The fixed reference price may be adjusted for quality differences as necessary.

如必要，可按质量差异调整固定参考价格。

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Due to differences in the quality too much, the price varies widely.

由于质量差异太大，价格差别也很大。

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He recommends that exporters make sure that price differences in rich and poor markets reflect real differences in quality, or differences in the extra services attached.

ECONOMIST: Pricing strategies

Unnecessary differences in various costs would be eliminated by a genuine market where people had price and quality information.

FORBES: Newt Gingrich