The accrual concept that costs incurred to generate a revenue are expensed in the same period the revenue is recognized is known as the matching principle.
The matching principle is one of the Generally Accepted Accounting Principles (GAAP). It is a principle that states that costs should be recognised in the same period as when the revenue is earned.
For example, if a producer sells $1000 worth of apples in January, the cost attached to producing the apples should be recognised also in January. This is the matching principle.
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