Perfect Competition:A market structure where there are many small buyers and sellers, the products are homogeneous, and there is free entry and exit. Firms in perfect competition are price takers.
Marginal Revenue: The additional revenue a firm earns from selling one more unit of a good or service. For price takers, marginal revenue is equal to the market price.
Profit Maximization:The goal of a firm to produce the quantity of output that will maximize its profits, given the market price as a price taker.