But fixed supply will become a constraining factor on economic activity.

但在经济活动中固定的供应将会成为一个约束性的因素。

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These include the fixed supply of natural resources, and the possible negative effects of industry on the natural environment.

这其中包括有限的自然资源供应和工业对环境造成的消极影响。

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Rising house prices, the argument goes, are fully justified by low interest rates, rising real incomes, growing populations and a fixed supply of land.

此种观点认为，房价的上涨完全可以用低利率、实际收入增加、人口增长和数量固定的土地供应来进行合理解释。

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Gold, with a relatively fixed supply they argue, becomes worth more in dollar terms.

FORBES: Why Fed Printing Money Is No Magic Bullet For Gold

ETFs differ from traditional stocks, for which there is essentially a fixed supply of shares.

WSJ: No Need to Avoid All Low-Volume ETFs

And with no fixed supply of raw material, unlike stocks or bonds, bets could be almost limitless.

ECONOMIST: Credit derivatives