http://story.news.yahoo.com/news?tmpl=story&cid=573&ncid=757&e=4&u=/nm/20030425/od_nm/economy_china_yuan_dc
The survey found that the average price of a Big Mac was $2.71 in four U.S. cities and just $1.20 in China, implying that the yuan was undervalued by 56 percent against the dollar.
"In other words, the yuan is the most undervalued currency," The Economist said.
The index is a rough-and-ready measure of a concept that economists call purchasing-power parity, valuing currencies according to what they will buy at home, rather than in international exchange.
The yuan is pegged to the U.S. currency, moving in a very slim band around 8.28 to the dollar. It cannot be exchanged freely for foreign currencies, but can be for sandwiches.
