In recent years, Vietnam has always maintained a policy of floating exchange rates regulated (managed floating). Many local policymakers assess this is a policy consistent with the context of Vietnam's economy in the present time when the openness of the economy is very high in the financial system are not timely completion adjustment. The maintenance of the exchange rate regime will help curb the help limit negative effects for regional commercial and non-commercial. Besides, maintaining stability in international balance of payments, financial stability, and economic growth. However, the last time, Vietnam's economy is also facing the situation of high inflation rate, the proportion of imports in GDP is growing and growing pressure from foreign capital inflows. Therefore, this will make the real effective exchange rate will fluctuate too fast and too much, may be out of control, causing instability in the balance of internal and external balance of the economy. Real exchange rate overvalued or low are not good for the overall balance of the economy. Real exchange rate is undervalued will make prices of imported goods rise and cause inflation. The exchange rate overvalued real will reduce the competitiveness of domestic goods. Therefore, the calculation of the deviation of the real exchange rate is a really important issue and needed, highly significant in economic policy of the country. This is also the aim of this study.
The issue of bias in the estimates of real exchange rates in effect will always be the subject being studied and debated by many scholars over the decades. However, it seems that the idea of it is quite meager. Have to say, if the matter considered as "black box", the study will make the "white goods" part of the "black box" by offering real effective exchange rate and balance brought against comparable to the real exchange rate in effect at each time of the study.
However, unlike previous studies, this study has the new findings indicate that is the most important factor causing false of REER deviation from which to make specific policy implications in order to narrow the gap obsolete.
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