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Over the last 25 years, Brazil has been among the countries with the highest interest rates globally. High interest rates have been necessary during several recent times, such as in the period from 1997 to 1999, due to the repeated international financial crises that have plagued the country. From 1999, a sustained path of interest rate reduction begun. With the outbreak of the 2008 international financial crisis, the Brazilian monetary authorities promoted a new round of falling domestic interest rates in response to the recessive effects and the threat of a systemic crisis that could hang over the national financial system. In 2012, a set of interventionist nature policies led to a decrease in the Selic rate. Thus, looking at the last 25 years, it appears that many factors have started to influence the trajectory of Brazilian interest rates. In this context, the present work aims to identify, based on empirical research, the determinants of spot and future interest rates. As a methodology, the research uses a multivariate econometric vector autoregressive model (VAR) with error correction (VEC). The analysis covers the years 2017 to 2019, corresponding to the period in the aftermath of the global financial crisis of 2008. The results evidence that both the spot rate and the DI future can be determined by the fluctuations in the level of inflation and by the level of activity and the real exchange rate, in addition to the effects of the lagged variables themselves.

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