Last week, the Iranian rial continued its historic slide, falling to a record low against the U.S. dollar. Over the course of the week, the price of one dollar in Tehran rose from 34,200 rials to 37,500 -- a 10% drop in the rial's value. In fact, the currency has lost 75% of its value in one year. In late 2011, the price of the dollar was 13,000 rials. The latest slide in the value of the rial may well have been expected given recent trends, but the severity and speed of the drop surprised many... prices in Iran have...