In fact, most dollar commodity prices have fallen since the first half of the year. Though a host of sector-specific factors affect the price of each commodity, the fact that the downswing is so broad – as is often the case with big price swings – suggests that macroeconomic factors are at work.
但这不是故事的全部。铁矿石价格也在下跌。金、银和铂价格也是如此。糖、棉花和大豆价格也在下跌。事实上，大部分大宗商品的美元价格今年上半年都下降了。尽管一些具体的部门因素影响着每种商品的价格，但价格下跌是如此广泛&mdash;&mdash;剧烈波动时往往会发生这种情况&mdash;&mdash;这一事实表明有宏观经济因素在起作用。