《Table 4 Johansen cointegration test for wheat and maize》

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《An Empirical Study on the Relationship between the Price of Maize and Wheat》

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The unit root test results show that the first-order difference sequence of wheat and maize is a stationary sequence.Therefore，these two variables are first-order single integer sequences and conform to the cointegration test precondition.Therefore，the Johansen cointegration test can be used to check whether there is a long-term and stable equilibrium relationship between the two，and the test results are shown in Table 4.