在2007 - 08年小麦价格持续上升了数月；与此相对，现今小麦价格波动剧烈反复无常。

In 2007-08 prices rose continuously for months. In contrast, prices recently have been volatile.

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尽管过去几年的价格持续上升，但由于所持有的房屋价格的攀升，消费者并未太察觉到价格的上涨。

Though prices have been climbing for the last few years, consumers didn't feel it as much in the past because their home values were soaring.

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因此，当商品和资产价格快速增长的时刻，正是由于缺乏足够的做空投机客们才使得价格持续上升并使得这些价格最终崩溃。

Therefore, it was the absence of sufficient short speculators when commodity and asset prices were rising sharply that helped widen the run up and eventual collapse in these prices.

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