Monetary Policy, Inflation, and Distributional Impact: South Africa’s Case

IMF Working Papers, March 19, 2021

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Monetary policy tightening aimed at maintaining low and stable inflation can reduce consumption inequality over a 12–18 month horizon.
In response to “exogenous” monetary policy tightening:
- The real consumption of individuals at lower ends of the consumption distribution declines relatively modestly, or even increases.
- The real consumption of individuals at higher ends of the consumption distribution is more likely to decline.
The differential effects reflect distinct income and expenditure structures across the consumption distribution:
- Lower-end individuals rely more on government transfers, have smaller reliance on labor income, and have relatively larger food consumption — leading them to benefit mainly from lower inflation.
- Higher-end individuals are more exposed to lower labor income, weaker asset price performance, and higher debt service cost.

Inflation channel: Lower inflation resulting from tightening benefits those with larger shares of food consumption and transfer-based incomes.
Income channel: Tighter monetary policy leads to weaker labor income, which disproportionately affects higher consumption deciles dependent on labor income.
Asset and debt channel: Weaker asset price performance and increased debt service costs reduce real consumption for higher-end individuals.

The paper interprets a 12–18 month horizon as the transmission lag of monetary policy action to the real economy and notes this is similar to the distance between survey waves used in the analysis.
The analysis focuses on responses to “exogenous” monetary policy tightening.

Pursuing monetary policy that keeps inflation low and steady can have distributional benefits by reducing consumption inequality within the identified transmission horizon.
Policymakers should account for heterogeneous household exposures:
- Households relying on transfers and food consumption can gain from lower inflation.
- Households more reliant on labor income, assets, and debt may bear larger consumption costs from tightening.

Central bank policy rate; Consumption; Consumption decile; Consumption ratio; Distributional effects; Food consumption; Household consumption; Income inequality; Inflation; Monetary policy; Monetary policy shock; South Africa.

Monetary Policy, Inflation, and Distributional Impact: South Africa’s Case — Ken Miyajima (IMF Working Paper)