A can of soda costs $1.50 in the United States and 24 pesos in Mexico. Assume purchasing-power parity holds. The peso-dollar exchange rate is 16 pesos per dollar.
Purchasing Power Parity = Cost of good X in currency 1 / Cost of good X in U.S. dollar.
peso-dollar exchange rate = 24/1.5 = 16 pesos per dollar
expansion causes all prices in Mexico to doubl:
peso-dollar exchange rate = 48/1.5 = 32 pesos per dollar
A monetary expansion causes all prices in Mexico to double, so that the price of soda in Mexico rises to 48 pesos. The peso-dollar exchange rate is now 32 pesos per dollar.
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