By using a concept of adaptive expected output and modern control theory, a dynamic adaptive Cournot model, which the inversedemand curve function is nonlinear in the market, is established.
If the supply and demand condition is stable, then gold and the dollar have an inverse relationship.
如果黄金的供给和需求状况是稳定的，那么黄金和美元有反比关系。
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Secondly, apparel product is imperishable fashion product that means the decrease demand significantly at the end of selling season, i. e. its value is inverse rate with time.