Abstract: In this paper, cointegration relationship, causal relationship and the error correction model are introduced. Using these models, this paper takes the copper future and aluminum future at Shanghai Metal Exchange and wheat future at Zhengzhou Commodity Exchange as the objects of study to test the causal relationship and cointegration relationship based on the collected data. The result shows that the two series of future price and cash price follow the cointegration relationship. Finally, with given ECMs and analysis of the casual relationship exists between the prices series, we show that we are able to forecast the prices of cash copper and aluminum to a certain extent.
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