Um teste de paridade coberta de juros, ajustada por prêmio de risco, para a economia brasileira entre 2007 e 2010
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Data
2012-02-07
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Maiali, André Cury
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Resumo
The concept of covered interest parity imply that, in the absence of arbitrage barriers between two markets, the interest differential among two assets, identical in all relevant aspects, excepted by the reference currency, in the absence of currency risk must be equal to zero. However, since there is any non-diversified risk, represented by the country risk, typical of emerging market economies, the investors will require a higher interest rate than the actual difference between the local and foreign interest rate. The purpose of this study is to evaluate if the adjustment of the covered interest parity condition by risk premium is sufficient to validate the non-arbitrage condition to the Brazilian market, during the period between 2007 and 2010. The country risk affect all the assets issued for a specific economy and can be described as the sum of the default risk (or sovereign risk) plus the convertibility risk perceived by the market. In order to estimate the non-arbitrage equation were used regressions such as Ordinary Least Squares, Time-Varying Parameters (TVP) and Recursive Least Squares, and the results were not conclusive in regards the validation of the covered interest parity, even adjusted by the risk premium. Measurement errors, transaction cost and interventions and restrictive policies on the foreign exchange market might be contributed to such result.