Question

explain the matching concept

Answer 1

The matching concept is an accounting practice whereby firms recognize revenues and their related expenses in the same accounting period. Firms report "revenues," that is, along with the "expenses" that brought them. The purpose of the matching concept is to avoid misstating earnings for a period.
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Answer 2

This concept is based on the accounting period concept.

The most important objective of a business is to ascertain profit periodically.

The determination of profit of a particular accounting period is essentially a process of matching the revenue recognised during the period and the costs to be allocated to the period to obtain the revenue.