Ms. Economist always tries to travel to a country where the purchasing power parity exchange rate is

Question:

Ms. Economist always tries to travel to a country where the purchasing power parity is lower than the market Why?
Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...