郑州航空港经济综合实验区政策效用评估

航空港经济综合实验区作为经济技术开发区的一种重要形式,对内陆地区而言,是抢占现代产业体系制高点、突破地理条件约束、挖掘自身区位优势的全新探索。应用双重差分法评估郑州航空港试验区对区域经济的作用,结果表明：航空港对区域经济增长具有积极贡献。同时结果显示区域经济增长的重要推动力是通过航空港自身大量基础设施等投资实现的,但在短期内整合、带动区域其它资源禀赋方面尚未达到预期效果。在此基础上,从长期着眼,对航空港本身在整合区域资源、改善区内资源禀赋方面提出建议,为其它省份通过航空港建设推动区域经济增长提供借鉴。     

基于有效波动率的市场一般性风险测度研究

鲁棒跳跃的波动率估计是波动率研究的新方向。本文首先采用蒙特卡洛模拟技术检验鲁棒跳跃波动率估计量MedRV的有效性以及预测的准确性,结果表明:MedRV能够有效鲁棒跳跃行为,得到有效波动率(EV)的估计量,同时相对于双幂次变差(BV)有更好的预测准确性。然后基于MedRV估计量构造了市场一般性风险测度,并对中国证券市场一般性风险分布特征进行了研究,结果表明:基于MedRV估计量所得到的MedRV-VaR指标可以有效摒除极端市场风险因子,得到市场一般性风险测度。     

我国房地产业健康和谐发展的政策环境与对策

当前,为维护房地产市场的稳定,政府出台了一系列的政策措施.一方面解决中低收入居民的住房需求,加大保障性住房的建设力度,另一方面鼓励普通商品房消费,防止房价大起大落.要使我国房地产业和谐发展,需探索房价与地价剥离的定价方式,强化房地产企业的自身建设,加强与房地产相关的金融产品创新,继续加大保障性住房的建设力度.     

Unemployment insurance benefits and income smoothing

Labor unemployment insurance reduces unemployment concerns. We argue that these benefits moderate incentives to smooth earnings to reduce employees’ concerns about unemployment risk. Using exogenous variations in unemployment insurance benefits, we find evidence consistent with this argument. We also find that the link between unemployment insurance benefits and income smoothing is stronger when there is higher unemployment risk and when the firm is likely to employ more low-wage workers, who find unemployment insurance benefits especially useful. Our paper contributes to the literature by showing that public policy decisions such as unemployment insurance have significant, albeit probably unintended, externalities on corporate financial reporting.     

美、日两国动漫旅游开发对上海动漫业的影响

国外动漫旅游开发已经积累了许多宝贵经验,在通过对国外动漫旅游开发经验的学习、借鉴基础上,做大做强上海动漫产业成为可能。研究表明：营造特色动漫景点,完善动漫观光设施,打造特色动漫会展品牌,能有效促进上海市动漫旅游的开发。     

Economic policy uncertainty and stock price crash risk

This paper studies the impact of economic policy uncertainty on stock price crash risk using data from China. We develop a new index to measure Chinese economic policy uncertainty and find that economic policy uncertainty has a remarkable positive effect on stock price crash risk. However, the effect reverses later. The results also indicate that the positive effect of economic policy uncertainty on stock price crash risk is more prominent for state‐owned enterprises. Moreover, this effect is more prominent for firms with higher information asymmetry and firms with greater disagreement among investors, indicating that economic policy uncertainty affects crash risk through two mechanisms: managers’ concealment of bad news and investors’ heterogeneous beliefs.     

浅谈技术创新对我国国际贸易的影响

随着国际贸易和科技的相互促进与发展,在当今的时代,技术创新对国际贸易的影响越来越明显。其主要表现在技术创新可以诱发产业结构升级,促进国际分工深化,提高国际贸易产品的竞争优势,改进我国国际贸易产品结构,提高国际贸易的效率和效益等方面。     

我国生猪养殖户饲料需求行为分析——基于对辽宁、河北生猪养殖户的问卷调查

本文以对辽宁、河北两省生猪养殖户饲料使用情况的调研数据为基础,从养殖户饲料需求的总体情况、养殖户的不同养殖规模、养殖户的不同兼业程度3个角度分别对我国生猪养殖户的饲料需求行为进行分析。结果表明:调研两省生猪养殖户的工业饲料使用比重不高、饲料粮使用比重较高、农副产品使用比重差异较大,这主要是受生猪养殖的规模化水平、饲料价格以及当地资源条件等因素的限制。     

A NEW THEORY OF DEMAND AND SUPPLY AND EMERGENCE OF INTERNATIONAL TRADE FROM DOMESTIC TRADE

Abstract. In the paper a fixed learning cost is introduced into a framework with consumer-producers and transaction costs. The fixed learning cost yields a rate of return on the investment in individual specific learning and training which is increasing in its rate of utilization. Division of labor can avoid duplicated learning costs and generate economies of specialized learning. The tradeoff between economies of specialization and transaction costs can be used to explain concurrent increases in the extent of the market, aggregate demand, productivity, trade dependence, the degree of market integration, the degree of production concentration, diversity of economic structure, variety of different professions, each person's level of specialization, and the extent of endogenous comparative advantage and the emergence of international trade from domestic trade. This model explains demand and supply as two sides of the level of division of labor which is determined by a transaction cost coefficient. Hence, the demand law may not hold even for normal goods owing to complicated interdependencies between the level of specialization and demand and between the level of specialization and prices of traded goods. The extended version of this model with the CES function is used to endogenize variety of consumption in addition to the endogenization of individuals'level of specialization.     

50D/144F涤纶POY扁平丝生产工艺

在熔体直纺环吹风冷却工艺路线上,使用“—”型喷丝板,设置缓和的冷却条件,适当的无风区高度,纺丝温度及纺丝速度,开发生产50D/144F扁平丝。