Based on margin pricing theory, a new mathematic model is proposed for reactive power pricing taking voltage security risk into account.

基于边际价格理论，提出考虑系统电压安全风险的无功定价数学模型。

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However, possible commodity inflation and the rising value of Dollar vis-a-vis Euro may pose profit margin and pricing challenges for Heinz in future year.

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Oil, technology and basic industrials are suffering margin contraction from pricing and weakening revenues.

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The company managed to leverage its pricing at the margin, raising revenue per unit 10% compared with a volume growth of 3% in the quarter.

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