Infographic 24 in our #Dailychart Advent calendar looks at our Big Mac Index.
Our fun guide to whether currencies are at their "correct" level shows that the average price of a Big Mac in America in July 2013 was $4.56 and in China it was only $2.61 at market exchange rates.
So the "raw" Big Mac index says that the yuan was undervalued by 43% at that time
Interactive currency-comparison tool
Global exchange rates, to go