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排序方式: 共有221条查询结果,搜索用时 15 毫秒
41.
Abstract: Current research suggests that the large downside risk in hedge fund returns disqualifies the variance as an appropriate risk measure. For example, one can easily construct portfolios with nonlinear pay-offs that have both a high Sharpe ratio and a high downside risk. This paper examines the consequences of shortfall-based risk measures in the context of portfolio optimization. In contrast to popular belief, we show that negative skewness for optimal mean-shortfall portfolios can be much greater than for mean-variance portfolios. Using empirical hedge fund return data we show that the optimal mean-shortfall portfolio substantially reduces the probability of small shortfalls at the expense of an increased extreme crash probability. We explain this by proving analytically under what conditions short-put payoffs are optimal for a mean-shortfall investor. Finally, we show that quadratic shortfall or semivariance is less prone to these problems. This suggests that the precise choice of the downside risk measure is highly relevant for optimal portfolio construction under loss averse preferences. 相似文献
42.
Siem Jan Koopman Roman Kräussl André Lucas André B. Monteiro 《Journal of Empirical Finance》2009,16(1):42-54
We use an intensity-based framework to study the relation between macroeconomic fundamentals and cycles in defaults and rating activity. Using Standard and Poor's U.S. corporate rating transition and default data over the period 1980–2005, we directly estimate the default and rating cycle from micro data. We relate this cycle to the business cycle, bank lending conditions, and financial market variables. In line with earlier studies, the macro variables appear to explain part of the default cycle. However, we strongly reject the correct dynamic specification of these models. The problem is solved by adding an unobserved dynamic component to the model, which can be interpreted as an omitted systematic credit risk factor. By accounting for this latent factor, many of the observed macro variables loose their significance. There are a few exceptions, but the economic impact of the observed macro variables for credit risk remains low. We also show that systematic credit risk factors differ over transition types, with risk factors for downgrades being noticeably different from those for upgrades. We conclude that portfolio credit risk models based only on observable systematic risk factors omit one of the strongest determinants of credit risk at the portfolio level. This has obvious consequences for current modeling and risk management practices. 相似文献
43.
ABSTRACTGiven theoretical premises, the gender-wage gap adjusted for individual characteristics is likely to vary according to age. This study adapts John DiNardo, Nicole M. Fortin, and Thomas Lemieux's (1996) semi-parametric technique to disentangle year, cohort, and age effects in adjusted gender-wage gaps. The study relies on a long panel of data from the German Socio-Economic Panel (SOEP) covering 1984–2015. The results indicate that, in Germany, the gender-wage gap increases over a birth cohort's lifetime, including in the post-reproductive age for some birth cohorts. The results suggest that age and gender are overlapping handicaps in the labor market and call for a policy intervention. 相似文献
44.
This article analyzes the impact of the supply of skilled and unskilled labor on the growth rate of open economies. Using an expansion-in-varieties framework, the model distinguishes between a long-term equilibrium and a medium-term adjustment path. It is demonstrated that the dynamic effects of labor supply are different in a model with expanding varieties in the consumption sector from those in a model with expanding varieties in the production sector. In addition, the outcome depends on the elasticities of substitution in production as well as the countries' production shares in world goods markets. It is shown that, in general, the supply of unskilled labor is likely to have an unfavorable effect on long-term development. 相似文献
45.
Lucas Bretschger 《Journal of Economics》2001,73(3):247-274
This paper examines the relation between industrial mix, trade, and regional productivity growth. For this purpose, a dynamic model of the open economy with diversified sectoral knowledge formation and incomplete interregional knowledge diffusion is constructed. The theoretical framework is first used to show the consequences of increasing globalization on regional growth. It is then applied to German regional data in order to investigate whether there is evidence of generally specified patterns of knowledge formation. It emerges that some causal relationships are robust for the case of German regions but cannot be exploited by economic policy in general. 相似文献
46.
Portfolio Choice in the Presence of Background Risk 总被引:2,自引:0,他引:2
In this paper, we focus on how the presence of background risks – from sources such as labour and entrepreneurial income – influences portfolio allocations. This interaction is explored in a theoretical model that is calibrated using cross-sectional data from a variety of sources. The model is shown to be consistent with some but not all aspects of cross-sectional observations of portfolio holdings. The paper also provides a survey of the extensive theoretical and empirical literature on portfolio choice. 相似文献
47.
The paper explains how an important opportunity exists to pro-actively integrate suppliers at an early stage in the concept exploration and definition stages of product development. Research suggests that the concept of architectural innovation can be extended so that product features are matched with the associated specialized technical skills of partners in the development team.
In addition to the establishment of integrated product teams, key enablers include: long-term commitment to suppliers; co-location; joint responsibility for design and configuration control; seamless information flow; and retaining flexibility in the definition of system configuration. Important contributing factors include: supplier-capability-enhancing investments; target costing; and incentive mechanisms. To promote innovative outcomes in military and government programmes, attention is drawn to the importance of governments championing closely-knit customer-supplier relationships.
Firms can build enduring competitive strength by leveraging the specialized knowledge bases of their supplier networks. Two case-studies provide lessons to improve current approaches to the creation of long-term partnerships, or strategic alliances, with suppliers. 相似文献
In addition to the establishment of integrated product teams, key enablers include: long-term commitment to suppliers; co-location; joint responsibility for design and configuration control; seamless information flow; and retaining flexibility in the definition of system configuration. Important contributing factors include: supplier-capability-enhancing investments; target costing; and incentive mechanisms. To promote innovative outcomes in military and government programmes, attention is drawn to the importance of governments championing closely-knit customer-supplier relationships.
Firms can build enduring competitive strength by leveraging the specialized knowledge bases of their supplier networks. Two case-studies provide lessons to improve current approaches to the creation of long-term partnerships, or strategic alliances, with suppliers. 相似文献
48.
While small and medium enterprises contribute to gross domestic product, generate crucial employment, and improve socio-economic development, unfortunately the literature on the internationalization processes of these companies remains timid and inconsistent. The following study seeks to analyze the international expansion of the Colombian company Inducascos. The research follows the structure of a case study including literature analysis and secondary data of the Colombian industrial market and Inducascos. Challenges, opportunities and learning process of the organization related to its international expansion and set out, seeking to contribute to the existing studies in international business. 相似文献
49.
Cristina Galamba Marreiros Andreia Dionísio Maria Raquel Lucas 《International Journal of Consumer Studies》2021,45(1):1-13
The main goal of this paper is to evaluate the possibility of finding international consumer segments in the organic food product (OFP) market. For that purpose, the power of country of residence in discriminating between urban frequent, occasional and non‐consumers of OFP was evaluated; and the most appropriate international segmentation bases for that market were studied. In order to achieve this goal, a survey of organic food consumers from Lisbon (Portuguese) and Berlin (German) was implemented through a structured questionnaire. Upon this, factorial and discriminant analysis was applied to the data. The results highlight the significance of the “Country” variable when distinguishing between groups of urban OFP consumers and non‐consumers as well as between frequent and occasional urban OFP consumers. The different levels of OFP consumption are mostly explained by the level of declared “OFP knowledge”. Therefore, we can conclude that in order to increase the consumption of OFP and dilute the effect of the country variable and to be able to work with international segments, marketers should aim to increase awareness and knowledge on these products. It is important to mention that this study was based on a non‐probabilistic sample and, consequently, generalizations of its conclusions must be made with care. 相似文献
50.
We explore data from all transition economies over nearly two decades, providing insights on the mechanisms behind labor force reallocation. We show that worker flows between jobs in different industries are rare relative to the demographic flows of youth entry and elderly exit. The same applies to the flows between state-owned enterprises and private firms. In fact, evidence suggest that changes in the demand for labor were accommodated mostly through demographic flows, with a smaller role left for job transitions. We also show that the speed of changing the ownership structure in the economy has driven exits to retirement, in particular the early exits. 相似文献