The demand curve facing a firm in a perfectly competitive market is represented by a horizontal line at a 0.70 equilibrium price.
A perfectly competitive market is one in which the number of buyers and sellers is very large, all engaged in buying and selling a homogeneous product without any artificial restrictions and possessing perfect knowledge of market at a time.
In a perfectly competitive market, a firm cannot change the price of a product by modifying the quantity of its output.
In a perfectly competitive market, the price of a product is determined by the forces of market demand and market supply and the price is set at such a level that the quantity demanded is equal to the quantity supplied. In terms of the demand and supply curves, this occurs where the market demand and the market supply curves intersect.
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