Abstract
AbstractThis article selects nearly eight years’ monthly average potato prices index in four areas. According to the standard VAR model steps, this paper adopts a four-variable VAR model to study the potato price index’s dynamic interaction in different regions. Based on this model, we conducted impulse response analysis, variance decomposition, and Granger causality test. There are three main research findings. First, The monthly average potato prices in various regions have a predictive effect on each other. Second, After the monthly average potato price in various regions generated pulses, the monthly average potato price in this region and other regions will be affected in the next few months. The impact of this pulse will gradually decrease after reaching its peak. Third, the change of the national monthly average potato price is mainly influenced by its own price. The other three regions’ monthly average potato price change is also primarily influenced by the national monthly average potato price.KeywordsMonthly average potato pricesVARGranger causality testImpulse responseVariance decomposition
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