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排序方式: 共有193条查询结果,搜索用时 15 毫秒
141.
Igor Letina 《The Rand journal of economics》2016,47(2):433-460
This article examines the effects of market structure on the variety of research projects undertaken and the amount of duplication of research. A characterization of the equilibrium market portfolio of R&D projects and the socially optimal portfolio is provided. It is shown that a merger decreases the variety of developed projects and decreases the amount of duplication of research. An increase in the intensity of competition among firms leads to an increase in the variety of developed projects and a decrease in the amount of duplication of research. 相似文献
142.
Economic growth may be developed on the basis on combination of different factors. In this investigation was analyzed the economic growth forecasting based on the different factors. The main goal was to analyze the influence of science and technology factors on the economic growth. Gross domestic product (GDP) was used as economic growth indicator. The method of adaptive neuro fuzzy inference system (ANFIS) was applied to the data in order to select the most influential factors for the GDP growth rate forecasting. Ten inputs are considered: research and development (R&D) expenditure in GDP, scientific and technical journal articles, patent applications for nonresidents, patent applications for residents, trademark applications for nonresidents, trademark applications for residents, total trademark applications, researchers in R&D, technicians in R&D and high-technology exports. The ANFIS process for variable selection was also implemented in order to detect the predominant factors affecting the forecasting of GDP growth rate. 相似文献
143.
144.
This paper studies the choice between general and specific human capital. A trade-off arises because general human capital, while less productive, can easily be reallocated across firms. Accordingly, the fraction of individuals with specific human capital depends on the amount of uncertainty in the economy. Our model implies that while economies with more specific human capital tend to be more productive, they also tend to be more vulnerable to turbulence. As such, our theory sheds some light on the experience of Japan, where human capital is notoriously specific: while Japan benefited from this predominately specific labor force in tranquil times, this specificity may also have been at the heart of its prolonged stagnation. 相似文献
145.
Systematic strategic management is a recent and still developing concern of both practitioners and students of management. It is necessary, therefore, to define in this first issue of the Strategic Management Journal (SMJ) both the limits and the contents of the subject which will be welcomed to its pages. Since we hope to attract our readers and contributors from both practice and academia, it is appropriate to describe strategic management from their respective viewpoints. 相似文献
146.
Using a large sample of domestic and foreign IPOs in the US, we investigate how threats of enforcement by the Securities and Exchange Commission (SEC) and private litigation influence earnings management in IPO prospectuses. We propose that perceptions of foreign institutions may influence SEC enforcement action and private litigation. We provide evidence that enforcement and litigation threats are negatively related to the strength of legal institutions in the foreign IPO’s country of origin. We find earnings management is more pronounced in foreign IPOs from countries with strong legal institutions. We further explore whether earnings management is priced in the IPO market and find no relation between IPO proceeds and earnings management. Our results are consistent with upward earnings management as in Stein (1989), the magnitude of which is reduced when the anticipated cost of enforcement and litigation is higher. Collectively, our results cast doubt on the validity of the bonding hypothesis. 相似文献
147.
Igor Kopylov 《Journal of Economic Theory》2007,133(1):236-265
The Savagian choice-theoretic construction of subjective probability does not apply to preferences, like those in the Ellsberg Paradox, that reflect a distinction between risk and ambiguity. We formulate two representation results—one for expected utility, the other for probabilistic sophistication—that derive subjective probabilities but only on a “small” domain of risky events. Risky events can be either specified exogenously or in terms of choice behavior; in the latter case, both the values and the domain of probability are subjective. The analysis identifies a mathematical structure—called a mosaic—that is intuitive for both exogenous and behavioral specifications of risky events. This structure is weaker than an algebra or even a λ-system. 相似文献
148.
149.
We study Neyman–Pearson testing and Bayesian decision making based on observations of the price dynamics (Xt:t∈[0,T]) of a financial asset, when the hypothesis is the classical geometric Brownian motion with a given constant growth rate and the alternative is a different random diffusion process with a given, possibly price-dependent, growth rate. Examples of asset price observations are introduced and used throughout the paper to demonstrate the applicability of the theory. By a rigorous mathematical approach, we obtain exact formulae and bounds for the most common statistical characteristics of testing and decision making, such as the power of test (type II error probability), the Bayes factor and its moments (power divergences), and the Bayes risk or Bayes error. These bounds can be much more easily evaluated than the exact formulae themselves and, consequently, they are useful for practical applications. An important theoretical conclusion of this paper is that for the class of alternatives considered neither the risk nor the errors converge to zero faster than exponentially in the observation time T. We illustrate in concrete decision situations that the actual rate of convergence is well approximated by the bounds given in the paper. 相似文献
150.
As companies move from one stage of their cycle to the next, they often have to revamp their skills and build innovative capabilities to survive, achieve profitability, and stimulate growth. Corporate entrepreneurship (CE) activities give these firms a foundation for building and exploiting these capabilities. In turn, stimulating and sustaining CE requires the infusion of resources and new knowledge into the firm's operations, using multiple external sources. In this paper, we highlight the importance of boards of directors and absorptive capacity for gaining access to varied and current knowledge that enriches CE. We suggest that boards and absorptive capacity complement each other in fueling CE activities. Further, boards can sometimes substitute for poor absorptive capacity and vice versa, influencing the intensity of CE activities. Managing these complementarities (or substitutions) is crucial for sustaining CE initiatives and creating value from them. 相似文献