According to the International Valuation Standards (IVS), fair value is defined as "the price at which an asset or liability could be exchanged in a transaction between market participants at the measurement date, under conditions that are assumed to be normal, that is, not affected by the sale."

In other words, it is the amount that a willing buyer would pay to a willing seller for an asset or liability, with both parties being fully informed and without any pressure to act.

Fair value refers to the price that an asset or liability would fetch in the open market, under normal circumstances. It is an objective measure of value that takes into account the characteristics of the asset or liability, as well as the market conditions and trends at the time of valuation.

The concept of fair value is important in financial reporting because it provides a basis for determining the value of assets and liabilities that are recorded on a company's balance sheet. In particular, fair value is often used as the basis for measuring the value of investments, such as stocks and bonds, as well as intangible assets, such as patents and trademarks.

IVS also specifies that fair value should be based on the most reliable and relevant information available, and that it should be determined using appropriate valuation techniques. In addition, IVS requires that valuers be independent and objective in their assessments, and that they disclose any assumptions or estimates that they have made in determining fair value.

 In the IVS, fair value is further broken down into three categories:

There are three approaches to measuring fair value: the market approach, the income approach, and the cost approach.

Overall, the concept of fair value is an important consideration in financial reporting, as it provides a basis for determining the value of assets and liabilities in a way that reflects the expectations of market participants. By using fair value as the basis for valuation, companies can provide more accurate and transparent information about their financial position and performance to stakeholders. The concept of fair value is central to the practice of valuation, and it is an important concept for professionals working in the field to understand and apply.