Answer :
Sunk cost are always irrelevant when making current decisions.
Sunk cost is the cost that has already been incurred and cannot be recovered. Sunk cost should not be considered when making future economic decisions.
An example of sunk cost: A farmer buys a piece of land for $100,000. He plants on the land. Years later, the land becomes infertile. The farmer is considering selling the land. In this question, the cost of the land is sunk cost. The sunk cost is $100,000. The farmer should not consider this cost when determining if to sell the land or not.
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