共查询到19条相似文献,搜索用时 15 毫秒
1.
Sylvie Tissot 《International journal of urban and regional research》2014,38(4):1181-1194
This article centers on a group of upper‐middle‐class gentrifiers living in a neighborhood in the South End of Boston, and their complex attitude towards diversity. I use data from my fieldwork in the South End, based on ethnographic observation and 77 interviews with residents active in local organizations, such as neighborhood associations. These residents explicitly stress their endorsement of diversity, in terms of class, race, but also sexual orientation, and their commitment to maintaining it. I examine the meaning they give to this principle, the actions they take in its name and the kind of relations they establish with those ‘others’ who embody such diversity. I argue that the gentrifiers' love of diversity, which cannot be reduced to sheer hypocrisy, is intrinsically linked to their capacity to control it, thus shedding light on the changing definition of social distinction in upper‐middle‐class culture. 相似文献
2.
根据风险价值VaR的计算思路,本文提出了基于GARCH理论的风险计量投资组合优化模型;同时在修正的VaR——尾条件期望的基础上对证券组合投资的优化模型做了进一步的改进。 相似文献
3.
4.
Nathan Marom 《International journal of urban and regional research》2014,38(4):1344-1362
This article advances a conceptualization of spatial distinction that, following Bourdieu, relates principles of division in ‘social space’ with formations of segregation in urban space. It applies this interpretive framework to concisely narrate the one hundred years' history of spatial distinction in Tel Aviv. Analyzing five moments in the city's development, it focuses on a dominant principle of distinction in each period and its ensuing segregations: predominantly ethno‐national (Jewish–Arab) distinction that established Tel Aviv in opposition to Jaffa at the turn of the twentieth century; nuanced ethno‐class distinction that shaped the city's rapid growth in the 1920s–30s and created an elaborate socio‐spatial hierarchy of neighborhoods; institutionalized distinction that governed the collective supply of housing in the 1930s–40s, evolving into a complex system of housing classifications; ‘distinction‐by‐distance’ through exclusive suburbanization and the emergence of a metropolitan scale of distinction in the 1950s–70s; and a ‘back‐to‐the‐center’ strategy of distinction by way of gentrification in the 1980s–90s and within gated residential enclaves at the beginning of the twenty‐first century. Through this concise history, various principles, mechanisms and scales of spatial distinction are elaborated upon, as a way to think about the socially constructed, historically contingent and continuously changing divisions and segregations in cities. 相似文献
5.
David J. Madden 《International journal of urban and regional research》2014,38(2):471-497
This article argues for a reconceptualization of one of the most basic concepts in urban studies: the neighborhood. Traditionally neighborhoods have been understood as clearly bounded, quasi‐Westphalian containers or as ‘natural areas’ of urban community. But this approach is widely acknowledged to be under‐theorized. And it fails to account for the ways in which the production of neighborhood is inherently political and often conflictual. After reviewing the ways in which neighborhood has been used in urban sociology and urban planning, this article offers a critical conception of neighborhoods as ‘spatial projects’ on the submetropolitan scale. This approach captures the ways in which neighborhoods are not abstract spaces on a city map, but the uneven, unequal products of complex, ongoing struggles between various groups and institutions. This approach is developed through an ethnographic and historical case study of neighborhood formation in one part of Brooklyn, New York. The article concludes with a discussion of how the language of spatial projects refocuses urban research on the political and economic forces that produce neighborhood in the contemporary city. 相似文献
6.
7.
Marco Rocco 《Journal of economic surveys》2014,28(1):82-108
Extreme value theory is concerned with the study of the asymptotic distribution of extreme events, that is to say events which are rare in frequency and huge in magnitude with respect to the majority of observations. Statistical methods derived from it have been employed increasingly in finance, especially for risk measurement. This paper surveys some of those main applications, namely for testing different distributional assumptions for the data, for Value‐at‐Risk and Expected Shortfall calculations, for asset allocation under safety‐first type constraints, and for the study of contagion and dependence across markets under conditions of stress. 相似文献
8.
企业与供应商合作存在信息不对称的情况,为有效的做出决策,企业根据道德风险的特征确定风险因子,建立价值评估模型,以供应商的历史表现为依据,进行道德风险价值评估,从而决定是与供应商合作,还是考虑采取预警、防范或其它相关措施.通过实例计算分析.说明理论方法的可行性和有效性. 相似文献
9.
金融时间序列具有分布的厚尾性、波动的集聚性等特征,传统的方法难以准确的度量其风险。文中运用一种新的估计VaR和ES的方法,即采取两阶段法。首先用GARCH-M类模型(GARCH-M、EGARCH-M和TGARCH-M)拟和原始收益率数据,得到残差序列;第二步用极值分析的方法分析的尾部,最后得到收益率序列的动态VaR和ES。最后对三个模型的计算结果进行比较。 相似文献
10.
本文将条件风险价值理论用于原油采购中,通过构建线性规划模型,达到在满足收益要求的条件下控制潜在风险的目的,最后进行了算例分析,结果对企业原油采购有一定指导意义。 相似文献
11.
《Journal of Transnational Management》2013,18(2):43-59
Abstract This paper studies the difference in global equity portfolios allocated by the criterion of minimizing the risk by using two different risk measures, the standard deviation and the conditional value at risk. An empirical analysis is performed on a comprehensive stock exchange database. The main hypothesis of the present work is that the choice of risk measure has crucial importance in portfolio optimisation, especially in those situations when the stock markets are extremely volatile and the return distributions are non-normal. The rationale behind establishing minimum-risk portfolios is to keep track of the highest possible risk reduction benefits from international diversification. 相似文献
12.
13.
We study a non-traditional cooperative game where returns from coalitions are nondeterministic. The long-standing concept of core can be generalized to reflect players’ contentment with their allocations. It is now imperative to formalize the restrictions, such as those pertaining to information, on allocations. The latter are also at times more conducive to fractional representations. With probabilistic structures added, nondeterministic returns become random variables, utility functions attain risk-attitude connotations, and the timing of players’ allocation resolutions gains significance. Under various conditions for utility functions, we show how various core concepts of the general game can be related to its traditionally defined auxiliaries. These developments help pave the way for our illustrations, within two distinct settings, that players’ increased risk aversion would promote the formation of the grand coalition. 相似文献
14.
We analyze the degree of mutual excitation that exists between extreme events across the stock markets of OECD member nations and the Brent and WTI crude oil markets. For this analysis, marked point process models are proposed which are able to capture the dynamics of the intensity of occurrence and comovement during periods of crisis. The results show a significant, negative interdependence between most OECD markets, especially those of the USA, Japan and France. These major oil importing countries display links between equity market losses and positive returns in both oil markets. However, positive interdependence is not observed between any of the OECD countries except for South Korea. The great advantage of this methodology is that, apart from using the size distribution of extreme events, it also uses the occurrence times of extreme events as a source of information. With this information, these models are better able to capture the stylized facts of extreme events in financial markets such as clustering behavior and cross-excitation. 相似文献
15.
16.
《International Journal of Forecasting》2023,39(1):314-331
Is univariate or multivariate modeling more effective when forecasting the market risk of stock portfolios? We examine this question in the context of forecasting the one-week-ahead expected shortfall of a stock portfolio based on its exposure to the Fama–French and momentum factors. Applying extensive tests and comparisons, we find that in most cases there are no statistically significant differences between the forecasting accuracy of the two approaches. This result suggests that univariate models, which are more parsimonious and simpler to implement than multivariate factor-based models, can be used to forecast the downside risk of equity portfolios without losses in precision. 相似文献
17.
Seongtae Kim Stephan M. Wagner Claudia Colicchia 《Journal of Supply Chain Management》2019,55(1):71-87
Business scandals like sweatshop labor have received growing attention in the field of supply management. Yet little is known about how detrimental such scandals are to buying firms. This study aims to fill this gap by examining the magnitude of the consequences of what are termed as supplier sustainability risks (SSRs). To this end, we conduct an event study analysis followed by regression modeling based on a sample of 196 U.S. publicly traded firms’ SSRs. The results reveal that SSRs are associated with a 1.00 percent reduction in shareholder wealth. The market reacts negatively but not differently to the two types of SSR: process‐related risks and product‐related risks. Finally, a firm's moral capital does play a mitigating role for SSRs and process‐related risks; however, it does not provide insurance‐like protection for product‐related risks. 相似文献
18.
David R. Cox 《Revue internationale de statistique》2015,83(3):339-356
Editors' Note: This conversation covers the extensive contributions of John C. Gower to statistical methodology, computing and applications. It also touches on the pioneering development of statistical computing at Rothamsted Experimental Station and the relevant work of Frank Yates, John Nelder and others who were at Rothamsted. See also the accompanying paper by John Gower (1985) on developments in statistical computing at Rothamsted (see Note 1) and the epilogue from Roger Payne. 相似文献
19.
Roland Clre 《Journal of International Financial Management & Accounting》2019,30(3):223-249
In this article, we discuss the impact of financial debt on shareholder value using a new approach that aims: (a) to explain the effect that leverage from debt has on a stock’s systematic risk, or what we shall call here “the systematic cost of leverage,” and (b) to account for default risk in the cost of equity, or what we shall call here “the cost of default.” Our assessment of systematic risk is based on a stochastic approach that is materially different from the one proposed by Hamada: the risk premium remunerates the investor for the probability of equity (expressed as market value) generating a return below that of the risk‐free rate. Furthermore, the approach we use to account for default risk is derived from reduced‐form models, but in this case, (a) we use real probabilities of default and not risk‐neutral probabilities, and (b) we extend the approach to stocks. 相似文献