Should the South African Reserve Bank lower the inflation target band? Insights from the GDP-inflation nexus

Abstract

Should the South African Reserve Bank (SARB) lower the inflation target (IT) band? Does lowering the IT band impact the relationship between GDP growth and inflation? This paper explores these questions considering the SARB Governor, Lesetja Kganyago statements that there is a need to lower the IT band from 3–6% to a point target of 3%. We estimate the VAR model to determine whether the passthrough of positive GDP growth shocks to inflation is nonlinear in South Africa. The inflation effects are delineated into bands (i) above 6% (ii) between 4.5% and 6% (iii) between 3% and 4.5% (iv) between 0% and 3% and (v) when there are no IT bands. Evidence reveals that the passthrough is elevated when inflation exceeds 6% and is lower when inflation is within the (i) 3 to 4.5% and (ii) 0 to 3% IT bands. The passthrough from positive GDP growth shocks is more than halved when inflation is less than 3%. The policy implication is that lowering the IT band from 3 to 6% to 0 to 3% will reduce the passthrough of GDP growth shocks to inflation. It allows expansionary monetary to have more real effects as prices are more rigid in the low inflation environment.