According to the purchasing power parity theory, what should the exchange rate reflect in the long run?

Question

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According to the purchasing power parity theory, the exchange rate should reflect differences in price levels in the long run. In other words, the exchange rate should adjust in a way that equivalent goods in different countries have the same price when converted into a common currency. This reflects the idea that currencies should maintain their purchasing power parity over time, meaning that the same amount of goods should be able to be purchased with the same amount of currency in different countries. Differences in inflation rates or interest rates may affect exchange rates in the short run, but in the long run, the exchange rate should reflect differences in price levels.

According to the Purchasing Power Parity Theory, What Should the Exchange