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This paper has examined the behavior of the exchange rate of the Indonesian rupiah against the U.S. dollar. Four different models have been tested in empirical work. In the PPP model, based on the value of adjusted R2, the standard error of the coefficient, and the mean absolute percent error, the regression with the relative PPI shows better results than the regression with the relative CPI. In the uncovered interest parity, the coefficient of the interest rate differential has a wrong sign and is insignificant whereas the expected exchange rate is positive and highly significant. In the monetary models, the Bils on model and the Frenkel model apply to the IDR/USD exchange rate whereas the Dornbusch model and the Frankel model are not applicable. In the extended Mundell-Fleming model, more real money supply, a smaller government spending/GDP ratio, a lower stock price, a higher domestic interest rate, and a higher expected inflation rate would cause the rupiah to depreciate. Excluding the UIP model, the monetary models and the extended Mundell-Fleming model exhibit smaller forecast errors than the PPP model. Based on the value of adjusted R2 and the correct sign and significance of the coefficients, the Bilson model performs best
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