A cost incurred in the past that is not relevant to any current decision is classified as a(n): Sunk costs
This is further explained below.
Generally, A cost that has already been incurred but cannot be recouped is referred to as a "sunk cost" in economics and the process of making business decisions. In contrast to sunk costs, prospective costs are future expenses that might be avoided if action is done, while sunk costs have already been incurred.
In conclusion, A cost that was incurred in the past but is not relevant to any choice that is being made at this time is considered to be a(n): Incurred expenses
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