Final answer:
In a purely competitive market, the price per unit to a buyer is equal to the average revenue to a seller, as the market determines the price and sellers are price-takers with perfectly elastic demand for their products.
Step-by-step explanation:
In a purely competitive market, the price per unit to a buyer is equal to the average revenue to a seller. This occurs because a perfectly competitive firm must accept the market price for its product, which means it can sell any number of units at this price. Therefore, the price per unit (which is also the marginal revenue) is constant regardless of the quantity sold, and it equals the average revenue.
Total revenue for a seller in a purely competitive market is calculated by multiplying the quantity of goods sold by the market price. It is important to distinguish this from total profits, which factor in costs. Also, average profits would consider the margin above average costs, not just revenues.