Economic profit is the difference between a firm's total revenue and its total economic costs, which include both explicit accounting costs and implicit opportunity costs, such as the normal rate of return on capital. As a fundamental academic concept in microeconomics, it serves as a theoretical construct for analyzing resource allocation efficiency and firm performance by assessing whether returns exceed the full cost of all inputs, including those owned by the firm. Its significance lies in its role as a key indicator driving long-run entry and exit decisions in competitive markets and signaling the optimal allocation of resources across alternative uses.