Concorde fallacy; sunk cost fallacy
A cognitive bias where people continue investing in a failing project because they have already invested resources, named after the Concorde supersonic aircraft project.
Due to the Concorde fallacy, people sometimes pour more money into a project that is clearly failing.
From English 'Concorde effect' or 'Concorde fallacy', named after the Anglo-French supersonic airliner project that continued despite its lack of economic viability.