must each perfectly competitive firm be in equilibrium if the industry is in the long-run equilibrium? why?

Microeconomics
13th Edition
ISBN:9781337617406
Author:Roger A. Arnold
Publisher:Roger A. Arnold
Chapter9: Perfect Competition
Section9.3: Perfect Competition In The Long Run
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must each perfectly competitive firm be in equilibrium if the industry is in the long-run equilibrium? why?

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Perfect competition refers to the situation where there are large number of prouder and consumers are exists in the market. Producers are selling homogenous goods in the market. Individual firms or consumers cannot influence the market supply of demand. Firms and consumers are price takers. The equilibrium price and quantity is determined by the equilibrium between market demand and supply.

 In the perfect competition, firms are producing output at the point where the demand and supply intersects each other.  In the perfect competition marginal cost (MC) curve is the supply curve. Also demand curve, average revenue (AR) cure and marginal revenue curve (MR) curve coincide with each other.

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