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91.
A sizeable percentage of investors are using social media to obtain information about companies (Cogent Research [2008]). As a consequence, social media content about firms may have an impact on stock prices (Hachman [2011]). Various studies utilize social media content to forecast stock market-related factors such as returns, volatility, or trading volume. The objective of this article is to investigate whether a bidirectional intraday relationship between stock returns and volatility and tweets exists. The study analyzed 150,180 minute-by-minute stock price and tweet data for the 30 stocks in the Dow Jones Industrial Average over a random 13-day interval from June 2 to June 18, 2014 using a BEKK-MVGARCH methodology. Findings indicate that 87% of stock returns are influenced by lagged innovations of the tweets data, but there is little evidence to support that the direction is reciprocal, with only 7% of tweets being influenced by lagged innovations of the stock returns. Results further show that the lagged innovations from 40 percent of stock returns affect the current conditional volatility of the tweets, while 73 percent of tweets affect the current conditional volatility of stock returns. Moreover, there is strong evidence to suggest that the volatility originating from the returns to the tweets persists for 33 percent of stocks; the volatility originating from the tweets to the returns persists for 73 percent of stocks. Last, 53 percent of stocks exhibit both immediate and persistent impacts from returns to tweets, while 90 percent of stocks exhibit both immediate and persistent impacts from tweets to returns. These results may help traders achieve superior returns by buying and selling individual stocks or options. Also, asset and mutual fund managers may benefit by developing a social media strategy. 相似文献
92.
Oliver Breiden Alexander T. Mohr Hafiz R. Mirza 《International Journal of Human Resource Management》2013,24(11):1907-1925
We develop and empirically test a model of expatriate managers' work adjustment. In this model we relate the fit between work-related abilities and needs of expatriate managers as well as the fit between the job requirements of, and incentives associated with, an international assignment to the level of expatriate managers' work adjustment. We test this model with data gathered by means of an electronic survey among 118 German expatriate managers. The empirical findings largely support our theoretical model. The paper enhances our understanding of expatriate managers' work adjustment and its antecedents and contributes to the theoretical and empirical basis of research into expatriate management. 相似文献
93.
Overtime Work and Overtime Compensation in Germany 总被引:1,自引:0,他引:1
Sharing the available stock of work more fairly is a popular concern in the public policy debate. One policy proposal is to reduce overtime work in order to allow the employment of more people. This paper suggests that such a concept faces major problems. Using Germany as a case study, it is shown that the group of workers with the highest risks of becoming unemployed, namely the unskilled, also exhibit low levels of overtime work. Those who work overtime, namely the skilled, face excess demand on the labour market. Since skilled and unskilled workers are largely complements in production, a general reduction in overtime will lead to less production and hence also to a decline in the level of unskilled employment. The paper provides empirical support for this line of argument. It is also shown that paid overtime work has lost relative importance over time. 相似文献
94.
95.
We present three scenarios concerning access to documents in three real world fields of application, which have in common that they are very difficult to support with classical anticipative access control systems. We show, how - based on a highly configurable notification and negotiation service, which is tightly integrated with a classical access control system - the common permission and denial options can be extended with awareness and negotiation and how this approach supports the three initial access scenarios. We also introduce our implementation of the notification and negotiation service in the PoliTeam project. 相似文献
96.
Tim Lloyd Oliver Morrissey & Geoffrey Reed 《Economic journal (London, England)》1998,108(447):458-476
Intervention analysis is proposed as a method for estimating the effects of anti-dumping actions in the presence of a domestic cartel. Data requirements and modelling effort compare favourably with traditional structural model approaches. The method is applied to an anti-dumping action brought to the European Commission and in which the European producers of the product were fined after an anti-cartel action by the Commission covering an overlapping period. Interven tion analysis is applied to distinguish the effects of the anti-dumping action from those of changes in cartel behaviour 相似文献
97.
Brand managers strive to achieve an outstanding position in the psyche of the user by differentiating the product and service. In order to do so, brands are now often promoted by communications that focus on a trivial attribute difference. The current study tests both how the use of such an irrelevant attribute affects the perceptions of the consumer and how they rate the brand when the irrelevance of the attribute is previously revealed. The results of a controlled experiment (n = 894) show that the use of irrelevant attributes generally has a positive effect on buying behavior and that this effect is obtained even when the actual irrelevance is previously proven to the consumer. Further, the results are consistent across a variety of outcome variables, including attention, perceived uniqueness, price fairness, attitude toward the brand, and intention to buy the brand. © 2010 Wiley Periodicals, Inc. 相似文献
98.
Oliver E. Williamson 《Economic Affairs》2008,28(3):7-14
Theories commonly progress through four stages, from informal to pre‐formal to semi‐formal and fully formal. This paper reports on the earliest stage of transaction cost economics that extended from the 1920s to the 1970s. That the gestation stage lasted so long is partly because transaction cost economics departed significantly from the then‐prevailing economic orthodoxy. Also, and related, it is an interdisciplinary undertaking. As reported herein, transaction cost economics selectively combines economics, organisation theory and law and is the product of the contributions of some of the finest minds in those three fields. 相似文献
99.
Oliver Kopplin 《Heilberufe》2008,60(2):28-30
Zusammenfassung Eine Rollstuhlanpassung in fünf Akten — K?nnen Sie sich Ihren Arbeitsalltag ohne den Rollstuhl vorstellen? Sicher nicht. Doch
allzu oft kommt der n?chstbeste Stuhl zum Einsatz – ungeachtet der K?rperma?e der Person, die ihn benutzen soll und die dann
eher schlecht als recht darin sitzt. Doch schon kleinste Ver?nderungen an Rücklehne oder Sitzposition k?nnen Ihrem Patienten
helfen. Oliver Kopplin gibt Pflegekr?ften Tipps, worauf sie bei Patienten im Rollstuhl achten sollten. 相似文献
100.