Sunkcost refers to the cost that has been paid and cannot be recovered. Sunk cost is determined by the past decision or environment, and the cost caused by it cannot be changed by any decision now or in the future.
According to the above definition, which of the followings does not involve sunkcost?
Xiao Li spent $100 on a second-hand desktop computer. When he returned home, he had to reluctantly discard the computer because he couldn't carry it