Average Revenue (AR)

This is the revenue per unit of the commodity sold.  It is obtained by dividing Total Revenue by total quantity sold.  For a firm in a perfectly competitive market, the AR is the same as price.  Therefore, if price is denoted by P, then we can say:

P = AR

Because of this, the demand curve which relates prices to quantities demanded at those prices is also called Average Revenue Curve.  In economic theory, the demand curve or price line is often referred to as the revenue curve.