It is the portion of a competitive firm's marginal cost curve that lies above he minimum possible point of its AVC curve. Therefore, the MC curve gives the relationship between price and quantity supplied by the competitive firm.
At a price P1> AVC quantity supplied is Q1. At a higher price P2 quantity is Q2.
To induce a profit maximization firm to supply more output, market price should rise. When the market price increases, MR would exceed MC at a current output. Therefore, the firm finds it profitable to increase quantity supplied at the new higher price and as a result increases MC to the point at which it equals that price.
The determinants of market supply.
- The number of firms in the industry
- The average size of firms in the industry measured by quantity of fixed inputs employed (for example average of factories for production capacity).
- The price of variable inputs used by firms in the industry.
- The technology employed in the industry
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