The Prediction Graveyard
Made with ❤️ by Aniruddh JangidLinkedIn
The Graveyard / International Monetary Fund staff

resolved · Honourable Graves

IMF staff forecast South African GDP growth would recover to 0.8% in 2020 under current policies.

Source-backed summary; not presented as a verbatim quotation.

International Monetary Fund staff
Article IV macroeconomic forecasters · South Africa

Made: 2020-01-29Resolved: 2020-12-31
Original conceptual trajectory diagram illustrating No cause of death assigned
Reasoning and outcomes. Original illustration for The Prediction Graveyard. Aniruddh Jangid, 2026. Original digital diagram. CC BY 4.0. Changes: none. This is a conceptual diagram, not an archival image.

The world at the time.

The January Article IV release expected only a lackluster recovery and warned about weak investment and public-enterprise problems. The forecast preceded South Africa’s pandemic lockdowns.

IMF 2019 Article IV conclusionIMF 2021 Article IV conclusionJanuary 2020 World Economic OutlookStatistics South Africa 2020 performance

What happened.

South Africa’s 2020 output contracted instead of growing. The IMF’s February 2022 table reports a revised contraction of 6.4%, compared with the original national release of 7.0%.

IMF 2021 Article IV conclusionStatistics South Africa 2020 performance

Predicted vs actual.

MetricPredictedActualVariance / caveat
2020 real GDP growth+0.8%−6.4% revised IMF estimate−7.2 percentage points
IMF 2021 Article IV conclusionStatistics South Africa 2020 performance

The counter-signal.

The January 20 World Economic Outlook had already downgraded South Africa because structural constraints and deteriorating public finances were holding back confidence. This supported caution about a recovery without forecasting the later pandemic collapse.

January 2020 World Economic Outlook

Verdict.

Reasoning: sound · Outcome: wrong

The sign and magnitude of the point forecast failed. Sound recognizes a cautious baseline with disclosed risks; the pandemic shock does not make the prediction retrospectively correct.

Uses public release date January 29; board consultation concluded January 24. Outcome vintage is explicitly revised and differs from original −7.0% release.

Cause of death / explanatory lens.

No cause of death assigned

The lesson.

How should a baseline forecast communicate vulnerability to shocks outside its central scenario?

Sources.

  1. IMF 2019 Article IV conclusionprimary · 2020-01-29 · claim/date
  2. IMF 2021 Article IV conclusionprimary · 2022-02-10 · revised outcome
  3. January 2020 World Economic Outlookprimary · 2020-01-20 · contemporary counter-signal
  4. Statistics South Africa 2020 performanceprimary · 2021-03-09 · initial outcome and lockdown cause

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