Hyperinflation
Money losing value so fast that prices are reset within a single day and savings in the national currency simply disappear.
How to read the number
Almost always the consequence of financing a budget deficit by issuance: trust in the money goes, its velocity rises, and that accelerates prices further.
When the metric lies
It does not fade gradually — it ends with a change of regime: a new currency, a peg to a foreign one, or a fiscal reform. History offers no smooth return to normal.
Also known as: hyperinflationary spiral