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Cognitive biases, with an everyday example of eachA list of cognitive biases from Scroll's lessons, each with an everyday example, the study behind it and a quiz. Anchoring, sunk cost, halo effect and more.
Stoicism for beginnersStoicism for beginners: the dichotomy of control, memento mori and Stoic virtue in one-minute lessons with quizzes, from Seneca, Epictetus and Marcus Aurelius.

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Psychology40s read

The Sunk Cost Fallacy

You stay in a bad movie because you paid for the ticket. You keep a failing project alive because you invested years. The money or time is gone regardless. It is a sunk cost. Rational decisions look forward, not backward. But our brains hate "wasting" past investments, even when continuing wastes more.

Source Arkes, H.R., & Blumer, C. (1985). The psychology of sunk cost.

Quick quiz

You have invested two years in a project that is clearly failing. The rational decision is to:

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