›› 2019, Vol. 31 ›› Issue (2): 17-35.

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Evolving Efficiency and Noise Trading of China's Copper Futures Market

Ji Junwei1, Fu Qiang2, Zhang Xingmin2   

  1. 1. Business School, Chengdu University of Technology, Chengdu 610059;
    2. School of Economics and Business Administration, Chongqing University, Chongqing 400044
  • Received:2016-11-10 Online:2019-02-28 Published:2019-03-07

Abstract:

Investigating the impact of noise trading on efficiency from the perspective of behavioral finance has become a hot topic in the field of micro finance. This paper studies the evolving efficiency of Shanghai copper futures market and the impact of noise trading on it. We firstly measure the noise trading using EGARCH model, secondly build a state space model to measure the evolving efficiency using Kalman filtering, and finally investigate the impact of noise trading on the efficiency using GARCH model from both first and second moment. Through the empirical study, we find that:the market tends to be weakly efficient, with a distinctive stage characteristic. Specifically, before early June 2013 its market effectiveness is poor and then it gradually improves after beneficial policy was introduced. In the long run, the noise trading weakly enhances the efficiency due to promoting market depth, while in short term, it magnifies the volatility of the evolving efficiency, because it will amplify variance of yield. The results indicates that noise trading isn't the primary cause of copper futures market's inefficiency, but trading system and market environment are likely to be the key factors.

Key words: Shanghai copper futures market, noise trading, evolving efficiency, first and second moment, market depth