Abstract
This article conducts empirical research of the state of balance (equal), in regards to simultaneous interest rates across different countries around the globe. It provides a clear insight and reasons for the disagreement between the PPP and IRP. This article also contains the valuation and computation of PPP using the Big Mac index to compare 10 countries’ local currency against the dollar (Japan, Thailand, United State, Canada and China etc.). This way we can find out if the currency is overvalued or undervalued. The result from the overall research provides, the connection, disagreement between PPP hypothesis and IRP hypothesis and reasons why international parity holds in some countries plus why it works better with countries with higher inflation rate and underdeveloped capital market, it also discloses the law of one price as an unrealistic theory.
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