How is a relevant market identified by Section 2 of the Sherman Act?

What will be an ideal response?

Identifying the relevant market for a Section 2 action requires defining the relevant product or service market and geographical market. The definition of the relevant market often determines whether the defendant has monopoly power. The relevant product or service market generally includes substitute products or services that are reasonably interchangeable with the defendant's products or services. The relevant geographical market is usually defined as the area in which the defendant and its competitors sell the product or service. This may be a national, regional, state, or local area, depending on the circumstances.