September 29, 2020 

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GINI INDEX: One of the most common measures of income or wealth distributions. It indicates how equal, or unequal, income, wealth, or similar stuff is distributed among the population. If you happen to come across a Gini index, you'll see that it falls in the range of 0 to 1. A value of 0 tells you that the distribution is perfectly equal, that is, everyone has exactly the same amount of income, wealth, or whatever. A value of 1, however, tells you that the distribution is what we could call perfectly unequal, that is, one person has everything and everyone else has nothing.

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The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. For a perfectly competitive firm average revenue is also equal to marginal revenue. Average revenue for a perfectly competitive firm is often depicted by a horizontal average revenue curve.
Average revenue is the revenue generated per unit of output sold. It plays a role in the determination of a perfectly competitive firm's profit. Per unit profit is average revenue minus average (total) cost. A perfectly competitive firm generally seeks to produce the quantity of output that maximizes profit.

The relation between average revenue and quantity of output produced depends on market structure. For a perfectly competitive firm, average revenue is not only equal to price, but more importantly, it is equal to marginal revenue, all of which are constant. For a monopoly, monopolistically competitive, or oligopoly firm, average revenue is greater than marginal revenue, both of which decrease with larger quantities of output. The constant or decreasing nature of average revenue is a prime indication of the market control of a firm.

Average revenue can be represented in a table or as a curve. For a perfectly competitive firm, the average revenue curve is a horizontal, or perfectly elastic, line. The average revenue curve is also the demand curve facing the firm.

The average revenue received by a firm is total revenue divided by quantity, often expressed as this simple equation:

average revenue=total revenue

At times, it can be helpful to turn this equation around and calculate total revenue from average revenue:

total revenue=average revenuexquantity
Perfect competition is a market structure with a large number of small firms, each selling identical goods. Perfectly competitive firms have perfect knowledge and perfect mobility into and out of the market. These conditions mean perfectly competitive firms are price takers, they have no market control and receive the going market price for all output sold.

Average Revenue,
Zucchini Style
Average Revenue, Perfect Competition
The table to the right summarizes the average revenue received by a hypothetical firm, Phil the zucchini grower, for selling zucchinis in a perfectly competitive zucchini market. The first column is the quantity of zucchinis sold, ranging from 0 to 10 pounds. The second column is then the price Phil receives for selling his zucchinis, which is $4 per pound. The third column is the total revenue Phil receives for producing and selling alternative quantities of zucchinis.

Average revenue in the forth column is found by dividing total revenue in the third column by quantity in the first column. For example, because the total revenue generated from the production of 5 pounds of zucchinis is $20, average revenue is $4 (= $20/5). Each value in the fourth column is calculated in the same way.

The obvious point is that average revenue is equal to $4 for each and every pound of zucchinis sold. The reason is that price is constant at $4 for each and every pound of zucchinis sold. Average revenue is price. Price is average revenue. The two are one and the same.

Average Revenue Curve,
Zucchini Style
Average Revenue Curve, Perfect Competition
Average revenue is commonly represented by an average revenue curve, such as the one displayed in the exhibit to the right. This particular average revenue curve is that for zucchini sales by Phil the zucchini grower, a presumed perfectly competitive firm.

The vertical axis measures average revenue and the horizontal axis measures the quantity of output (pounds of zucchinis). Although quantity on this particular graph stops at 10 pounds of zucchinis, the nature of perfect competition indicates it could easily go higher.

This curve indicates that if Phil sells 1 pound of zucchinis, then his revenue per unit is $4. However, if he sells 10 pounds, then he also receives $4 of average revenue. Should he sell 100 pounds, then he moves well beyond the graph, but his average revenue remains at $4.

The average revenue curve is actually the demand curve for Phil's zucchinis. In fact, in the same way that average revenue is just another term for price, the average revenue curve is just another term for demand curve.


Recommended Citation:

AVERAGE REVENUE, PERFECT COMPETITION, AmosWEB Encyclonomic WEB*pedia,, AmosWEB LLC, 2000-2020. [Accessed: September 29, 2020].

Check Out These Related Terms...

     | average revenue | average revenue curve, perfect competition | average revenue, monopoly | average revenue, monopolistic competition | total revenue, perfect competition | marginal revenue, perfect competition | average cost | average product |

Or For A Little Background...

     | market structures | perfect competition | perfect competition, characteristics | perfect competition, demand | monopoly | oligopoly | monopolistic competition | demand | demand price | law of demand |

And For Further Study...

     | short-run production analysis | short-run analysis, perfect competition | long-run analysis, perfect competition | perfect competition, efficiency | perfect competition, breakeven output | perfect competition, profit analysis | short-run production alternatives, perfect competition | perfect competition, profit maximization |

Related Websites (Will Open in New Window)...

     | U.S. Chamber of Commerce | Better Business Bureau | Small Business Administration |

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