Theories of Exchange Rate Determination

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Before discussing the economic literature on the relationship between interest rates and exchange rates in full, it will be useful to briefly discuss some of the important theories of exchange rate determination. There are many theories such as the theory of Purchasing Power Purchase Agreement (PPP), the Flexible Price Monetary Model (FPM), Sticky Price Monetary Model (SPM), Real Interest Rate Differential Model (RIRD), and Portfolio Balance Theory (PBT) of exchange rate determination. The PPP to maintain equality between domestic and foreign prices are based on the domestic currency through commodity arbitrage. If the equilibrium is violated, the same commodity after exchange rate adjustment will be sold at different prices in different countries. As a result, commodity arbitrage or buy a commodity at the same time the lower price and sell at the higher prices will lead back to the equilibrium exchange rate.

The FPM, SPM, and RIRD known as model monetarists exchange rate determination. Demand and supply of money is a major determinant of the exchange rate. They also assume that domestic and foreign bonds are equally risky to their expected returns will be equalized which covered interest parity will prevail. Assuming wages in the labour market and commodity prices in the goods market to be perfectly flexible PPP theory continued to hold and the expected return between domestic and foreign bonds with the same risk and the same maturity, FPM argue that the relative money supply, inflation expectations, and economic growth as the primary determinant of the exchange rate in the economy. The SPM, which was first developed by Dornbusch (1976), argues that short-term prices and wages tend to be rigid, investors desire to equalize expec...

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... monetary policy than to alternative measures of default risk. Furthermore, according to Shalishali (2012) by applying the International Fisher Effect (IFE) theory in her research stated that, IFE is an important concept in the fields of economics and finance that links interest rates, inflation and exchange rates.

Bjornland (2008) has find that monetary policy shock now implies a strong and immediate appreciation of the exchange rate. Additionally, he also claimed that the monetary policy shock temporarily lowers output while increasing unemployment and has a negative effect on consumer price inflation. Besides that, Kearns and Manners (2006) find that monetary policy shock will increases the interest rate has a significant appreciating effect on the exchange rate. Thus, an increase in interest rate may have prevented the exchange rate from falling even further.

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