Consumer prices · 13 categories · latest 2023-02-01
Source: International Monetary Fund. Data as of 2026-01-01. Collected by Living Inflation Data, HBS Innovations in Economic Measurement (IEM) Lab www.iemlab.org.
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2 recorded findings for this country, shown exactly as in the full quality register.
| Country | Source | Periods | Status | Series | Found | Detected by |
|---|---|---|---|---|---|---|
| Sudan | IMF | 2006-10-01, 1996-12-01, 1997-07-01 | confirmed | SDN.CPI_CP07_*, SDN.CPI_CP08_*, SDN.CPI_CP09_* +1 more | 2026-09-02 | Possible index rebasing |
| Sudan's clearest case is October 2006, where transport and communication step together -- 136.33 -> 101.57 and 135.65 -> 101.07, both -25.5% to the decimal -- and then sit at 100 for a year. Two divisions moving by the identical percentage in the same month, landing on 100, against a declared 2007 base: that is a re-reference of both to the coming base and nothing else fits. Education in July 1997 is a smaller version, 46.46 -> 35.95 and stays at 0.79x. Recreation in December 1996 is not in this class at all -- 5.86 -> 3.43 and back to 5.61 within six months, during the hyperinflation, in a series published to two decimals at levels near 5. Sudan also carries nine isolated bad months (see sdn-cpi-isolated-outlier-months). The step is permanent, confined to one division, and not a revision: these values were published this way. What the data CANNOT settle is whether the division was put on a new base by itself or its prices really fell, because both produce exactly this shape and nothing held here separates them -- the series is verified at 100 in the reference period the source declares, which is true either way. The country's headline index barely moves in the same month, which is suggestive and not conclusive: these are mostly light divisions, so a real fall would leave only a small mark on the aggregate. What IS certain is the consequence, because the source's own rates are this index restated -- the published month-over-month and year-over-year figures equal the index ratios at all 388,805 and 370,534 overlapping cells, checked 2026-09-02. So if the step is a re-reference, the source's own rates divide across it, and the reader has to be told. | ||||||
| Sudan | IMF | 1996-04-01, 1996-07-01, 1996-09-01, 1997-01-01, 1997-11-01, 2001-04-01, 2003-04-01, 2019-02-01 | confirmed | SDN.CPI_CP01_*, SDN.CPI_CP02_*, SDN.CPI_CP05_* +3 more | 2026-09-02 | Single-month index anomaly |
| Nine isolated bad months across eight dates, more than any other country, and the concentration in 1996-97 is not a coincidence: that is Sudan's hyperinflation, when the index doubles inside a year and the published values carry one decimal place at levels around 5, so the data is at its least robust exactly where it moves fastest. The rule used here does not simply ask for a big move -- it requires the months either side to AGREE, which they do in every case here to within 15% while the flagged month sits 20-55% off the midpoint. Examples: furnishings 44.9 -> 21.5 -> 51.6 (Apr 1996), education 38.1 -> 30.0 -> 39.3 (Nov 1997), food 67.1 -> 52.2 -> 69.3 (Apr 2003), communication 975.8 -> 1,423.5 -> 1,043.8 (Feb 2019). | ||||||