禽流感危机下肉鸡产业市场状态分析*——基于互联网大数据和MS-VAR模型

[目的]为了有效应对禽流感冲击、维持肉鸡产业稳定健康发展。[方法]基于互联网大数据构建了禽流感舆情指数,选取2012年1月至2017年3月周度数据,通过MS-VAR模型分析了禽流感危机下肉鸡市场状态的转换特征以及不同市场状态下产业链价格传导关系。[结果]2012年以来可将肉鸡产业市场状态划分为危机状态和正常状态,肉鸡产业市场在两个市场状态下转换频繁;肉鸡产业危机市场状态和正常市场状态平均持续期分别为4.65周和9.05周;肉鸡市场在区制转移概率上存在明显的非对称特征;肉雏鸡、活鸡和白条鸡价格之间在危机状态下相关性小于正常市场状态下相关性;不同市场状态下肉鸡产业链价格传导存在差异;肉鸡产业市场在危机状态下不稳定程度明显增加。[结论]提出了加大对禽流感疫情的监测以及疫情处理能力,密切关注公众禽流感舆情动态变动情况,做好舆情引导,加强禽流感疫情科学知识的宣传,增强公众对禽流感的认知等对策建议。     

技术创新对安徽区域经济增长的影响分析

地区经济增长的主要动力是建立在技术创新基础上的产业结构调整.文章首先分析技术创新与经济增长的关系,接着通过三次产业劳动生产率的转变以及重点企业和企业集团研发费用的投入分析安徽技术创新的基本现状.为了进一步了解安徽技术创新对经济增长的影响,运用实证研究的方法,将中部六省的技术创新情况加以对比,具体说明技术创新与经济增长的关系.最后结合实际,提出了利用区域创新促进经济增长的一些建议.     

确权、交易、资产化：对大数据转为生产要素基础理论问题的再思考

大数据是数字经济的基础性、战略性资源,是后疫情时代经济发展的重要生产要素,但社会各界对大数据的理论认知仍落后于其应用实践,而且大数据确权、交易定价、资产化问题也存在诸多争议,这对大数据产业和数字经济的持续健康发展形成潜在隐患,也成为制约大数据向生产要素正常转化并参与社会大生产的关键。文章在对大数据概念、属性重新认识的基础上,综合财经、法律等理论观点和实操技巧,阐述了大数据如何从商品流通要素演变为社会生产要素的市场逻辑以及使用价值如何注入大数据的资产化过程,并从实践视角提出大数据确权的法理基础和大数据交易所生态下交易定价模型。同时提出以数据税来弥补大数据采集环节个人和企业放弃的小微权利,将私权转化为社会公共产品,为大数据产业和要素市场发展提供新的借鉴。     

G20《消除数据差异提案》及对我国的启示

2008年国际金融危机的爆发,揭示出全球系统重要性金融机构之间存在着巨大的信息差异,欧美等国充分意识到一套全面及时的数据统计标准对于经济金融市场稳定的重要性。有鉴于此,G20于2009年发布了《消除数据差异提案》（Data Gaps Initiative）,在提案中提出了统一整合全球经济金融数据统计方式的20条建议。2013年G20峰会上,各国财长和央行行长一致表示要继续推动《消除数据差异提案》的实施,该提案预计将在2015年底被完全实现。本文对该提案出台的背景、主要内容和最新进展进行了梳理和分析,总结出对我国的影响与借鉴意义：有助于更好地实现我国宏观审慎政策目标;有助于促进我国数据统计标准化的发展;有助于提升我国宏观经济和金融稳定分析的水平。     

Are USDA reports still news to changing crop markets?

This study investigates whether major USDA reports still provide important news to changing crop markets. The news component of each report, or market “surprise,” is measured as a difference between the USDA estimate and its private expectation in corn, soybeans, and wheat markets. Changes in the relevance of USDA information are assessed by examining changes in the magnitude of market surprises and shifts in the futures price reaction to these surprises, which isolates the impact of each report. The stable size of market surprises over time suggests that competition from alternative data sources has not reduced the news component of USDA crop reports. Increasing price reaction to most reports, including those facing competition from alternative information sources, suggests that value of public information may be enhanced in uncertain markets affected by structural changes.     

The impact of maize price shocks on household food security: Panel evidence from Tanzania

Using three waves (2008/09, 2010/11, 2012/13) of the Tanzanian National Panel Survey, this study investigates the impact of maize price shocks on household food security. Between 2008/09 and 2012/13, calorie intake stagnated for urban households, yet sharply deteriorated for rural households. The latter was driven by a significant decline in the consumption of the major staple maize which showed strongest price hikes among all major food items. Fixed-effects regressions indicate a clear negative relationship between maize prices and average household energy intake. Almost all population groups were found to be negatively affected by maize price shocks, with rural landless households being the most vulnerable group. In particular, a 50 percent rise in maize prices decreases caloric intake for rural (urban) households on average by 4.4 (5.4) percent, and for rural landless households by 12.6 percent. Results further indicate that subsistence agriculture can act as an effective strategy to insure against food price volatility.     

Inconvenience cost of mobile communication failure: The case of South Korea

Mobile communication failure can occur when mobile traffic exceeds the manageable level. This depends on frequency bandwidth. Mobile communication failure causes inconveniences in a user's daily life that lead to social and economic damage. To address this issue, mobile telecommunications companies deploy additional bandwidths and develop new technologies, but these are costly strategies. This study applies a spike model based on a contingent valuation method (CVM) to measure the inconvenience cost resulting from mobile communication failure. The mean monthly willingness-to-pay (WTP) to avoid communication failure per user is estimated to be KRW 898.14 (USD 0.80) over a period of five years in our study. The inconvenience cost borne by the population is estimated to be KRW 2.97 trillion (USD 2.61 billion). Users experiencing greater frequency of communication failure are found to be willing to pay more to avoid the inconvenience. When excluding respondents citing zero-WTP, the mean WTP per user was calculated to be KRW 3426.41 (USD 3.01). Data traffic usage and frequency at which communication failure is experienced are variables that exhibit statistically significant effects on WTP to avoid mobile communication failure. Overall, estimation results show that a price discrimination based on data traffic usage or quality can be considered by mobile telecommunications companies and regulators to address the issue of data traffic inducing mobile communication failure.     

经济全球化对我国环境污染影响的实证研究——基于行业面板数据

我国经济的高速发展和伴生的环境污染问题,是在我国经济加速融入全球经济的背景下发生的。本文在阐述经济全球化的含义和构建经济全球化指数的基础上,基于我国33个工业行业1997-2005年的面板数据,采用PCSE稳健估计,发现经济全球化显著降低了我国的环境污染水平,同时得出了我国规模效应、技术效应、结构效应以及要素禀赋等的结果。     

Do R&D and ICT affect total factor productivity growth differently?

We analyze the effect of ICT and R&D on total factor productivity (TFP) growth across different industries in Sweden. R&D alone is significantly associated with contemporaneous TFP growth, thus exhibiting indirect effects. Although there is no significant short-run association between ICT and TFP, we find a positive association with a lag of seven to eight years. Thus, R&D affect TFP much faster than ICT-investments. We also divide ICT capital into hardware and software capital. To our knowledge, this distinction has not been made in any previous study analyzing TFP at the industry level. The results show that lagged hardware capital services growth is significantly associated with TFP growth. Hence, investments complementary to hardware are needed to reap the long-run TFP effects from reorganizing production.