The world economic field thinks that if the price of crude oil rises to 47 USD per barrel, the commercial significance in development and utilization of reproducible energy will be obvious;

世界经济界认为， 如果原油价格升至每桶47美元，开发利用可再生能源的商业意义就得以显现；

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You might say if I decide to turn on the oil spigot overnight to pay the debt, because the oil field is so big, it would send the oil price shooting down, and so it might not be so easy to repay the debt.

FORBES: How Fiat Money Relates To The Government's Cash Flow Statement

Its bosses believe that they have found an oil field, but they know neither how much oil it contains nor what the price of oil will be once they are ready to pump.

ECONOMIST: Economics focus

The fall in the oil price, and the realisation that not much will be pumped from the new field until 2013, have cooled the fever.

ECONOMIST: Petrobras sets some ambitious targets