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The basic assumptions imply that a perfectly competitive firm must accept market conditions. A perfectly competitive firm must accept equilibrium prices prevailing in the market due to the pressure of competing firms. It cannot influence price in order to earn a profit because all firms produce homogeneous products and buyers know the market price.

The four basic assumptions of perfect competition are

• Firms produce homogeneous products: products are identical in shape, size, and quality. Thus, they are a perfect substitute for each other.
• Many buyers are available to buy products and sellers to sell the product: a large number of consumers willing and able to buy the product at a given price, and a large number of sellers willing and able to supply product at a certain price.
• Sellers and buyers have all relevant information about the product: all consumers and producers have perfect knowledge of price and quality.
• Firms can enter or leave the market without any restrictions: no entry and exit barriers make it easy to move in or out of the market.