国内外农产品价格波动研究及最新进展

农产品价格稳定一直是世界各国农业宏观管理的核心问题。国外对农产品价格波动研究的成果非常丰富．近年来的研究侧重对汇率波动、能源危机、金融资本等外部冲击因素对农产品价格影响的考察。国内对农产品价格波动的研究理论较为薄弱,侧重对粮食、生猪等大宗农产品价格波动的实证分析,近年来也开始关注国际农产品价格波动等外部冲击因素对国内价格的影响。现有文献存在对生鲜农产品波动研究较少、对各种外部冲击的传导机制厘清不够、对各种外部冲击因素的贡献度缺乏比较以及对价格波动中的非对称性效应分析不够等不足。     

国际原油价格与农产品价格的波动效应研究——基于VAR-DVEC模型

利用1997年3月—2012年12月数据,建立VAR模型研究国际原油价格对国内大豆价格、玉米价格和小麦价格的动态冲击;同时运用DVEC和DVEC-TARCH模型分析国际原油价格波动和国内主要农产品价格波动的关联性和非对称性。结果发现:国际原油价格和国内大豆价格互为Granger原因,国际原油价格对大豆价格影响程度最大,对玉米价格的影响次之,对小麦价格影响不明显;国际原油价格波动主要来自自身前期波动,而大豆价格波动同时受到自身和外部冲击的影响。大豆价格波动呈发散趋势,玉米和小麦价格波动趋于收敛;国际原油价格和大豆价格波动具有非对称性,玉米和小麦价格的非对称性则不显著。     

我国货币长期中性的实证研究

通过运用动态相关系数和格兰杰因果检验的计量经济学方法，对我国的货币供应量与经济增长、物价变动的相互关系进行研究。通过实证检验发现，我国货币长期内呈现中性，货币供应量的长期变动最终导致物价的同幅度增长，并且根据检验结果提出了相应的政策建议。     

我国上市银行非利息收入与净利息收入波动性与相关性分析

近年来,由于受到＂利率市场化＂和＂金融脱媒＂趋势的影响,我国商业银行传统的资产负债业务受到现实的制约,非利息业务不断上升,对商业银行的经营收入结构产生了重大影响。通过采用国内11家上市银行1997年至2008年之间的混合数据,实证分析非利息收入与净利息收入之间的波动性与相关性关系,结果显示：现阶段我国上市银行非利息收入波动性明显高于净利息收入,而且非利息收入与净利息收入间具有顺周期性和轻微的滞后性。     

城市地铁项目建设对沿线住宅价格的影响研究——以西安市地铁2号线为例

随着我国城市化进程的不断加快,大、中型城市的交通拥堵问题越来越严重,而传统的公共交通方式已经不能满足居民日益增长的出行需求。目前,发展以常规公交和地铁交通为主体的公共交通体系是解决交通拥堵问题的有效途径。同时,地铁交通方式的出现又是沿线住宅价格的助推器。文章以正在建设中的西安地铁2号线为实证研究对象,对沿线住宅价格的变化进行定性和定量分析。     

Inequality and demographic response to short-term economic stress in North Orkney,Scotland, 1855–1910: Sector differences

We examine economic inequality and social differences in infant and child mortality, and fertility responses to food price changes in North Orkney, 1855–1910, using linked vital records. This small population featured a diverse occupational structure, limited land resources, and geographic isolation from mainland Scotland. Segments of Orkney’s non-agricultural working population were living so close to the margin of subsistence in normal years that an increase in food prices in bad years cost the lives of their children. Delayed childbearing, in addition to increased labour intensity, occupational diversification, and poor relief, failed to mitigate the negative effects of unfavourable prices in this group. While previous studies for Western Europe show a strong social gradient in mortality responses to food prices, and for Eastern Asia a strong household gradient, this study shows a strong sectoral gradient, indicating low standards of living for the non-agricultural working population well into the twentieth century.     

国家能力、出口复杂度与经济增长波动 ——来自178个国家面板数据的经验证据

作为生产产品所需要的不可交易的投入品集合,国家能力的增加不但有利于经济产出的增长,而且能够增强经济体系中供给和需求的稳定性,进而有利于降低经济产出的波动性;出口复杂度的高低可以反映一国能力的多少,因而出口复杂度的提高可以降低供给波动、需求波动和产出波动.对1998—2017年178个样本国家的分析发现:出口复杂度的提高...     

现行成品油定价机制背后的税利博弈简

自成品油定价机制改革以来,成品油定价机制饱受争议,油价一直是人们关注的焦点。分析了国内需求拉动和国际输入型价格变动是引起油价上涨的主要原因;油价变动对用油企业、个人及产油企业的影响。随着我国国内成品油需求量日益增加,引发用油企业、个人及产油的上游企业与下游企业以及国家各方不断进行利益博弈,提出只有通过国家税收政策经济杠杆的调节作用,才能逐步调整各方利益及分配关系。     

Statistical properties of detrended fluctuation analysis

The main goal of this work is to consider the detrended fluctuation analysis (DFA), proposed by Peng et al. [Mosaic organization of DNA nucleotides, Phys. Rev. E. 49(5) (1994), 1685–1689]. This is a well-known method for analysing the long-range dependence in non-stationary time series. Here we describe the DFA method and we prove its consistency and its exact distribution, based on the usual i.i.d. assumption, as an estimator for the fractional parameter d. In the literature it is well established that the nucleotide sequences present long-range dependence property. In this work, we analyse the long dependence property in view of the autoregressive moving average fractionally integrated ARFIMA(p, d, q) processes through the analysis of four nucleotide sequences. For estimating the fractional parameter d we consider the semiparametric regression method based on the periodogram function, in both classical and robust versions; the semiparametric R/S(n) method, proposed by Hurst [Long term storage in reservoirs, Trans. Am. Soc. Civil Eng. 116 (1986), 770–779] and the maximum likelihood method (see [R. Fox and M.S. Taqqu, Large-sample properties of parameter estimates for strongly dependent stationary Gaussian time series, Ann. Statist. 14 (1986), 517–532]), by considering the approximation suggested by Whittle [Hypothesis Testing in Time Series Analysis (1953), Hafner, New York].     

Linking aggregate production planning with marketing pricing decisions

In this paper, we link production planning decisions to marketing decisions that involve the price of product groups. The focus of this paper is the development of a closed-loop procedure for aggregate production planning and pricing. We seek to satisfy uncertain demand while minimizing total costs that include material, labour, and inventory holding costs. The procedure is useful for variable demand to update short-term aggregate plans.