The value of the glistening commodity, useless for most practical purposes, increased almost 400 per cent, from less than $500 an ounce in 2005 to about $1, 900 in September.

虽然毫无实际用处，这个金光闪闪的商品的价值上涨了400%，从2005年500美元一盎司的价格飙升至9月份的1900美元。