求翻译：The oil price is also a big risk, mainly because the Bush administration appears determined to attack Iran. The probability of war could easily push the oil price back into the $45-$50 a barrel range for at least a few months. In effect, that would impose a big new tax on consumer spending and corporate profits. The prospect of monetary tightening and a sharp increase in the oil suggests that late 2006 and early 2007 could be a period of great volatility for the US economy是什么意思？

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