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Long memory in volatilities of German stock returns 总被引:3,自引:0,他引:3
We show that there is strong evidence of long-range dependence in the volatilities of several German stock returns. This will be done by applying a method using the difference of the classical log-periodogram regression estimator for the memory parameter and of the tapered periodogram based estimator. Both estimators give similar values for the memory parameter for each series and this indicates long memory. To support our findings we apply also a methodology using the sample variance and a wavelet based estimator to the data. Also these two methods show clear evidence of long-range dependence in the volatilities of German stock returns.First version received: December 2001/Final version received: March 2003The computational assistance of Eleni Mitropoulou and Björn Stollenwerck as well as the helpful comments of two unknown referees are gratefully acknowledged. Research supported by Deutsche Forschungsgemeinschaft under SFB 475. Stock returns were obtained from Deutsche Finanzdatenbank (DFDB), Karlsruhe. 相似文献
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Monetary policy and financial markets are intrinsically linked. Central banks conduct monetary policy by influencing financial
market prices. Financial market prices reflect the expectations of market participants about future economic and monetary
developments. Monetary policy works primarily through expectations. Transparency and credibility render monetary policy more
effective. However, they are no substitutes for action. If a credible central bank uses words with the explicit aim of substituting
them for action, it will risk losing credibility. To avoid what has been described as “the dog chasing its tail” problem,
central banks must exercise caution in basing their monetary policy decisions on financial market information. The information
about expected future developments reflected in market prices must be continuously cross-checked against economic and monetary
indicators in what amounts to a “checks and balances” approach to monetary policy. 相似文献
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Intellectual property infringements rank among the top economic crimes, even though there are mechanisms in place to prevent their occurrence. One such mechanism are nondisclosure agreements, which, however, have been reported to fail in practice. This article argues that this may be overcome by strengthening employees’ concept learning. In an experiment, we investigated whether extended nondisclosure agreements, which provide the employee with detailed explanations and examples, lead to better recognition of trade secrets as compared to a standard nondisclosure agreement or no agreement at all. It was found that the extended nondisclosure agreement indeed increased participants’ ability to judge what falls under the trade secret law, whereas the standard nondisclosure agreement showed no such effect. Furthermore, the effects of the factors ‘Involvement’, ‘Specificity’, ‘Publicity’, and ‘Purpose’ on the identification of trade secrets could be proven experimentally. Employees’ judgments of whether an information represents a trade secret seem to rely on general cognitive processes. From this follows that concept learning could be integrated into systematic approaches for protecting intellectual property. 相似文献
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E. F. Philipp 《De Economist》1938,87(1):386-387
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In this paper, we derive a new effect of trade liberalization on the quality of the environment. We show that in the presence of heterogeneous firms, the aggregate volume of emissions is influenced by a reallocation effect resulting from an increase in the relative size of more productive firms. The relative importance of this reallocation effect and the scale effect well‐known from the literature is affected by the emission intensity at the firm level. Domestic emissions decrease as a result of a unilateral tariff reduction if and only if firm‐specific emission intensity decreases strongly with increasing firm productivity. As a result of the induced change in foreign emissions, domestic pollution can increase even if domestic emissions decrease. 相似文献
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Philipp Engler Terhi Jokipii Christian Merkl Pablo Rovira Kaltwasser Lúcio Vinhas de Souza 《Empirica》2007,34(5):411-425
This paper analyzes the role of banks’ regulatory capitalization in the transmission of monetary policy. We use a confidential
dataset for Austrian banks spanning from the first quarter of 1997 to the fourth quarter of 2003. We find evidence that Austrian
banks react in an asymmetric way to monetary policy depending on their regulatory excess capitalization, i.e. low capitalized
banks react more restrictively to a monetary tightening than their highly capitalized peers.
相似文献
Lúcio Vinhas de SouzaEmail: |
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Matthijs J. H. M. van der Loos Philipp D. Koellinger Patrick J. F. Groenen Cornelius A. Rietveld Fernando Rivadeneira Frank J. A. van Rooij Andr�� G. Uitterlinden Albert Hofman A. Roy Thurik 《Small Business Economics》2011,37(3):269-275
Candidate gene studies of human behavior are gaining interest in economics and entrepreneurship research. Performing and interpreting these studies is not straightforward because the selection of candidates influences the interpretation of the results. As an example, Nicolaou et al. (Small Bus Econ 36:151?C155, 2011) report a significant association between a common genetic variant in the DRD3 gene and the tendency to be an entrepreneur. We fail to replicate this finding using a much larger, independent dataset. In addition, we discuss the candidate gene approach and give suggestions to avoid the publication of false positives. 相似文献