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Buying and selling stocks causes price changes, which are described by the price impact function. To explain the shape of this function, we study the Island ECN orderbook. In addition to transaction data, the orderbook contains information about potential supply and demand for a stock. The virtual price impact calculated from this information is four times stronger than the actual one and explains it only partially. However, we find a strong anticorrelation between price changes and order flow, which strongly reduces the virtual price impact and provides for an explanation of the empirical price impact function. 相似文献
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Magnus Weber 《Journal of Risk Research》2018,21(7):914-931
This paper addresses the expansion of risk practices through a case study of a government led project in Sweden purposed to develop a method to include social events in mandatory risk practices. Social heterogeneity was to be transformed into straightforward causality in order to turn the social into a manageable object. In this regard, the project was quite successful. By inviting social scientists into the process, otherwise often marginalized within risk practice, causality and quantifiable risk factors could be established and the model became a rigorous and legitimate scientific model. Although experts were granted significant autonomy and became experts far beyond their own area of expertise, the success of the model lies rather in allowing experts authority within confined boundaries. Grand narratives and critical perspectives are disregarded as too abstract and if social scientists are to infuse aspects of social critique they must adapt to these circumstances: they must become instrumentalists. 相似文献
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Abstract. This paper reports the results of an experiment on portfolio choice in the presence of non-tradable income. The non-tradable income part could either be riskless or risky (background risk). In many cases, we observe behavior that is qualitatively consistent with the predictions of normative theory. However, correlations between financial and non-tradable wealth are neglected. The computation of aggregated risk profiles helps subjects to partly overcome the deviations from normative theory due to neglect of correlations. 相似文献
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