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排序方式: 共有1616条查询结果,搜索用时 31 毫秒
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Journal of Industry, Competition and Trade - Although patenting propensity has been an old topic, our understanding of it is still fragmentary due to the complexity in the decision-making and the... 相似文献
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Di Fang Michael R. Thomsen Rodolfo M. Nayga Aaron M. Novotny 《Southern economic journal》2019,86(1):83-105
We examine the effect of the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) on the quality of household food purchases using the National Household Food Acquisition and Purchase Survey (FoodAPS) and propensity score matching. A healthy purchasing index (HPI) is used to measure nutritional quality of household food purchases. WIC foods explain the improvement in quality of food purchases, not self‐selection of more nutrition‐conscious households into the program. The improvement in purchase quality was driven entirely by WIC participating households who redeemed WIC foods during the interview week. There was no significant difference between WIC participants who did not redeem WIC foods and eligible nonparticipants. In this sample, there is no evidence that lack of access to clinics has adverse effects on participation nor is there evidence that HPI depends on supermarket access. A supervised machine learning process supports our main conclusion on the importance of WIC foods. 相似文献
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跨文化交际是指不同文化背景的人们之间的交际.外语教学的根本目的是实现跨文化交际,因此,应重视跨文化交际在口语能力教育上的重要作用,使学生了解语言与文化之间的关系,注重培养跨文化的意识,熟知中外文化异同与语言表达的形式特点,避免交际中出现语法应用正确却产生文化冲突的现象. 相似文献
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作为实现财富增值保值的有效手段,投资组合引起了实务界和学术界的广泛关注。然而,以往研究大多忽略了金融市场的复杂性、外部因素的不确定性和历史数据的缺失性。为更准确刻画金融市场的现实状况、求解最优投资组合,本文引入不确定变量来描述证券收益率,进而构建包含交易成本、整手交易、流动性风险、交易上下限和行业分散化等现实约束的证券不确定投资组合模型;同时采用遗传算法进行计算,并代入模拟交易数据对比有现实约束和无现实约束投资组合模型的最优解。研究结果表明,引入现实约束条件后,最优投资组合发生了变化,期望收益率显著下降。上述研究结论带来的启示:对于证券投资者而言,在进行投资交易时,应充分考虑交易成本和不确定性风险,确保将投资风险限制在可控的范围之内;对于证券监管机构而言,应加强对证券市场的监督与管理,尤其是系统重要性机构,防范和化解流动性风险和不确定性风险。 相似文献
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This study identifies the main shocks that cause fluctuations in French output and their channels of transmission. It uses
a large-dimensional structural approximate dynamic factor model. There are three main findings. First, common shocks, especially
demand shocks, which seem to originate from the U.S., play an important role in explaining French economic activity. While
international trade, relative prices, and foreign direct investment (FDI) flows are the main channels of transmission, the
stock market, consumer confidence, and interest rates also matter. Second, France’s integration with the rest of the world
has increased over time. Third, there is some tentative evidence of regional components in explaining French output fluctuations;
country-specific components also contribute. The predominance of exogenous factors affecting French output, the asymmetry
in the transmission of shocks, and France’s participation in a currency area argue for making French goods, services, and
labor markets as flexible as possible. 相似文献
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Simone Di ZioAuthor Vitae Antonio Pacinelli Author Vitae 《Technological Forecasting and Social Change》2011,78(9):1565-1578
This paper proposes a modified version of the Delphi method, starting from the assumption that in many situations the convergence of opinions can be considered in a spatial context. The Spatial Delphi we suggest is based, like the classical Delphi, on the judgments of experts, and it is useful in the consultations for decision and/or forecast purposes, provided that they concern matters of spatial location. The basis for the questionnaire is a map, on which each expert provides, as answer(s), one or more opinion-points, i.e., locations that, according to their opinion, are best for a specific purpose. We propose a method for narrowing the area of convergence along a multi-step procedure so that the final result of the consultation is a small portion of the initial territory with respect to the initial area considered. Besides a simulation study, we report also a prototype application with a panel of twelve experts. 相似文献