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ABSTRACT This paper investigates the drivers of long term real interest rates in Brazil. It is shown that long term yield on inflation linked bonds are driven by yields on 10 year interest rates of United States (US) government bonds and 10 year risk premium, as measured by the Credit Default Swap (CDS). Long term interest rates in Brazil were on a downward trend, following US real rates and stable risk premium, until the taper tantrum in the first half of 2013. From then onwards, real interest rates rose due to the increase in US real rates in anticipation of the beginning of monetary policy normalization and, more recently, due to a sharp increase in Brazilian risk premium. Policy interest rates do not significantly affect long term real interest rates.

This paper reviews the main theories of interest rate determination and studies the dynamics of the real interest rate in US. Using cointegration techniques we search for equilibrium relationships between the real interest rate, monetary factors and real factors and we study how these relationships change with the policy regimes. We analyze monthly US data since early 20th century and find equilibrium relationships between a measure of the real interest rate, the policy interest rate and industrial production growth only after the end of the Bretton Woods. Moreover, we find that the equilibrium relationships between these variables are not invariant to changes in the monetary policy regime.

We use cointegration tests that determine endogenously the regime shift to test for bilateral short‐term and long‐term real interest rate convergence in the European Monetary System in the 1979–1993 period. The results of these tests provide strong evidence in favour of bilateral real interest rate convergence between Germany and several countries in our sample, particularly for long‐term real interest rates. This result carries the important policy implication that in several European countries monetary policy has lost some of its effectiveness as a stabilisation policy tool.