Testing nonlinearities between Brazilian exchange rate and inflation volatilities

• Autor(a) principal: Albuquerque,Christiane R.
• Data de Publicação: 2006
• Outros Autores: Portugal,Marcelo S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Brasileira de Economia (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71402006000400001
• topic: Exchange rate; inflation; volatility; Garch models

There are few studies, directly addressing exchange rate and inflation volatilities, and lack of consensus among them. However, this kind of study is necessary, especially under an inflation-targeting system where the monetary authority must know well price behavior. This article analyses the relation between exchange rate and inflation volatilities using a bivariate GARCH model, and therefore modeling conditional volatilities, fact largely unexplored by the literature. We find a semi-concave relation between those series, and this nonlinearity may explain their apparently disconnection under a floating exchange rate system. The article also shows that traditional tests, with non-conditional volatilities, are not robust.