Exchange rate provides a key link between the domestic and world markets for goods and assets. Therefore, a proper and detailed analysis of the behaviour of exchange rate is required. There is also growing agreement that prolonged and substantial exchange rate misalignment can create severe macroeconomic disequilibria and the correction of external balance will require both exchange rate devaluation and demand management policies. Thus the policy-makers have used PPP theory as a guide to represent the external competitiveness of a country, and as a benchmark against which floating exchange rates are judged to be misaligned. Developments in 1990s and 2000s show that cost associated with exchange rate misalignment is very high. Hence, the analysis of exchange rate determination in the presence of exchange rate misalignment is crucial for the policy purpose because of its role as a component of an early warning system [Berg, et al. (2000)].