Problem
Currently, the average price of a Big Mac is RMB 22.50 in China and $5.20 in the U.S. The actual exchange rate is RMB 6.50/$. Answer the following questions:
i. Where are hamburgers cheaper, in China or U.S.?
ii. Calculate the PPP-implied exchange rate, based on the law of one price.
iii. Based on the PPP, is the Chinese yuan overvalued or undervalued, and by how much?