Prices for many commodities have doubled over the past couple of years. Oil prices have risen almost 400% in the last five years. The proximate cause is a global economic boom that has been stronger, longer, and more broad-based than any in modern history.
当然，不仅是石油价格高，金属、食物以及软木等所有基本食品价格都很高。在过去几年时间里，许多基本商品的价格都已经翻番。过去五年中石油价格上涨几乎400%。最为主要的原因就是全球经济繁荣要比现代历史上的任何一次都要强劲、长远以及更为广泛。