我国原油、煤炭和天然气的价格波动关系的研究——基于DCC-MVGARCH模型的实证分析

本文以原油、煤、天然气的价格收益率作为研究对象,运用DCC-MVGARCH模型,得出能源价格波动的动态相关系数,通过实证分析发现能源价格波动性的关系。结果表明,原油市场和煤炭市场波动性的动态相关系数随时间发展不断增长,原油市场和天然气市场波动性的相关系数比较稳定,煤炭市场和天然气市场波动性也比较稳定。     

浅析合理低价法投标报价策略和方法

随着市场经济体制的不断完善,恶性竞争逐渐减少。本文通过阐述合理低价法的含义及与投标报价之间的关系,以及报价策略,分析投标报价决策和清单单价报价的技巧,同时提出相应的政策建议,进而为招投标管理提供参考依据。     

浅谈工程施工投标技巧

面对日益激烈的市场竞争,企业如何提高中标率以及如何在投标中获取最大的利润等都已经成为人们较为关注的重点,其中投标的编制技巧与报价策略都成为投标单位较为关注的热门话题,而投标策略和技巧在中标率较高的施工企业中有着不可忽视的作用。投标技巧主要就是以投标人在投标过程中需要关注的问题为重点。     

Second price auctions on general preference domains: two characterizations

Auction theory usually assumes the quasi-linearity of individual preferences. We drop this assumption and define an extension of second price mechanisms that applies to general preferences. It turns out that the extended second price mechanisms are the only rules satisfying efficiency, strategy-proofness, and a mild non-imposition property. Their definition is simple just as much as the definition of usual second price mechanisms: everyone reports his maximum willingness to pay and the bidder whose reported value is highest buys the auctioned object for the price equal to the second highest reported value. The characterization is valid if efficiency is replaced by envy-freeness. I gratefully acknowledge an associate editor and two anonymous referees for their very helpful comments. Hiroki Saitoh and Shigehiro Serizawa independently obtain a result that is closely related to my main result (see, Remark in Sect. 1). I thank them for sending me the paper and communication, and Yuji Fujinaka for informing me about their work. I also thank the financial support by KAKENHI (19310031).     

中国商业银行信贷业务经营中的贷款定价问题研究

近年来中国商业银行信贷业务快速扩张势头尤为强劲,但与其相适应的信贷业务经营收益水平却未随之同步提高,由此凸现出信贷业务快速扩张背后贷款定价问题的困扰。提高中国商业银行的贷款定价能力,从而在信贷业务经营过程中,卡准信贷资金成本与收益的啮合点,做到信贷业务经营成本的可控性,提高信贷业务经营收益水平是解决困扰之选择。     

网络商品价格搜寻与实证分析

本文以实证的方式研究了网络商品的价格离散程度,证明了由于互联网使信息在市场中呈现均衡分布,成本与价格的透明度被提高,从而网上商品价格也趋于收敛。在完全信息市场上,当信息获取成本极低或为零时,交易者反而减少了从事信息收集的积极性,信息搜寻者的搜寻周期和次数都将减少,决策的速度从而可以加快。网上信息搜寻沿着特定的路径进行,搜寻成本已不再是信息搜寻中最主要的影响因素,市场的成熟情况、网络的传输率等将成为搜寻原则中新的内容。     

国际热钱进入与国家粮食安全

2006年末以来,世界农产品价格大幅上涨,围绕粮食、食品的国内外投资和交易成为新的经济热点。作为世界粮食大国和人口大国,为控制通货膨胀,实施低粮价政策,这为国际热钱进入粮食领域提供了条件。本文分析了我国现有粮食管理体制下热钱进入的可能性、规模、方式和途径,在此基础上提出了打击热钱进入粮食领域的长效措施。     

Noisy chaotic dynamics in commodity markets

The nonlinear testing and modeling of economic and financial time series has increased substantially in recent years, enabling us to better understand market and price behavior, risk and the formation of expectations. Such tests have also been applied to commodity market behavior, providing evidence of heteroskedasticity, chaos, long memory, cyclicity, etc. The present evaluation of futures price behavior confirms that the resulting price movements can be random, suggesting noisy chaotic behavior. Prices could thus follow a mean process that is dynamic chaotic, coupled with a variance that follows a GARCH process. Our conclusion is that models of this type could be constructed to assist in forecasting prices in the short run but not over long run time periods.First version received: June 2001/Final version received: March 2003     

When was the U.S. housing downturn predictable? A comparison of univariate forecasting methods

This paper uses three classes of univariate time series techniques (ARIMA type models, switching regression models, and state-space/structural time series models) to forecast, on an ex post basis, the downturn in U.S. housing prices starting around 2006. The performance of the techniques is compared within each class and across classes by out-of-sample forecasts for a number of different forecast points prior to and during the downturn. Most forecasting models are able to predict a downturn in future home prices by mid 2006. Some state-space models can predict an impending downturn as early as June 2005. State-space/structural time series models tend to produce the most accurate forecasts, although they are not necessarily the models with the best in-sample fit.     

中国生猪价格波动特征分析

使用2000—2009年中国生猪批发价格月度数据,分析了我国生猪批发价格运动的轨迹。研究结果表明:近年来我国生猪批发价格年度内震荡加剧且具有明显的季节性波动特征。并利用ARCH模型对生猪批发价格波动的动态过程进行了分析,发现滞后1期及滞后5期的生猪批发价格变动与当期价格变动的方向相同,而滞后2期的批发价格对当期价格有回调作用。