世界金刚石和金伯利岩产地概览(连载Ⅲ)

五、非洲的金刚石产地 随着西伯利亚和澳大利亚金刚石岩管矿床的投产，并于 1959～ 1985年达到高产时期，非洲在世界金刚石产量中的比重相对下降。总体而言，非洲一直是世界上最大的金刚石产区， 1889～ 1959年间，非洲的金刚石产量在世界上的地位举足轻重，占世界金刚石产量的     

What Enhances Insider Trading Profitability?

This study analyses the factors triggering insider trading profitability. Since there is not much evidence on this topic in the continental-European context, we focus on the Spanish stock market. Our findings show that the main relevant factors (the timing ability of the insider, the transparency of the transaction and the level of free cash flow of the firm) are related to insiders’ opportunities behaviour, motivated by the lack of either managerial control within the firm or enforcement of insider trading regulation. The level of ownership concentration, the spread and the interaction between the size and the transparency of the transaction are other relevant factors, some of them tested for the first time in the insider trading literature.      

Developing a framework for network and cluster identification for use in economic development policy-making

Drawing on extensive academic research concerning clusters and networks, this paper seeks to create a framework capable of reviewing and monitoring different aspects of clusters and networks on an ongoing basis. The nine-element framework allows evaluation of the structures and processes for the eight basic cluster types identified from the literature. The use of this framework as a complimentary tool to the Multi-sectoral Qualitative Analysis (MSQA) methodology is then demonstrated using three examples (the construction, hardwood timber and higher education sectors). The data was gathered from three sets of key stakeholders (government, institutions and industry) provided from a recent study funded by the Welsh Assembly Government's Small Grants Research Programme. These cases illustrate the use of the framework in helping to generate the initial information necessary for subsequent cluster development policy (within overall regional economic development) by government to occur. The framework provides tools for reviewing and monitoring individual sectors. Information captured within the framework can also help in ameliorating problems in sectors likely to decline further. The need for further development research is also identified. Specifically at the level of the firm and network, there is a need to generate a more detailed framework of analysis of factors that contribute to successful processes of network management, learning and innovation, from which more detailed policy could be enacted in future.     

Environmental and socio-economic sustainability of chinampas (raised beds) in Xochimilco,Mexico City

The chinampas (raised beds) of Xochimilco, Mexico City, are highly productive, traditional wetland agricultural systems, which were able to feed most of the population in pre-hispanic times. There is a strong trend to substitute chinampas with plastic greenhouses for flower production, which creates negative impacts in the landscape, environment and culture. This study compares the environmental and socio-economic sustainability of chinampas and greenhouses, at both the farm and regional levels, using the MESMIS framework. Even though the results show that greenhouses are more profitable, the contribution of chinampas to ecosystem services cannot be substituted by greenhouses, as tree cover is lost, canals are filled and food is not provided. Greenhouses had a higher diversity, but also a higher agrochemical use and are heavily dependent on external inputs and subsidies. Chinampas have shifted from staple crops to commercial horticulture in order to remain a technically viable and economically feasible option for local farmers. However, compensation mechanisms for the provision of ecosystem services are urgently needed if this ancient system is to be maintained. The framework allowed the integration of indicators at both farm and regional scales, combining on-farm surveys with GIS techniques, which could assist in ecosystem service valuation.     

Comparing factor analytical and circumplex models of brand personality in brand positioning

Competition has never been greater, which means it is more important than ever that organizations assess their brand management strategies, including brand personality management. However, little empirical research addresses the brand personality concept, particularly its role in product evaluation. An exception, which views brand personality as a set of human personality characteristics associated with a brand, has been criticized for its use of a factor analytical approach. An alternative approach posits that the brand represents a relationship partner with which the consumer may choose to engage; it corresponds to the interpersonal circumplex approach to personality modeling. The present study compares these two approaches by developing brand positioning maps and predicting consumer outcomes. The results support the factor approach in a purely quantitative sense, but the circumplex approach offers both a richer qualitative explanation of the findings by encompassing a broad spectrum of traits and a more diagnostic prediction of consumer outcomes. The alternative conceptualization of brand personality contained in these results should be of interest to brand managers. © 2009 Wiley Periodicals, Inc.     

THE ECONOMIC IMPACTS OF VOLUNTARY ENVIRONMENTAL PERFORMANCE OF FIRMS: A CRITICAL REVIEW

Abstract.  New trends in studies on the governance of natural assets include substantial consideration of the role of voluntary initiatives. A traditional economic view states that there is a trade-off between being green and being competitive. According to that view, no voluntary environmental action is expected to occur. To undertake an in-depth analysis of the scope for voluntary action, this paper reviews empirical literature that analyzes the relationship between manufacturing firms' environmental initiatives or performance and economic results. This review moves beyond the general test of the 'pay to be green' hypothesis, preferring instead to systematize empirical results in more specific research questions. Empirical findings of the reviewed literature generally support that there is no penalty for being green. In addition, the typology of firms, the methods utilized for implementing environmental initiatives, the intensity of abatement efforts and stockholders' valuation of green firms have all been shown to have a sizeable influence on the actual economic results of environmental action or management. Consequently, the findings of this paper challenge the traditional strategic theory that predicts widespread free-riding; it holds major implications for environmental policy-making and environmental business decisions.     

Economic integration and corruption

We study the link between corruption and economic integration. Integration is modeled by a common regulation for public procurement. We show that integration resolves a term of trade driven prisoner's dilemma and will always take place in the absence of corruption. Corruption may destroy the incentives for integration. If the propensities to corruption are too different, the more honest country, which benefits less from integration, will not be willing to join the union. This difference in corruption propensities can be offset by a difference in efficiency. We also show that integration has the positive effect of reducing corruption.