Expectation dispersion warns of inflation de-anchoring in real time
South African private sector inflation expectations gained durability over 25 years of targeting, while survey dispersion provided real-time early warnings of de-anchoring risks. A South African Reserve Bank working paper published the five-metric evaluation on October 8, 2026.
Early signals from survey tails
Quarterly microdata from the Bureau for Economic Research spanning 2000 to 2025 shows private expectations adapting through five policy phases.
Expectations moved from volatility in the first targeting decade to clustering at the 6.0 percent ceiling between 2011 and 2017.
After the central bank communicated a 4.5 percent midpoint preference in 2017, analysts and trade unions adjusted within 10 and 11 quarters, while firms adapted gradually.
Cross-sectional dispersion and parametric skew-t distributions detected upside risks before mean forecasts shifted.
Following temporary drift during the 2021–2023 shock, expectations realigned near 4.5 percent and started converging toward the new 3.0 percent target.
Diagnostic tools and structural divides
The authors distinguish between real-time indicators and ex-post diagnostics across three survey groups.
Dispersion and rounding-based uncertainty metrics provide early warnings, while forecast revisions and horizon sensitivity serve as ex-post tests.
Financial analysts report forecasts on a fine 0.25 percentage point grid and resist short-term shocks.
Conversely, firms and trade unions round to wider 0.5 and 1.0 intervals, displaying short-to-long feedback coefficients between 0.6 and 0.75.
Aggregate averages breed complacency
Central banks that monitor only aggregate averages risk mistaking surface stability for genuine credibility.
Because price-setting firms remain highly sensitive to short-term shocks, uniform signals fail.
The new 3.0 percent target will require tangible outcomes rather than verbal guidance.