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Explaining the survival and failure of firms is an important issue for researchers and managers of firms in society. Ecological approaches to the study of firms have existed for over 100 years, and have been increasingly popular during the past 40 years, especially since the pioneering works of Hannan and Freeman on one hand, and Aldrich on the other. This paper, in keeping with recent developments elsewhere in mainstream ecology outlines and positions the theoretical and philosophical foundations of an alternative ecological approach, autecology, that has not yet been formulated for the study of firms. The autecological approach affords the individual firm more autonomy in creating its own future evolutionary trajectory. The idea of an ecological complex is developed to provide clear focus on what is central to the application of autecology to the study of firms. The paper also considers several emergent research opportunities that highlight the potential value of employing an autecological approach to the study of firms.  相似文献   
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In sub‐Saharan Africa, there is fairly broad agreement that increased investment in key public goods such as roads and communications infrastructure, agricultural research and water control will be required if revitalised agricultural development is to take place. However, it has proved more difficult to reach agreement on what needs to be done to improve the performance of agricultural markets. In this article we set out an agenda for investment and policy reform in this area, providing a brief theoretical examination of the co‐ordination problems involved before examining in turn demand and supply constraints affecting smallholder farmers, and policies for price stabilisation and the co‐ordination of support services. We also argue that increased attention needs to be paid to governance issues.  相似文献   
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Although UK legislation against age discrimination is required by December 2006, little is yet known about how ageism affects different age categories of employees, and the gender dimensions of ageism have also been neglected. Both issues were investigated by questionnaire survey, producing responses from over 1000 employees of a major UK financial services enterprise. The extent and manifestations of ageism were found to vary across age categories and by sex, and evidence of gendered ageism emerged. Reported examples of ageism were highest among younger and older age categories, but all age groups were affected to some degree. Across all ages, women were more likely than men to experience ageist attitudes concerning appearance or sexuality. To be effective, legislation will need to cater for the complex nature and patterns of age discrimination revealed, though the comparator problem and other complexities are such that important aspects of age prejudice, including gender dimensions, risk being overlooked.  相似文献   
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The interaction of geography and world-systems theory has created two groups of work. The first body of work uses world-systems theory as its theoretical framework with minor levels of critique or change. The second body of work attempts to inform world- systems theory by explicitly including a geographical perspective. Human geographers attracted to world-systems theory provide a perspective that highlights the role of agency in what is widely perceived to be a rigid structuralist approach. Key geographical concepts of region and place are viewed as social constructs created within an overarching context of structural imperatives. By conceptualizing places, states, and the macroregions of core, semiperiphery, and periphery as geographical scales, the role of agency in creating and maintaining the important structures and institutions of the capitalist world-economy, such as hegemony, is illustrated. The geographer's interest in the creation of geographical scales results in analysis of the dynamism of the contemporary world-system.  相似文献   
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