Which of the following is not an accounting concept?

The accounting concepts are the basic assumptions or principles that guide the recording, presentation, and interpretation of financial transactions and statements. They are universally accepted and practiced in accounting to ensure accuracy, relevance, and comparability of financial information. Out of the given options, all are accounting concepts except for 'historical cost'. Historical cost is a convention in accounting that requires an asset or liability to be recorded at its original cost at the time of acquisition. It is a method of valuing assets and liabilities that does not necessarily reflect their current market value. While it is a widely used and accepted method, it is not technically a concept, but rather a convention or principle applied in accounting.