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The examples that are reported in the famous chapter “On Machinery” added by Ricardo in the third edition of his Principles are reconstructed and analyzed. Two sets of assumptions that rationalize the examples presented by Ricardo are identified: a) the innovation concerns an agricultural commodity and does affect neither which land is marginal nor the technology applied on the marginal land; b) the innovation concerns a non-basic commodity. Ricardo was aware of these two facts and he seems to have used them respectively in the first and second of his examples.  相似文献   
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Two experiments examined the effects of iterated polling and feedback on prediction accuracy for volatile world events using the Delphi paradigm. In both experiments, participants predicted rapidly changing geopolitical events. The first experiment occurred during the litigation surrounding the Clinton/Lewinsky affair in 1998. Results indicated that feedback improved individual and group accuracy for predictions of whether an event would occur. These types of predictions derived from group consensus were approximately 90% accurate, which was significantly higher than the average individual participant's accuracy. Neither polling nor feedback had much effect on time course predictions. The second experiment occurred during the American military action against the Taliban regime in Afghanistan in 2001. In Experiment 2, participants were polled three times to determine if increasing the number of iterated polls would improve Delphi accuracy. The results showed that accuracy improved from the first to the second poll but not from the second to the third. The groups predicted whether these scenarios would occur with approximately 75% accuracy, which was significantly higher than the accuracy of any individual participant. Once again, the Delphi procedure did not enhance time course predictions in Experiment 2.  相似文献   
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The existing studies of foreign direct investment and the corresponding technological diffusion process that they generate, focus either on specific parameters of the production process in isolation, or they combine certain parameters to construct indices that are not consistent across studies. The present analysis proposes an alternative approach that captures the entire production process and multinational firms are viewed as the platform that transfers more advanced technologies to the host countries. As multinational firms are able to utilise more efficiently the available production process, an efficiency gap ensues between the domestically owned firms of a country and the multinational firms that operate in it. We capture and provide a measure and a monitoring mechanism of the technological diffusion process via foreign direct investment through the evolution of the efficiency gap between the two groups of firms whilst controlling for other variables that might contribute to such a gap. We apply our approach to the manufacturing sector of the Greek economy that experiences a consistent presence of foreign direct investment inflows over the time period 2001–2007.  相似文献   
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In this article, the authors explore consensus among economists on specific propositions based on a fall 2011 survey of American Economic Association members. Results are based on 568 responses and provide evidence of changes in opinion over time by including propositions from earlier studies in 2000 (Fuller and Geide-Stevenson 2003) and 1992 (Alston, Kearl, and Vaughan 1992). Propositions focus on microeconomics, macroeconomics, distributional and international topics, as well as pedagogy. Results indicate a movement toward an overall higher level of consensus, mainly because of a drop in the incidence of no consensus. Especially in the area of distributional propositions, economists display an increased concern with income inequality and potential effects on growth. In the area of macroeconomics, current opinions are more similar to those of the 1992 survey than the 2000 survey.  相似文献   
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Contrary to the argument that radical innovation is only compatible with institutional arrangements characteristic of liberal market economies, this paper shows how state-led economies successfully organize their innovation systems to promote radical innovation with a comparative analysis of two dirigiste states, France and Korea. The authors further analyse how government policies under similar institutional arrangements drive different trajectories of radical innovation, as illustrated by their relative competitiveness in the ICT sector. The two dirigiste economies have undergone substantial institutional changes adapting to globalization but sustained state initiatives in coordinating their relationship-based innovation systems, reinforcing the cooperation among the state, academia and industry.  相似文献   
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This article presents four scenarios depicting science and technology (S&T) management dilemmas of the next two decades. The scenarios concern the balance between risk and promise, between the need to steer the directions of S&T, to minimize risk, and the need to maintain a free and unconstrained S&T agenda. These scenarios were constructed in the third year of the Millennium Project's study of this topic. The scenarios were formed in an interactive process with the project's international participants. The key policies that were found to be useful in all of the scenarios include (1) when considering the possibility of the misuse of weapons of mass destruction by terrorists, include the possibility of misuse by a single individual, acting alone; (2) establish mechanisms and techniques for making possible the explicit unintended consequences of scientific research and technology, including malicious uses; (3) for desirable technologies, where it may not be possible to avoid significant risks, develop mitigation strategies in parallel; (4) teach science ethics.  相似文献   
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