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This study estimates the technical efficiency measures of maize producing farm households in Ethiopia using stochastic frontier (SF) panel models that take different approaches to model firm heterogeneity. The efficiency measures are found to vary depending on how the estimation model treats both unobserved and observed firm heterogeneity. Estimates from the ‘true’ random effects (TRE) models that treat firm effects as heterogeneity are found to be identical to those from pooled SF models. Those results differ from the ones generated from the basic random effects (RE) models that treat firm effects as part of overall technical inefficiency. The more flexible generalised ‘true’ random effects (GTRE) model that splits the error term into firm effects, persistent inefficiency, transient inefficiency, and a random noise component indicates the presence of higher levels of persistent inefficiency than transient inefficiency. The basic truncated-normal RE model and heteroscedastic RE model yields similar efficiency estimates. The GTRE model predict persistent efficiency measures similar to those from the basic RE and flexible RE model with environmental variables incorporated in the variance function as well as in the deterministic production frontier. These results imply that the RE and GTRE panel models provide reliable efficiency estimates for our data compared to the TRE models. All the estimated SF models generate comparable production function parameters in terms of magnitude and sign. Overall, the results underscore the importance of scrutinising stochastic frontier models for their reliability of analytical results before drawing policy inferences.
相似文献Entrepreneurship research has matured and now spans multiple entrepreneurial contexts, including developing countries, emerging and transitional economies. However, collectivist economies have largely been ignored, partly due to difficulties in conducting research and partly due to the widespread assumption that they remain on the outskirts of entrepreneurial activity. In this paper, from the entrepreneurial event model perspective, we analyse entrepreneurial intention and its antecedents in Cuba, probably the best example of a collectivist economy that exists nowadays. Cuba is compared to Spain, a country that shares historical and cultural features but one which has a developed market economy. Findings indicate that desirability and feasibility constitute the main antecedents of entrepreneurial intention in Cuba, as other studies in market economy countries reflect. However, the influence of desirability on entrepreneurial intention is lower in Cuba compared to Spain, where the values of desirability and feasibility are significantly greater. These results seem to indicate that due to Cuba’s level of development, political regime and collectivist culture, entrepreneurship arises mainly out of necessity and the emergence of a strong entrepreneurial culture is stifled. This reflects a similar situation to the result obtained in previous studies in developing countries.
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