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We measure the extent to which curbside access affects quantity recycled. We use novel data to distinguish between new recycling and material diverted from other recycling modes. We find that the marginal impact of expanding curbside programs on total recycled quantities is small, in part because curbside programs significantly cannibalize returns from drop-off recycling centers. Failure to account for cannibalization from other modes may substantially overestimate the benefits of curbside programs. We conclude with simple cost-effectiveness comparisons. Results suggest that incremental expansion of curbside access may not be cost-effective. ( JEL Q53, Q58, H72)  相似文献   
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The purpose of this article will be to outline a symbolic interactionist approach to the study of politics in the United States. In the course of this presentation, the basic assumptions and concepts of the interactionist perspective will be presented, culminating in a model of society as a negotiated order. This model in conjunction with definitions of power and politics will provide the basis for analyzing the processes of power. The article will focus on and emphasize two mechanisms of power, information flow control and symbolic mobilization of support, which have previously been unrecognized and unan-alyzed. In the conclusion, the strengths and weaknesses of the approach will be discussed.  相似文献   
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Summary This paper examines the statistical error rate in the BritishJournal of Social Work (BJSW), volumes 1–14. Half of thepapers (n=175) contain empirical data and half do not. Fifty-nineof the empirical articles are quantitative with statisticalanalysis; they account for 17% of the papers in the first 14volumes. Thirty-nine of these papers (66%) make 57 errors, arate which is comparable to that reported in the British Journalof Psychiatry. Nineteen papers (32%) make serious errors. Examplesof the type of errors are described. The wider use of reliablestatistical advice, prior to undertaking data collection, isrecommended.  相似文献   
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SUMMARY. Lack of multi-disciplinary cooperation was seen by the Cleveland Inquiry as one of the major causes of what went wrong. The need for the many different professionals to work together in child abuse has been stressed many times before, but in sexual abuse matters the task, seems particularly daunting. This article reviews the traditional barriers to cooperation, applies them to sex abuse and suggesfs ways of beginning to overcome them  相似文献   
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Please address requests for reprints to Peter Raynor, Centre for Applied Social Studies, University College of Swansea, Singleton Park, Swansea SA2 8PP. Summary This paper was originally presented at a conference on ’theeffectiveness of social work‘ at Swansea in 1981. It arguesagainst a narrowly empiricist model of evaluation in socialwork, suggesting that while such a model may help to improvethe technical efficacy of methods, it can tell us little aboutthe desirability of the goals towards which our methods aredirected, or the social functions which they serve. The finalsection points to some possible resources for rational discussionof areas which ’scientific‘ models of evaluationtend to neglect.  相似文献   
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UNCERTAINTY, EXCHANGE RISK, AND THE LEVEL OF INTERNATIONAL TRADE   总被引:6,自引:0,他引:6  
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