The relationship between international crude oil prices and China＇s refined oil prices based on a structural VAR model

With the frequent fluctuations of international crude oil prices and China＇s increasing dependence on foreign oil in recent years, the volatility of international oil prices has significantly influenced China domestic refined oil price. This paper aims to investigate the transmission and feedback mechanism between international crude oil prices and China＇s refined oil prices for the time span from January 2011 to November 2015 by using the Granger causality test, vector autoregression model, impulse response function and variance decomposition methods. It is demonstrated that variation of international crude oil prices can cause China domestic refined oil price to change with a weak feedback effect. Moreover, international crude oil prices and China domestic refined oil prices are affected by their lag terms in positive and negative directions in different degrees. Besides, an international crude oil price shock has a signif- icant positive impact on domestic refined oil prices while the impulse response of the international crude oil price variable to the domestic refined oil price shock is negatively insignificant. Furthermore, international crude oil prices and domestic refined oil prices have strong historical inheri- tance. According to the variance decomposition analysis, the international crude oil price is significantly affected by its own disturbance influence, and a domestic refined oil price shock has a slight impact on international crude oil price changes. The domestic refined oil price variance is mainly caused by international crude oil price disturbance, while the domestic refined oil price is slightly affected by its own disturbance. Generally, domestic refined oil prices do not immediately respond to an international crude oil price change, that is, there is a time lag.

人口城市化与产业结构变迁——基于湖南省的实证检验

本文从城市化与产业结构优化的关系出发运用基于VAR模型的动态计量经济方法对湖南省人口城市化对产业结构优化的作用进行了实证研究。实证结果表明城市化对于产业结构具有长期效应。产值结构上表现为城市化对第一产业具有持久的负向影响,但对第二产业具有长期稳定的正向影响,对第三产业的影响具有时滞性;就业结构上表现为对第一产业有着长期的负向效应,对第三产业具有持久的正向效应,但与第二产业长期关系不显著。整体来看,城市化在促进湖南经济的发展、推动产业结构优化升级中发挥着重要的作用。由此提出相关的政策建议。

江西省城市化与生态环境关系的动态计量分析

以江西省为例,在对城市化综合水平与生态环境综合质量进行测度的基础上,利用协整检验、格兰杰因果检验、脉冲响应函数及方差分解模型,对其城市化与生态环境之间的关系进行了动态计量分析。研究显示:①改革开放以来,江西省城市化综合水平逐步提高,而江西省生态环境综合质量及其分量则呈现出各自变化特征;②江西省城市化综合水平变化是生态环境综合质量、生态环境压力、生态环境响应的格兰杰因果原因,而城市化综合水平提高与生态环境状态变化之间互不为格兰杰因果原因;③江西省生态环境综合质量指数、生态环境压力指数和生态环境响应指数的波动一直受到自身及城市化综合水平的影响,且受城市化综合水平的负冲击影响要小于自身波动的正影响,只是生态环境综合质量指数和生态环境压力指数受自身的影响到第8期以后都基本稳定,而同期生态环境响应指数受城市化综合水平波动的影响则逐步加强。

辽宁省财政支农支出与农业经济增长关系的实证研究——基于VAR模型的分析

以辽宁省为样本,选取1978—2010年的年度数据,利用VAR模型及脉冲响应函数分别追踪了辽宁财政支农支出和第一产业增加值对冲击的动态反应,并通过Granger因果检验确认两变量在时间上的领先和滞后关系。研究结果表明:辽宁财政支农支出与第一产业增加值之间存在长期稳定的均衡关系;财政支农支出的冲击对第一产业增加值始终有正向作用,且这种影响持续增强,同时第一产业增加值的正向冲击也会对财政支农支出增加产生较强的累积效应;从Granger因果检验看,两变量间只存在单向因果关系,即财政支农支出仅在短期才是第一产业增加值的Granger原因。