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Money in Real Life · 45 sec

Sunk cost

A practical idea for making clearer everyday money decisions.

  1. The useful idea

    In economics and business decision-making, a sunk cost (also known as retrospective cost) is a cost that has already been incurred and cannot be recovered.

  2. How it works

    Sunk costs are contrasted with prospective costs, which are future costs that may be avoided if action is taken.

  3. Why it matters

    In other words, a sunk cost is a sum paid in the past that should no longer be relevant to decisions about the future.

Use Sunk cost to compare the trade-offs before committing money.

Use Sunk cost to compare the trade-offs before committing money.

Test your recall

Which idea belongs to the explanation of Sunk cost?

  • Why it matters
  • How it works
  • The useful idea — correct

In economics and business decision-making, a sunk cost (also known as retrospective cost) is a cost that has already been incurred and cannot be recovered.

EvergreenLast verified 2026-07-19

General education only — not personal financial advice.

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