The average revenue curve reflects the degree of market control held by a firm. For a perfectly competitive firm with no market control, the average revenue curve is a horizontal line. For firms with market control, especially monopoly, the average revenue curve is negatively-sloped.

Average Revenue Curve, Medicine Style

The average revenue curve for Feet-First Pharmaceutical is displayed in the exhibit to the right. Key to this curve is that Feet-First Pharmaceutical is a monopoly provider of Amblathan-Plus and thus faces a negatively-sloped demand curve. Larger quantities of output are only possible with lower prices.

The vertical axis measures average revenue and the horizontal axis measures the quantity of output (ounces of medicine). Although quantity on this particular graph stops at 12 ounces of medicine, it could go higher.

This curve indicates that if Feet-First Pharmaceutical sells 1 ounce of medicine (at $10 per ounce), then average revenue is $10 per ounce. Alternatively, if it sells 10 ounces (at $5.50 per ounce), then average revenue in is $5.50 per ounce. Should it sell 12 ounces (at $4.50 per ounce), then average revenue is $4.50 per ounce.

For Feet-First Pharmaceutical the average revenue curve is also the demand curve. The curve is negatively sloped, meaning that larger quantities of output result in less average revenue.