This is a Lexicon entry: the mechanism, when it shows up, and the countermeasure. The full correction, with real-world cases and the audit prompt, hasn't been written yet.
Definition
The belief that the past was inherently better than the present or future.
When it shows up
When evaluating whether the present is better or worse than the past; in historical and political debates. In expert witness testimony: when a specialist forgets what they did not know at the time of an event. In code documentation: when a developer cannot reconstruct the reasoning behind their own decisions three months later.
Failure mode
Genuine progress denied. Policy built on a false belief that things are getting worse. Misallocated resources based on nostalgic misperception of the past.
Countermeasure
Check historical data rather than relying on memory or cultural narrative. Ask: "Is this actually worse or does it just feel that way?" Distinguish mood from measurement.
Related traps
Also connected in the map6 more, locked
Credit & first seen
DiscoveredStudied as a cognitive and cultural phenomenon; related to Rosy Retrospection and the Tocqueville Paradox.
Also revealed
Entry #120 of 631 in The Lexicon · see the full Lexicon