Sunk Cost Fallacy
Also called: sunk costs, escalation of commitment, throwing good money after bad
The sunk cost fallacy is letting unrecoverable past spending justify further commitment. Rationally, only future costs and benefits matter — what's spent is gone whatever you decide next. It keeps investors in failing positions, companies in failing projects and founders in failing products, and the phrase that signals it is 'we've already put so much into this'.
Where this is taught
Definitions are the trailer. These free levels turn Sunk Cost Fallacy into something you play — one bite-size lesson, with worked examples, a quiz and XP.