Many Firms
There are many firms in each MC product group and many firms on the side lines prepared to enter the market. A product group is a "collection of similar products". The fact that there are "many firms" gives each MC firm the freedom to set prices without engaging in strategic decision making regarding the prices of other firms and each firm's actions have a negligible impact on the market. For example, a firm could cut prices and increase sales without fear that its actions will prompt retaliatory responses from competitors.
How many firms will an MC market structure support at market equilibrium? The answer depends on factors such as fixed costs, economies of scale and the degree of product differentiation. For example, the higher the fixed costs, the fewer firms the market will support. Also the greater the degree of product differentiation - the more the firm can separate itself from the pack - the fewer firms there will be at market equilibrium.
Read more about this topic: Monopolistic Competition
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