Revenue refers to the income that a company receives from its operations, also known as turnover. There are two main approaches for a firm to maximize profit: the total revenue-total cost approach, which involves setting price and quantity where total revenue exceeds total costs; and the marginal revenue-marginal cost approach, where profit is maximized when marginal revenue equals marginal costs. Using these approaches, a firm can determine the most profitable level of output to operate at by producing more when total or marginal revenue exceeds total or marginal costs, and reducing production when costs exceed revenues.