Prices change according to supply and demand.

价格根据供应量和需求量而变化。

《柯林斯英汉双解大词典》

The heart of the problem is supply and demand.

问题的核心是供给和需求。

《柯林斯英汉双解大词典》

It also challenges the labor force supply and the pension system.

这也对劳动力供给和养老金制度提出了挑战。

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It can also rob communities of an important food supply and endanger future populations of some kinds of fish.

VOA: special.2009.02.10

Now, the interest rate in Irving Fisher's world has to equate supply and demand in the market for debt.

在费雪的理论里,利率必须与,债券市场的供需关系保持平衡

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uncertainty of the food supply and the like.

而且食物供给也不稳定

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The rising price of fuel is largely a result of an imbalance between supply and demand.

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And Germany conquered inflation by controlling money supply and declaring marks convertible into land.

FORBES: Why Germany Cannot Escape Inevitable Inflation

Moreover, Investec adds, "increasing supply and rising stocks are likely to lead to prices falling".

BBC: Which way for commodities in 2010?