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March 12, 2026 

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ACTUAL INVESTMENT: Investment expenditures that the business sector actual undertakes during a given time period, including both planned investment and any unplanned inventory changes. This is a critical component of Keynesian economics and the analysis of macroeconomic equilibrium, which occurs when actual investment is equal to planned investment. The difference between planned and actual investment is unplanned investment, which is inventory changes caused by a difference between aggregate expenditures and aggregate output. Should actual and planned investment differ, then aggregate expenditures are not equal to aggregate output, and the macroeconomy is not in equilibrium.

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TOTAL REVENUE CURVE, MONOPOLISTIC COMPETITION:

A curve that graphically represents the relation between the total revenue received by a monopolistically competitive firm for selling its output and the quantity of output sold. It is combined with the total cost curve to determine economic profit and the profit maximizing level of production. The slope of the total revenue curve is marginal revenue.
Monopolistic competition is a market structure with a large number of relatively small firms that sell similar but not identical products. Each firm is small relative to the overall size of the market such that it has some market control, but not much. In other words, it can sell a wide range of output at a narrow range of prices. This translates into a relatively elastic demand curve. If a monopolistically competitive firm wants to sell a larger quantity, then it must lower the price.

The total revenue curve reflects the degree of market control held by a firm. For a perfectly competitive firm with no market control, the total revenue curve is a straight line. For firms with more market control, such as monopolistic competition, the slope of the total revenue curve flattens at larger quantities. The slope of this total revenue curve is marginal revenue.

Total Revenue Curve,
Sandwich Style
Total Revenue Curve, Monopolistic Competition
The total revenue curve for Manny Mustard's House of Sandwich is displayed in the exhibit to the right. Key to this curve is that Manny Mustard is a monopolistically competitive provider of Deluxe Club Sandwiches and thus faces a negatively-sloped demand curve. Larger quantities of output are only possible with lower prices.

The vertical axis measures total revenue and the horizontal axis measures the quantity of output (number of sandwiches). Although quantity on this particular graph stops at 10 sandwiches of medicine, it could go higher.

This curve indicates that if Manny Mustard's House of Sandwich sells 1 sandwich (at $5.25 per sandwich), then it receives $5.25 of total revenue. Alternatively, if it sells 10 sandwiches (at $4.75 per sandwich), then it receives $47.50 of total revenue.

While the curvature is slight, the total revenue curve for monopolistic competition is not a straight line. While the curvature is slight, the total revenue curve for monopolistic competition is not a straight line. For Manny Mustard the total revenue curve has a slightly flatter slope as more output is produced. The changing slope of this curve is due to the changing price.

<= TOTAL REVENUE CURVETOTAL REVENUE CURVE, MONOPOLY =>


Recommended Citation:

TOTAL REVENUE CURVE, MONOPOLISTIC COMPETITION, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: March 12, 2026].


Check Out These Related Terms...

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


Or For A Little Background...

     | market structures | monopolistic competition | monopolistic competition, characteristics | monopolistic competition, demand | demand | demand price | law of demand | efficiency |


And For Further Study...

     | short-run production analysis | monopolistic competition, short-run production analysis | monopolistic competition, long-run production analysis | monopolistic competition, efficiency | monopolistic competition, profit maximization | monopolistic competition, loss minimization | monopolistic competition, shutdown |


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