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This paper is concerned with the problem of testing for the presence of allocative inefficiency in firms for models in which the cost function is stochastic, the possibility of technical inefficiency is allowed, and the efficient input cost share equations are stochastic. The test exploits the relationships among the disturbances in the cost and share equations to derive implications of the existence of allocative inefficiency. This leads to the use of a Wald-type statistic to take account of the one-sided nature of the alternative. Some empirical experience is reported. 相似文献
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Trade Marks and Performance in Services and Manufacturing Firms: Evidence of Schumpeterian Competition through Innovation 总被引:1,自引:0,他引:1
We develop Lancaster's model of consumer behaviour under product differentiation to analyse Schumpeterian creative destruction. Launching new products with novel characteristics enables firms to temporarily steal market share from rivals. Product launch is monitored by using trade marks, patents and research and development. The dataset covers a large sample of UK service and manufacturing firms. We find that stock market value is positively associated with own trade mark activity and trade mark‐active firms achieve significantly higher value‐added. Greater trade mark activity by competitors reduces net output of firms, but raises their stock market value. This is consistent with the Schumpeterian process of competition through innovation. 相似文献
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Leon Roets Annali Botha Sarie P. Human Herman Strydom Martha J. Watson 《Development Southern Africa》2016,33(5):613-627
Homelessness in South Africa requires collaborative research. Social, political, cultural and economic factors that cause homelessness must be considered to develop a common definition and understanding of homelessness. South Africa’s social complexity and diversity make it challenging to construct available results into one conceptual framework, and this in turn complicates national policy implementation and role allocation. By means of a rapid critical appraisal of literature on homelessness in South Africa, researchers provide evidence to direct and structure contextual research pertaining to homelessness. Four themes transpire: conceptualisation; demography; roles and responsibilities of key stakeholders; and strategic policy and research issues. Researchers caution that the findings are not generalisable, because of the rapid nature of the appraisal and possible selection bias of the literature. Measures of validity were used to ensure that the study accomplished its purpose through the key results and to ensure that the results are a true reflection of available evidence. 相似文献