正因为这种复杂性以及人们认识水平的限制，世界各国对转售价格维持的适用原则处于不断变化中。

Just because of the complexity in itself and our understanding limitation, the principles applied to Resale Price Maintenance are ever-changing.

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在平衡紧张和商业石油库存量仍然较低的情况下，去年的各种价格信号清楚地说明了维持生产和扩大生产能力的必要性。

With a tight balance and commercial oil stocks still relatively low, price signals over the past year have made clear the need to sustain production and expand capacity.

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限制性定价策略是否总是优于下面的策略还不清楚，即当前维持比较高的价格(和利润)，但随着进入的发生而下降。

It is not clear whether this strategy is always superior to one where current prices (and profits) are higher, but decline over time as entry occurs.

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