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1.
Programs to improve water quality do not improve all water bodies equally. Evaluation of the benefits of such programs must account for where improvements occur and the relative magnitude of improvements that occur in different places. This study uses a choice experiment survey to explore how the value to a household of a surface water quality improvement varies as a function of (i) the distance between the household and the affected streams and rivers, (ii) the degree to which the quality of the water has been improved, (iii) how many stream and river miles have been improved, and (iv) the sizes of the affected streams and rivers. Results show evidence that value declines with distance in an approximately linear way, weak evidence that large rivers are worth more than small rivers, and no evidence that willingness-to-pay is nonlinear in either the degree of water quality improvement or the number of stream miles improved. These results indicate that it may be defensible in applied work to value small, spatially-explicit water quality improvement projects independently and then sum over projects. 相似文献
2.
人工收集和整理2012—2018年在中国市场上映的首轮院线电影信息数据,构建电影需求的嵌套logit回归模型,以新冠肺炎疫情为准自然实验,来量化突发公共事件对电影行业复产复工的影响。结果显示:第一,关于上映时间选择,在恢复营业后,如果所有因为疫情尚未上映的电影选择顺延上映能有效避免过度竞争的局面。第二,关于上映节奏控制,控制好未定档电影的上映节奏,保持适当的竞争能促进经济效益提升。其中,从11月份开始以每周两部的频率上映未定档电影的经济效益最佳。第三,关于上映方式选择,与线下播放相比,疫情期间选择线上播放能及时收回成本并有利于经济收益最大化的实现。研究结论为电影行业制定复产复工策略提供依据,为未来应对突发公共卫生事件提供参考。 相似文献
3.
The Prebisch–Singer hypothesis in economics asserts that over time the relative price of primary goods relative to manufactured goods should experience a downward trend. To test the hypothesis, we must first establish the unit root properties of the relative price term and then regress the stationary series on a trend term. We use the quantile unit root test which allows for both smooth unknown numbers and the form of breaks in the trend function through a Fourier function to show that the relative price of 23 out of 24 primary goods is stationary. However, the Prebisch–Singer hypothesis is supported only in half of the primary commodities. 相似文献
4.
We revisit hysteresis effect in the unemployment rate of each of the 52 states of the United States using nonlinear quantile unit root test over the period 1976M1–2016M7. Our results indicate that unemployment rate of the U.S. economy as a whole displays hysteresis effect over recessionary periods. Nineteen out of 52 states display hysteresis behaviour over the period 1976–2016. For the remaining 33 states, we find four types of behaviours. Some states display stationarity behaviour almost in all quantiles. Some display hysteresis over recessionary periods and in contrast some display hysteresis over expansion period. 相似文献
5.
This paper considers a Lagrange multiplier (LM) based panel unit root test that allows for heterogeneous structural breaks in both the intercepts and slopes of a series. We note that many popular time series variables are likely to exhibit changing means and/or trends over time. Given that the usual tests will depend on the nuisance parameters indicating the locations of the trend breaks, we adopt a transformation procedure that makes our new panel unit root tests invariant to the nuisance parameters. To illustrate the importance of the power gain provided by our test, we examine the convergence hypothesis using relative ratios of per capita health care expenditures in 20 OECD countries. Our results provide evidence that the convergence hypothesis is supported. 相似文献
6.
Yu-cheng Lai 《Global Economic Review》2019,48(1):88-110
Using Manpower Utilization Survey data for 14 years from 1999 to 2012, we applied the DDDD (Differences–in–differences–in–differences–in–differences) estimation method to check if rising presence of foreign migrant workers in Taiwan’s domestic labour market had any impact on employment opportunities and wages earned by native Taiwanese workers over time. We used the data capturing the effect of college premium (viz., the additional cost to be borne for getting admission into college) paid by the natives on domestic wage rate during this period. College premium is an indicator of demand and supply for educated labour and we intend to see if the premium has grown with time when influx of foreign migrant workers has grown too. From the results, two interesting phenomena caught our attention. First, labour policy adopted by the Government in Taiwan has played an important role in increasing the influx of foreign workers into domestic labour market, which resulted in significant change in college premium paid by the natives. And, this effect lasted even when instances of strikes and reported cases of labour disputes were relatively higher. Second, the effect of the policy has been varying across genders as our data shows that policy on employment of foreign workers has affected job opportunities of native men workers more than it affected job opportunities of their female counterpart. 相似文献
7.
陈洪武 《广东农工商职业技术学院学报》2021,(1)
如何使高职院校体育课程教学既顺应时代发展要求,形成办学特色,又能具有更好的教学质量和教学效果,是高职院校体育工作者非常关注的问题。在对体育俱乐部教学模式的概念和特点阐述的基础上,对高职院校传统体育教学模式存在的问题进行了分析,总结了高职院校体育俱乐部模式教学的重要性,指出俱乐部模式教学的体育课学生氛围较好,学生的认可度高,最后分析与阐述了高职院校体育俱乐部模式教学改革的实践措施。 相似文献
8.
Dinh Tuyen Hoang Ngoc Thanh Nguyen Van Cuong Tran 《Enterprise Information Systems》2019,13(7-8):1023-1045
ABSTRACTThis paper proposes a hybrid collaboration recommendation method that accounts for research similarities and the previous research cooperation network. Research cooperation is measured by combining the collaboration time and the number of co-authors who already collaborated with at least one scientist. Research similarity is based on authors’ previous publications and academic events they attended. A weighted directed graph is built to discover new collaborators by using direct and indirect connections between scientists. Moreover, a consensus-based system is built to integrate bibliography data from different sources. The experimental results show that our method improves the recommendation performances over other methods. 相似文献
9.
本文利用中国A股上市公司2006-2015年的数据,研究社保基金持股对上市公司盈余质量的影响。我们用上市公司财务重述作为测度盈余质量的指标,发现社保基金持股能够显著降低企业发布财务重述的概率,这表明社保基金对上市公司盈余质量的提高具有促进作用。并且,社保基金的这一治理作用在国有企业、内部治理水平较差以及市场化程度较低地区的上市公司中更加显著。通过双重差分模型和安慰剂检验等方法弱化了内生性问题之后,以上结论依然成立,说明社保基金持股和盈余质量提升之间存在因果关系,我们称之为社保基金的公司治理作用。进一步研究发现,社保基金可以通过抑制控股股东资金占用、增加机构调研次数等途径提升被持股公司的盈余质量。本文有助于认识和评估社保基金持股对于上市公司的监督与治理作用。 相似文献
10.
This article compares the salary structure of tenured and tenure-track faculty across schools within the university systems of North Carolina and New York. Specifically, we establish a positive relationship between school prestige and salary inequality, both overall and within specific academic ranks. This result suggests that the value to teaching is less discipline-specific than the value to research output. Marked differences in the aforementioned statistical linkage across academic ranks also confirm prior speculation that junior faculty salaries are more closely tied to academic value than senior faculty salaries. 相似文献