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argument_from_sunk_cost
The argument from sunk cost urges continuing a course of action primarily because of the irrecoverable resources already invested in it, rather than based on the future costs and benefits of continuing versus stopping. This scheme is closely related to the argument from waste but focuses specifically on the psychological difficulty of writing off past investments. It is almost always fallacious from a rational decision-making perspective, since sunk costs should be irrelevant to forward-looking decisions.
I have already spent four years and $200,000 on this law degree. Even though I have realized I hate the legal profession, I should finish the degree and practice law for at least a few years. Otherwise, all that time and money will have been for nothing.
Our team has been developing this software feature for eight months and spent 600 developer-hours on it. Even though user research now shows customers don't want it, we should ship it anyway so all that work isn't wasted.
I've been in this relationship for six years, so even though we've grown apart and are both unhappy, it makes no sense to break up now. Leaving would mean all that time together meant nothing.
Binary (yes/no) questions an LLM must answer to identify this aspect:
Is past investment being cited as a reason to continue a course of action?
Type: binaryWould the decision be the same if no prior investment had been made?
Type: binaryAre future costs and benefits being properly evaluated independent of sunk costs?
Type: binaryIs emotional attachment to the investment influencing the reasoning?
Type: binaryThe argument from sunk cost urges continuing a course of action primarily because of the irrecoverable resources already invested in it, rather than based on the future costs and benefits of continuing versus stopping. This scheme is closely related to the argument from waste but focuses specifically on the psychological difficulty of writing off past investments. It is almost always fallacious from a rational decision-making perspective, since sunk costs should be irrelevant to forward-looking decisions.
Loss aversion makes the prospect of 'losing' past investments deeply painful. Continuing feels like protecting those investments, while stopping feels like destroying them, even though the past costs are gone regardless.
Apply the 'fresh start' test: if you were starting from scratch today with no prior investment, would you choose this path? Only future costs and benefits should matter. The money and time are already spent whether you continue or not.
Sunk cost arguments drive continued investment in failing military campaigns, struggling business ventures, unhappy relationships, and government infrastructure projects that have exceeded their budgets.
Use these tools to detect, analyze, or train this aspect.