Some parameters chain may deviate from the expectancy value or average in the supply chain, such as demand, price, cost, and so on, and then there is a variance risk.
供应链中的某些参数，如需求、价格、成本等可能偏离供应链的预期值或者平均值，这就产生了供应链方差风险。
The material price variance measures the difference between the actual cost of material and the standard cost expected to be paid for the material.
材料的价格差异是材料的实际价格与预期的标准价格之间的差额。
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