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Escalation of commitment vs sunk cost fallacy: catch the spiral early

The sunk cost fallacy is the reasoning error; escalation of commitment is the behavioural spiral it feeds — each new investment makes the next exit harder.

Why it works

These two terms get used interchangeably and are not the same thing. The sunk cost fallacy is a reasoning error at the level of a single judgment: you let unrecoverable past costs influence a forward-looking decision, when rational choice says only future costs and benefits should count. Escalation of commitment, the phenomenon Barry Staw documented starting in 1976, is the behavioural pattern that plays out over time and largely in organisations: a decision-maker who is personally responsible for a failing course of action commits further resources to it, in successive rounds, more than an uninvolved decision-maker looking at the same facts would. The practical distinctions matter. Sunk cost is one bias among several drivers of escalation; Staw’s experiments isolated personal responsibility as a separate force, because self-justification — the need to prove the original decision was sound — is doing work that pure cost-accounting confusion does not explain. Escalation is also social where sunk cost is largely cognitive: public visibility, reputational exposure, and the cost of admitting error to others all intensify it. And escalation is dynamic — each additional investment becomes its own sunk cost, so the trap deepens with every round, which is why recognising the pattern early is substantially easier than stopping later. In short: sunk cost explains why leaving feels wasteful; escalation explains why you keep paying to stay.

How to do it

  1. Periodically review ongoing projects and commitments with the question: "Am I investing more to justify prior investment?"
  2. Track successive investment levels: if each round is larger than the last without proportional expected return improvement, that is an escalation signal.
  3. Name the pattern explicitly to yourself: "I am escalating this commitment."
  4. Seek outside evaluation at the first escalation signal rather than waiting for crisis.

Evidence

Escalation of commitment is a well-documented organizational and individual phenomenon, particularly when decision-makers are personally responsible for the initial commitment. Staw (1976, 1981) provides the foundational experimental and organizational research. (observational)

Escalation effects are strongest when personal responsibility and social visibility are high; individual private decisions show smaller effects.

Sources

Common mistake

Noticing the escalation pattern only in retrospect — after each successive investment was too small to seem alarming on its own but added up to a large total.

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Frequently asked questions

What is Escalation of commitment vs sunk cost fallacy: catch the spiral early?

These two terms get used interchangeably and are not the same thing. The sunk cost fallacy is a reasoning error at the level of a single judgment: you let unrecoverable past costs influence a forward-looking decision, when rational choice says only future costs and benefits should count. Escalation of commitment, the phenomenon Barry Staw documented starting in 1976, is the behavioural pattern that plays out over time and largely in organisations: a decision-maker who is personally responsible for a failing course of action commits further resources to it, in successive rounds, more than an uninvolved decision-maker looking at the same facts would. The practical distinctions matter. Sunk cost is one bias among several drivers of escalation; Staw’s experiments isolated personal responsibility as a separate force, because self-justification — the need to prove the original decision was sound — is doing work that pure cost-accounting confusion does not explain. Escalation is also social where sunk cost is largely cognitive: public visibility, reputational exposure, and the cost of admitting error to others all intensify it. And escalation is dynamic — each additional investment becomes its own sunk cost, so the trap deepens with every round, which is why recognising the pattern early is substantially easier than stopping later. In short: sunk cost explains why leaving feels wasteful; escalation explains why you keep paying to stay.

What is the most common mistake with Escalation of commitment vs sunk cost fallacy: catch the spiral early?

Noticing the escalation pattern only in retrospect — after each successive investment was too small to seem alarming on its own but added up to a large total.