Optimal monetary policy reaction function in a model with target zones and asymmetric preferences for South Africa

This paper estimates the optimal response of the SARB to deviations of inflation and output from their target values over the inflation targeting era. This is achieved using an empirical framework that allows the central bank's policy preferences to be zone-like and asymmetric. The first major finding is that the monetary authorities' response towards inflation is zone symmetric. That is, they react in a passive manner when inflation is within the target band whereas they become increasingly aggressive when it deviates from the target band. The monetary authorities also react with the same level of aggressiveness regardless of whether inflation overshoots or undershoots the inflation target band. The second major finding is that the monetary authorities' response to output fluctuations is asymmetric. That is, they react more aggressively to negative deviations of output from the potential so that they weigh business cycle recessions more than expansions.     

ZONE‐TARGETING MONETARY POLICY PREFERENCES AND FINANCIAL MARKET CONDITIONS: A FLEXIBLE NON‐LINEAR POLICY REACTION FUNCTION OF THE SARB MONETARY POLICY

We estimate a flexible model of the monetary policy reaction function of the South African Reserve Bank based on a representation of the policymaker's preferences that capture asymmetries and zone‐targeting behaviours. We augment the analysis to allow for responses to financial market conditions over and above inflation and output stabilisation to address the current debate on the importance of financial asset prices in monetary policy decision making. The empirical results show that the monetary authorities' response to inflation is zone symmetric. Secondly, the monetary authorities' response to output is asymmetric with increased reaction during business cycle downturns relative to upturns. Thirdly, the monetary authorities pay close attention to the financial conditions index by placing an equal weight on financial market booms and recessions.