Submitted by Cristiane Shirayama (cristiane.shirayama@fgv.br) on 2011-05-31T15:00:03Z No. of bitstreams: 1 63090100006.pdf: 1094712 bytes, checksum: 977dab8c82f44b506e1fc9eb0c160c62 (MD5) / Approved for entry into archive by Suzinei Teles Garcia Garcia(suzinei.garcia@fgv.br) on 2011-05-31T15:47:01Z (GMT) No. of bitstreams: 1 63090100006.pdf: 1094712 bytes, checksum: 977dab8c82f44b506e1fc9eb0c160c62 (MD5) / Approved for entry into archive by Suzinei Teles Garcia Garcia(suzinei.garcia@fgv.br) on 2011-05-31T15:48:07Z (GMT) No. of bitstreams: 1 63090100006.pdf: 1094712 bytes, checksum: 977dab8c82f44b506e1fc9eb0c160c62 (MD5) / Made available in DSpace on 2011-06-01T16:42:33Z (GMT). No. of bitstreams: 1 63090100006.pdf: 1094712 bytes, checksum: 977dab8c82f44b506e1fc9eb0c160c62 (MD5) Previous issue date: 2011-04-08 / Neste trabalho abordamos alguns "puzzles" da Paridade do Poder de Compra (PPC) ainda não resolvidos; durante esse processo propomos um novo modelo não-linear e estudamos o papel da agregação temporal e de bases de dados abrangendo apenas um pequeno período histórico. A hipótese de que não existe uma força de convergência agindo sobre o câmbio real ajustado (ARER) foi fortemente rejeitada estatisticamente, e a não-linearidade se mostrou um questão importante. As meia-vidas encontradas para o Brasil usando os modelos padrão parecem ser uma das menores já encontradas para um país, e chegamos à conclusão de que a velocidade de convergência em direção a PPC ainda não pode ser considerada um consenso. Pretendemos, em adição, dar contribuições através do levantamento e esclarecimento de alguns resultados e problemas potenciais concernentes ao estudo da PPC. / In this work we address some unresolved purchasing-power parity (PPP) puzzles; during the process we propose a new nonlinear model and check the role of temporal aggregation and of datasets covering only a small period of time. The hypothesis that there is no convergence force acting on ARER has been strongly statistically rejected and the nonlinearity showed itself as an important issue. The half-lives found for Brazil using standard models seem to be one of the smallest ever found for a country. However, we concluded that the speed of converge towards PPP is not a consensus yet. Besides, we expect to give contributions to PPP literature by pointing out important results and potential pitfalls on PPP research.

The inability to effectively hedge against unfavourable exchange rate movements, using the current forward exchange rate as the only guideline, is a key inhibiting factor of international trade. Market participants use the current forward exchange rate quoted in the market to make decisions regarding future exchange rate changes. However, the current forward exchange rate is not solely determined by the interaction of demand and supply, but is also a mechanistic estimation, which is based on the current spot exchange rate and the carry cost of the transaction. Results of various studies, including this study, demonstrated that the current forward exchange rate differs substantially from the realized future spot exchange rate. This phenomenon is known as the exchange rate puzzle. This study contributes to the dynamics of modelling exchange rate theories by developing an exchange rate model that has the ability to explain the realized future spot exchange rate and the exchange rate puzzle. The exchange rate model is based only on current (time t) economic fundamentals and includes an alternative approach of incorporating the impact of the interaction of two international financial markets into the model. This study derived a unique exchange rate model, which proves that the exchange rate puzzle is a pseudo problem. The pseudo problem is based on the generally excepted fallacy that current non–stationary, level time series data cannot be used to model exchange rate theories, because of the incorrect assumption that all the available econometric methods yield statistically insignificant results due to spurious regressions. Empirical evidence conclusively shows that using non–stationary, level time series data of current economic fundamentals can statistically significantly explain the realized future spot exchange rate and, therefore, that the exchange rate puzzle can be solved. This model will give market participants in the foreign exchange market a better indication of expected future exchange rates, which will considerably reduce the dependence on the mechanistically derived forward points. The newly derived exchange rate model will also have an influence on the demand and supply of forward exchange, resulting in forward points that are a more accurate prediction of the realized future exchange rate. / Thesis (Ph.D. (Risk management))--North-West University, Potchefstroom Campus, 2011.

The inability to effectively hedge against unfavourable exchange rate movements, using the current forward exchange rate as the only guideline, is a key inhibiting factor of international trade. Market participants use the current forward exchange rate quoted in the market to make decisions regarding future exchange rate changes. However, the current forward exchange rate is not solely determined by the interaction of demand and supply, but is also a mechanistic estimation, which is based on the current spot exchange rate and the carry cost of the transaction. Results of various studies, including this study, demonstrated that the current forward exchange rate differs substantially from the realized future spot exchange rate. This phenomenon is known as the exchange rate puzzle. This study contributes to the dynamics of modelling exchange rate theories by developing an exchange rate model that has the ability to explain the realized future spot exchange rate and the exchange rate puzzle. The exchange rate model is based only on current (time t) economic fundamentals and includes an alternative approach of incorporating the impact of the interaction of two international financial markets into the model. This study derived a unique exchange rate model, which proves that the exchange rate puzzle is a pseudo problem. The pseudo problem is based on the generally excepted fallacy that current non–stationary, level time series data cannot be used to model exchange rate theories, because of the incorrect assumption that all the available econometric methods yield statistically insignificant results due to spurious regressions. Empirical evidence conclusively shows that using non–stationary, level time series data of current economic fundamentals can statistically significantly explain the realized future spot exchange rate and, therefore, that the exchange rate puzzle can be solved. This model will give market participants in the foreign exchange market a better indication of expected future exchange rates, which will considerably reduce the dependence on the mechanistically derived forward points. The newly derived exchange rate model will also have an influence on the demand and supply of forward exchange, resulting in forward points that are a more accurate prediction of the realized future exchange rate. / Thesis (Ph.D. (Risk management))--North-West University, Potchefstroom Campus, 2011.