Improved instrumental variables estimation of simultaneous equations under conditionally heteroskedastic disturbances

In this paper we develop estimation techniques and a specification test for the validity of instrumental variables allowing for conditionally heteroskedastic disturbances. We propose modified two‐stage least squares (2SLS) and modified 3SLS procedures where the conditional heteroskedasticity is taken into account, which are natural extensions of the traditional 2SLS and 3SLS estimators and which achieve a lower variance. We recommend the use of these modified 2SLS and 3SLS procedures in practice instead of alternative estimators like limited‐information maximum likelihood/full‐information maximum likelihood, where the non‐existence of moments leads to extreme values, and also for ease of computation. It is shown theoretically and with simulation that in some cases 2SLS, 3SLS and our modified 2SLS and 3SLS procedures can have very severe biases (including the weak instruments case), and we present bias correction procedures to apply in practice along the lines of Flores‐Lagunes ( 2007 ). Our new estimation procedures can also be used to extend the test for weak instruments of Stock and Yogo ( 2005 ) and to allow for conditional heteroskedasticity. Finally, we show the usefulness of our estimation procedures with an application to the demand and supply of fish. Copyright © 2010 John Wiley & Sons, Ltd.     

Assessing value-in-use: A conceptual framework and exploratory study

Developing approaches for understanding customer perceived value is a priority for managers and scholars alike. A conceptual framework for assessment of value-in-use is proposed and explored within the context of a maintenance service provider. In contrast to value models in previous empirical research, the framework includes assessment not just of provider attributes but also of the customer's usage processes, as well as customer evaluations of the value-in-use they obtain. Interviews with members of a cross-disciplinary buying group provide support for the framework, including the observations that individuals can assess the quality of their usage processes and that they can articulate value-in-use at both organisational and individual levels; the further concept of network quality also emerges from the data. Assessment of usage process quality as well as service quality evolves as the customer's goals evolve. Practitioners may wish to elicit usage process quality and value-in-use as well as service quality. Research directions include scale development for both usage process quality and value-in-use.     

创新区域转移

目前全球关注的重点似乎集中在就业、生存、领导能力、技术水平,尤其是创新等方面。     

Identifying and evaluating adaptation strategies for cruise tourism in Arctic Canada

The cruise tourism industry in Arctic Canada has recently grown rapidly with stable numbers now emerging. While there are many socio-economic opportunities associated with growth, climate change, and environmental, technical and cultural risks also present significant management challenges. To enhance understanding of these opportunities and risks, this study adopted a policy Delphi approach to identify and evaluate potential adaptation strategies to aid decision-makers and policy-makers managing cruise tourism development and its associated impacts. Over 500 ideas were identified. These were distilled down to 65 potential adaptation options, which were evaluated for priority and feasibility by key stakeholders including local residents, tourism operators, and policy-makers. The majority of recommendations were evaluated as of high priority and most options were perceived to be somewhat affordable and implementable. Key needs included disaster management plans, updated technology and ship navigation systems, improved marine resource mapping, and the development of a code of conduct for cruise tourists to guide visitor behaviour and promote a sustainable approach. The research represents the first empirical study to identify and evaluate adaptation strategies for cruise tourism development in Arctic Canada and outlines current priorities, opportunities, and challenges associated with managing socio-economic change in Arctic Canada in sustainable ways.     

The effect of training on organizational performance: differences by age composition and cultural context

This paper examines the effects of two training-related measures (i.e. average days spent on training an employee per year and the extent of concentration) on three aspects of organizational performance: level of productivity, rate of innovation, and rate of turnover for organizations in Anglo, Germanic, Nordic, and Eastern European cultures, as defined by the Global Leadership and Organization Behavior Effectiveness project. Analysis of the 2004 Cranet survey data indicates that both training-related measures positively affected the level of productivity in Anglo nations, but that the effect of extent of concentration was smaller for organizations with older age profiles.     

“不专业”的500强董事会

正更要命的是,集团董事会成员严重缺乏经验。集团网站上公布的董事名单中,有一名护士和一个退了休的出版商。当选董事根本不用承担任何行政责任合作社集团(The Co-Operative Group)总部位于英国曼彻斯特是世界上最大的消费者合作组织之一。值得一提的是,它有自己的所谓"股票",但"股价"固定不变,也不能交易。消费者购买"股票"后成为会员,投资金额多少并不重要,再多的投资也不会增加其在英国合作社集团中的发言权。     

Second and higher moments of fundamentals: A literature review

This literature review outlines the recent progress in fundamental second and higher moments of research. We survey the moments’ existence, formation, and financial market and macroeconomic implications. Research shows that time‐varying volatility and non‐Gaussian shocks exist throughout all measures of fundamentals at both the micro‐ and macro levels. In addition, the granular network among firms helps explain the origin of fundamental second and higher moments. Empirical evidence shows that the moments have strong predictive power on asset prices and macroeconomic variables. We also highlight several areas where more research is needed to better understand the moments.