Three percent inflation target withstands standard economic shocks
A proposed 3 percent inflation target would keep price growth between 2 percent and 4 percent across 62 percent of multi-shock scenarios, according to South African Reserve Bank research published in September 2026.
Simulating one hundred thousand paths
Stress tests using the central bank's Quarterly Projection Model indicate that a 3 percent inflation anchor can absorb typical economic disruptions.
Across 100,000 simulations over a 10-quarter horizon, headline inflation remains between 2 percent and 4 percent in 62 percent of combined shock cases.
Under standalone one standard deviation shocks across all main drivers, annual inflation deviates by less than 1 percentage point over a one-year horizon.
Moving inflation outside this 1 percentage point band requires substantial shocks, such as a 14 percent rand depreciation or a 46 percent oil price increase.
Extended disturbances, including currency weakness lasting 6 quarters or elevated oil prices persisting for 4 quarters, are also required to cause annual breaches.
Expectations decouple from past price shifts
South Africa maintained a 3 to 6 percent target range since 2000, explicitly focusing on the 4.5 percent midpoint from July 2017.
Average inflation subsequently fell from 6.2 percent between 2000 and mid-2017 to 4.7 percent between late 2017 and mid-2025, alongside a decline in standard deviation from 2.0 percent to 1.29 percent.
Econometric estimates confirm that inflation expectations became increasingly forward-looking after 2017, reducing the weight of historical price movements.
In 2025, the SARB announced plans to calibrate policy forecasts around a 3 percent anchor.
Stronger anchor, narrower margin
The findings confirm that established central bank credibility makes a lower target mathematically resilient to standard shocks.
Yet simulated distributions downplay rigidities in domestic administered prices.
Lasting success will require structural fiscal discipline rather than monetary resolve alone.
Source: Stress testing the 3% inflation target
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