputs found
Market Value and Patent Citations: A First Look
No full textAs patent data become more available in machine-readable form, an increasing number of researchers have begun to use measures based on patents and their citations as indicators of technological output and information flow. This paper explores the economic meaning of these citation-based patent measures using the financial market valuation of the firms that own the patents. Using a new and comprehensive dataset containing over 4800 U. S. Manufacturing firms and their patenting activity for the past 30 years, we explore the contributions of R&D spending, patents, and citation-weighted patents to measures of Tobin's Q for the firms. We find that citation-weighted patent stocks are more highly correlated with market value than patent stocks themselves and that this fact is due mainly to the high valuation placed on firms that hold very highly cited patents.
Michael D. Jaffe statement to the 1972 Republican Platform Committee
No full textStatement by Michael D. Jaffe, Chairman of the American-Southern Africa Council, to the Platform Committee at the 1972 Republican National Convention
Innovation, Firm Size, and R&D Search
No full textWe present evidence that small firms perform two to four times more innovations per dollar of R&D than large firms. We propose a search theory of R&D that accounts for the evidence. A firm incurs R&D expenses until it has discovered a level of R&D productivity that is sufficiently great to warrant stopping the search. We show that because the large number of R&D projects run by a large firm becomes a substitute for enhanced R&D productivity, the average R&D productivity of a firm is decreasing in firm size.
Jaffe (A.J.) Stewart (Charles D.) - Man Power Resources and Utilization. Principles of Working Force Analysis.
No full textMeynaud Jean. Jaffe (A.J.) Stewart (Charles D.) - Man Power Resources and Utilization. Principles of Working Force Analysis.. In: Revue économique, volume 4, n°3, 1953. p. 451
Expertise d'un vampire. Mythologie et psychopathologie
No full textJaffe Philippe D., Tschopp Chantal, Dicataldo Frank. Expertise d'un vampire. Mythologie et psychopathologie. In: Bulletin de psychologie, tome 47 n°415, 1994. Expertises en psychologie légale. pp. 349-356
Robust topologies for passive, fiber optic local communication networks
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.Includes bibliographical references (p. 138-140).by Ondria Jaffe Wasem.Ph.D
Technological Change and the Environment
No full textEnvironmental policy discussions increasingly focus on issues related to technological change. This is partly because the environmental consequences of social activity are frequently affected by the rate and direction of technological change, and partly because environmental policy interventions can themselves create constraints and incentives that have significant effects on the path of technological progress. This paper, prepared as a chapter draft for the forthcoming Handbook of Environmental Economics (North-Holland/Elsevier Science), summarizes for environmental economists current thinking on technological change in the broader economics literature, surveys the growing economic literature on the interaction between technology and the environment, and explores the normative implications of these analyses. We begin with a brief overview of the economics of technological change, and then examine three important areas where technology and the environment intersect: the theory and empirical evidence of induced innovation and the related literature on the effects of environmental policy on the creation of new, environmentally friendly technology; the theory and empirics of environmental issues related to technology diffusion; and analyses of the comparative technological impacts of alternative environmental policy instruments. We conclude with suggestions for further research on technological change and the environment.technological change, induced innovation, environment, policy
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