沉没成本困局 / Sunk Cost Entrapment

Definition

Sunk cost entrapment is the pattern in which prior investment of money, time, status, intimacy, identity, or hope makes continued commitment feel preferable to exit even though the past cost cannot be recovered by the present decision.

Current Synthesis

Hanji 556 defines the extractive relationship version through 废后许氏 and 淳于长. Isolation and hope make repeated payments to a false restoration channel harder to stop because exit would force recognition that earlier spending and humiliation produced nothing.

The 《笑傲江湖》 source extends the mechanism to identity-protective loyalty. 岳灵珊’s teaching, defense, marriage, hope, and public life choice make disconfirming evidence threaten her account of herself as well as the relationship.

EP95 adds trading loss chasing. An unrealized or realized loss does not create a claim on future market gains, but the goal of “earning it back” can turn new labor income, borrowed funds, or a moved stop into fresh exposure.

The vol.58 career case makes the corrective rule operational beyond obvious loss. A successful fifteen-year career can still become sunk-cost pressure if the person uses the next decade to prove the earlier choice was correct. The decision should convert attention from past worth to the cost and value of continuing from today, while defining stopping conditions before identity and emotion are strongest. Across all four domains, the mechanism is strongest when exit threatens hope, self-judgment, status, or the meaning of prior sacrifice.

Key Claims

• Past cost is irreversible and should not by itself determine the next commitment.
• Few alternative channels and weak verification can make false future promises unusually powerful.
• Sunk cost can defend identity and life narrative as well as money or status.
• Loss chasing creates a new risk; it does not logically reverse the prior loss.
• Power imbalance, coercion, incomplete information, and unsafe exit can coexist with sunk-cost pressure.
• Stop-loss judgment evaluates present prospects and future downside rather than vindicating past investment.
• Precommitted stopping conditions can protect a later decision from escalation driven by identity, emotion, or the need to prove consistency.

Evidence

Extractive promise under isolation

• Hanji 556 says Empress Xu repeatedly gives Chunyu Zhang valuables while waiting for a restoration promise the host treats as empty.

Identity-protective relationship investment

• 006 闲话金庸《笑傲江湖》｜令狐冲到底爱谁？ interprets Yue Lingshan’s continued defense of Lin Pingzhi through care, marriage, sympathy, incomplete knowledge, and the cost of admitting that a life-defining choice may have failed.

Trading loss chasing

• EP95 treats the need to win back a family loss, reinvest labor income, or move a stop as ways past loss can create new market exposure.

Successful-path continuation

• vol.58 says an established career can have been correct and valuable without obligating the next fifteen years, and redirects the decision toward future cost, future value, and preset exit conditions.

Counterevidence & Qualifications

Delayed exit is not automatically irrational. A person may face danger, incomplete information, genuine attachment, illiquidity, transaction cost, family responsibility, retraining cost, or a still-positive forward prospect. Empress Xu’s exact motives remain source-scoped; Yue Lingshan’s knowledge and available exits remain disputed; a losing trade may sometimes recover for reasons independent of the prior loss; and a mature career may still offer the best forward value. Sunk cost is an interpretive mechanism, not a clinical diagnosis or proof that every continued commitment is mistaken.

What Changed

• Extended the concept from visibly losing commitments to successful paths that become identity obligations.
• Added the rule of comparing future cost and value rather than asking the future to justify the past.
• Added precommitted stopping conditions as protection against later escalation.

Related Concepts

• Trading Outcome Bias / 交易结果偏误 - lucky recovery can falsely validate continued commitment.
• Stop-Loss Discipline - evaluates the forward risk after a thesis or rule fails.
• Behavioral Investing Biases - broader investing context for loss aversion and confirmation seeking.
• 精神虐待识别 - relationship context for empty promises and resource extraction.
• Structural Power Imbalance / 结构性权力不平衡 - condition that can make exit materially unsafe.
• Relational Self-Concept Selection / 亲密关系选择与自我概念 - explains why leaving can threaten identity as well as attachment.
• 向前看的退出决策 / Forward-Looking Exit Decision - applies the forward-cost rule to career and life transitions.