做辅导关系的受益者

白手起家,创建起一家非常成功且令人羡慕的公司,并且拥有一个由一批异常优秀的人组成的忠诚的客户群,只需想想就令人惬意了。驰骋商场的历练,功成名就的洒脱,心之境界犹如马儿奔跑在茫茫草原,豁达宽广。更不必说,在一个用白色小篱     

Canonical vine copulas in the context of modern portfolio management: Are they worth it?

In the context of managing downside correlations, we examine the use of multi-dimensional elliptical and asymmetric copula models to forecast returns for portfolios with 3–12 constituents. Our analysis assumes that investors have no short-sales constraints and a utility function characterized by the minimization of Conditional Value-at-Risk (CVaR). We examine the efficient frontiers produced by each model and focus on comparing two methods for incorporating scalable asymmetric dependence structures across asset returns using the Archimedean Clayton copula in an out-of-sample, long-run multi-period setting. For portfolios of higher dimensions, we find that modeling asymmetries within the marginals and the dependence structure with the Clayton canonical vine copula (CVC) consistently produces the highest-ranked outcomes across a range of statistical and economic metrics when compared to other models incorporating elliptical or symmetric dependence structures. Accordingly, we conclude that CVC copulas are ‘worth it’ when managing larger portfolios.     

The Concept of Trust and the Political Economy of John Maynard Keynes,Illustrated Using Central Bank Forward Guidance and the Democratic Dilemma in Europe

Trust is an issue to which Keynesians and post-Keynesians have paid relatively little attention. However, properly understood it is an aspect of almost all activity, including key elements of socio-economic reality. Without trust, market exchange is at the very least problematic, if not impossible. Moreover, trust is intrinsic to a variety of issues with which Keynes, and subsequent Keynesianism have been concerned. In this paper we provide a general social theory conceptualisation of trust and then set out some of the areas where this concept resonates with the work of Keynes in terms of the role of conventions. Conventions quintessentially involve trust and that trust can be unstable, can be withdrawn and can require rebuilding. We illustrate this with reference to central bank policy and the Bank of England's introduction of Forward Guidance. Exploring the problem of trust in the context of banking also highlights a challenge for the continued relevance of Keynes' work. We now live in a neoliberal world and this provides a quite different context for state intervention than was previously the case. Keynes' work is now an argument for the alternative, and as such it requires more than a technical economic argument, it must also address the problem of trust in state policy-makers. We briefly illustrate the challenge this poses with reference to Europe.     

Manipulation in U.S. REIT Investment Performance Evaluation: Empirical Evidence

We investigate whether Real Estate Investment Trust (REIT) managers actively manipulate performance measures in spite of the strict regulation under the REIT regime. We provide empirical evidence that is consistent with this hypothesis. Specifically, manipulation strategies may rely on the opportunistic use of leverage. However, manipulation does not appear to be uniform across REIT sectors and seems to become more common as the level of competition in the underlying property sector increases. We employ a set of commonly used traditional performance measures and a recently developed manipulation-proof measure (MPPM, Goetzmann et al., Rev Finan Stud 20(5):1503–1546, 2007) to evaluate the performance of 147 REITs from seven different property sectors over the period 1991–2009. Our findings suggest that the existing REIT regulation may fail to mitigate a substantial agency conflict and that investors can benefit from evaluating return information carefully in order to avoid potentially manipulative funds.     

Categorical and continuous non-discretionary variables in data envelopment analysis: a comparison of two single-stage models

Non-discretionary or environmental variables are regarded as important in the evaluation of efficiency in Data Envelopment Analysis (DEA), but there is no consensus on the correct treatment of these variables. This paper compares the performance of the standard BCC model as a base case with two single-stage models: the Banker and Morey (1986a) model, which incorporates continuous environmental variables and the Banker and Morey (1986b) model, which incorporates categorical environmental variables. Simulation analyses are conducted using a shifted Cobb-Douglas function, with one output, one non-discretionary input, and two discretionary inputs. The production function is constructed to separate environmental impact from managerial inefficiency, while providing measures of both for comparative purposes. Tests are performed to evaluate the accuracy of each model. The distribution of the inputs, the sample size and the number of categories for the categorical model are varied in the simulations to determine their impact on the performance of each model. The results show that the Banker and Morey models should be used in preference to the standard BCC model when the environmental impact is moderate to high. Both the continuous and categorical models perform equally well but the latter may be better suited to some applications with larger sample sizes. Even when the environmental impact is slight, the use of a simple two-way split of the sample data can produce significantly better results under the Categorical model in comparison to the BCC model.     

What business are you in? Classic advice from Theodore Levitt

For all the talk about management as a science, experienced executives know that strategic decisions and tactics depend heavily on context. No one understood this better than Theodore Levitt (1925-2006). A Harvard Business School professor renowned as a founder of modern marketing, he sought above all to use his knowledge to serve the needs of businesspeople. In a series of powerfully insightful--and delightfully written--essays in Harvard Business Review, he provoked readers to reexamine their settled thinking about vital issues so that they could better meet the needs of customers. Levitt had the gifts of provocation and generalization, offering ideas that startled readers but compelled them to think creatively and intelligently about their companies. Writing in a period when business was held in far less esteem than it is today, he rejected the easy contempt that many intellectuals had for managers and consumers. Levitt carried that practical approach to his tenure at Harvard Business Review from 1985 to 1989. As one of HBR's most intellectual and most populist chief editors, he understood that the magazine's main purpose was to serve as a kind of sophisticated translation, clarifying authors' raw-and sometimes rough-ideas for impatient, time-pressed readers. This tribute, a look into one of business's great minds, offers excerpts from six of Levitt's most influential HBR articles: "Marketing Myopia" (July-August 1960) "After the Sale Is Over..."(SeptemberOctober1983) "Marketing Success Through Differentiation-of Anything" (January-February 1980) "Production-Line Approach to Service" (September-October 1972) "The Globalization of Markets" (May-June 1983) "Creativity Is Not Enough" (May-June 1963).     

Captivate Network and Elevator Telematics

Captivate Network, a US internet start-up, is the leading provider of elevator telematics: flat-screen panels displaying news and other content plus advertisements to people travelling in elevators. Telematics also has safety and operational applications. Growing fast in North America, the technology is now poised to expand to other technologically-advanced countries. It is a successful niche application of wireless internet technology and a new advertising medium in an industry which has changed little and is dominated by long-established big companies.     

Comparing the Impact of News: A Tale of Three Health Care Sectors

Abstract:   This paper examines the impact of news on the volatility of equity returns in three sectors of the health care industry – health care service providers, producers of drugs and supplies, and third‐party payors. The news impact is found to be asymmetric in that bad news (i.e., a negative shock) has a significantly greater effect on volatility than good news. Intra‐industry differences in health care equity market performance are documented and are consistent with the fundamental attributes of these sectors including the degree of price and cost pressures facing firms, the physical capital requirements of firms, the search behavior of health care customers, and the presence of alternative market opportunities.     

The Evaluation of Performance in Firms of Chartered Accountants

In this paper, the results are reported of a survey of the performance evaluation practices of six UK offices of four firms of chartered accountants. The objective of the study was to identify the variables which seemed likely to affect the perceived performance of chartered accountants in the UK. The study was conducted in three stages. First, a model was specified which identifies perceived performance as a function of perceived effort, perceived ability and perceived luck. Second, using a modified form of Vroom's expectancy model of motivation, the determinants of effort were identified. Finally, four work value factors were empirically derived and conceptually related to each of the variables in the model of performance and effort. The results suggest that two of the work value factors (the desire for a better quality of life and the desire to avoid uncertainty) may be particularly important.