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 evolved belief that accomplishing a specific goal will result in lasting happiness, when in reality, happiness is a moving horizon.
When it shows up
After achieving a major goal; when anticipating the happiness an achievement will bring; when 'when I get X, then I will be happy' thinking is active.
Failure mode
Making poor long-term decisions based on overestimated future wellbeing. Pursuing achievements, relationships or acquisitions whose emotional payoff evaporates on arrival.
Countermeasure
Ask people who have already achieved what you are pursuing how they actually feel now. Their reports are far more accurate than your predictions. Expect happiness to be milder and shorter than forecast.
Related traps
Also connected in the map14 more, locked
Credit & first seen
DiscoveredKorb, S.&Bhogal, G. (cited). Ben-Shahar, T. (2009). Even Happier. McGraw-Hill source ↗
Also revealed
Entry #85 of 631 in The Lexicon · see the full Lexicon