Speculation is generally defined as bets placed on future prices of assets or commodities.

投机行为的一般定义是为资产或商品的未来价格下注。

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They sell in part to speculators who hope to profit from any difference between the prices in futures markets and actual future prices.

他们将一部分出售给投机家，而投机家也希望从期货市场价格和将来实际价格之间的任何差异中获利。

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Of course, a rise in the spot price of oil triggered by a change in expectations about future prices will cause a decline in the current quantity of oil that consumers demand.

当然，由未来油价预期引发的现货油价上涨会促使当前石油需求量下降。

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The Russian president says budget plans should be based on conservative estimates of future prices for raw materials.

VOA: standard.2009.05.25

The former president says that merchants see a bleak economic future for Iran because of rising prices, lack of investment,lower oil revenues and the elimination of price controls.

VOA: standard.2010.07.20

Because future prices are hard to predict, this yield measurement is only an estimation of return.

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Meanwhile production costs continue to rise, meaning future prices must be still higher for sales to be profitable.

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This has pushed down current prices and pushed up future prices of pork.

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