统计研究 ›› 2013, Vol. 30 ›› Issue (8): 63-68.

• 论文 • 上一篇    下一篇

猪肉价格波动的非对称性及其对CPI的影响

冯明   

  • 出版日期:2013-08-15 发布日期:2013-08-05

The Asymmetric Volatility of Pork Price and Its Impact on CPI

Feng Ming   

  • Online:2013-08-15 Published:2013-08-05

摘要: 本文运用2001-2012年的月度数据,通过GARCH簇模型对猪肉价格波动的异方差性进行研究。分析发现,与牛、羊、鸡等其他几类在我国居民生活中占有重要位置的肉类价格相比,猪肉价格的波动有独特之处。除了波动幅度大、呈明显的周期性之外,猪肉价格波动还存在显著的非对称性:即正向冲击引发的价格波动要显著大于负向冲击引发的价格波动。本文创新性地提出“调整的”适应性预期理论,对猪肉价格波动非对称性的经济学意义给出解释。由于猪肉在居民消费品价格指数(CPI)篮子中占有比较大的权重,这些结论对我国通胀治理政策有重要意义。

关键词: 猪肉价格, 非对称性, CPI, GARCH

Abstract: In this article, Exponential Generalized Autoregressive Conditional Heteroscedasticity (E-GARCH) models and Threshold Generalized Autoregressive Conditional Heteroscedasticity (T-GARCH) models are applied to analyze the heteroscedasticity of pork price in China. Specifically, the monthly data between 2001 and 2012 is used. The estimation results indicate that, compared with beef, lamb, and chicken prices, pork price has several outstanding characteristics: (1) is much more volatile, (2) shows cyclical fluctuation, and most importantly, (3) its volatility is asymmetrical. In detail, a positive shock may cause larger pork price volatility than a negative shock. Furthermore, the asymmetry of pork price volatility could be explained with the “adjusted adaptive price expectation theory”. Since pork has a heavy weight in China’s Consumer Price Index basket, the findings in our paper is closely related to the trend and volatility of China’s CPI.

Key words: Pork Price, Asymmetry, CPI, GARCH