The sunk cost effect in subscriptions you no longer use

Why "I've already paid six months for this" is the strongest predictor of paying a seventh.

The sunk cost effect was first formalized in consumer-behavior research by Arkes & Blumer (1985). Their Organizational Behavior and Human Decision Processes paper ran a series of controlled experiments in which subjects who had paid more for an option were more likely to continue using or attending it — even when an objectively better alternative was available for free.

Arkes & Blumer's stated finding: "Once an investment of money, effort, or time has been made, individuals exhibit a tendency to continue the endeavor… even though objective evidence suggests that abandoning it would be more beneficial." — Arkes, H. R., & Blumer, C. (1985). "The Psychology of Sunk Cost." Organizational Behavior and Human Decision Processes, 35(1), 124–140.

The effect is closely linked to Thaler's earlier theoretical work in the Journal of Economic Behavior & Organization, which framed sunk-cost behavior as a violation of standard economic theory but a robust feature of real human decision-making.

Thaler: "The pure economic theory of consumer choice presents a normative theory of how rational consumers should choose, but it is a poor descriptive account of how real consumers actually do choose." — Thaler, R. (1980). "Toward a Positive Theory of Consumer Choice." Journal of Economic Behavior & Organization, 1(1), 39–60.

Subscriptions are a near-optimal trigger. Past payments accumulate visibly on a card statement. Cancellation feels like admitting the past spending was wasted. The forward-looking question — "would I start paying for this today?" — is the one most people don't ask, because it bypasses the sunk-cost framing.

The Arkes & Blumer literature is consistent on the intervention: explicitly reframe the decision as forward-looking. "Would a stranger pay $14 a month for what I'm using?" reliably overrides the sunk-cost bias in experimental work.

References

• Arkes, H. R., & Blumer, C. (1985). Org. Behav. Hum. Decis. Process., 35(1), 124–140.
• Thaler, R. (1980). J. Econ. Behav. Organ., 1(1), 39–60.

Related: Endowment effect · Loss aversion · Subscription fatigue