They are the price of one currency in terms of another and, like the price of anything, when exchange rates change, supply and demand changes.

他们像任何东西的价格一样，是一种货币对另一种货币的价格，汇率变化时，供给和需求也会产生变化。

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Hence, with no change in the current demand for oil, the expectation of a greater future demand and a higher future price caused the current price to rise.

因此，在当前石油需求状况没有变化的情况下，对未来需求增长以及油价上涨的预期导致了当前油价走高。

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As concern over climate change improves the prospects for nuclear power, uranium demand has outpaced supply and speculative buying has forced the price up to $85 per pound, from $10 in 2003.

由于人们认为气候的变化会促进核能的发展前景，现在铀已经是供不应求，而且对铀的投机性购买已使铀价格从2003年的一磅10美元涨到85美元。

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That price change will reduce demand and thus supply and demand will balance.

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Ali Rodriguez Araque, OPEC's secretary-general, has pointed out that the change in price is not the result of any change in the balance of supply and demand for oil, and he also said that OPEC has no intention of manipulating the price or supply of oil for political reasons.

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So if demand at a price changes but available supply does not then it is price which will change in order to balance supply and demand.

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