A perfect competitor is a hypothetical market structure where no individual participant can influence the market price of a product. Therefore, the market price (P) is equal to the marginal revenue (MR) and average revenue (AR) of the product. So, the correct statement is "P = AR = MR." This means that the price that a seller receives for a unit of their product (P) is equal to both the total revenue received (AR) and the additional revenue gained from selling one more unit (MR).