IT System Auditor
33683 Points
Joined April 2010
A sunk cost is a payment that can't be recovered; it's already been done and its not refundable. They're irrelevant in making decisions about future actions for that reason; whether you want to or not, you can't reverse that cost.
For example, when a car is purchased, it can subsequently be resold; however, it will probably not be resold for the original purchase price.
regards,