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November 27, 2022 

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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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CONSTRAINED UTILITY MAXIMIZATION:

The process of obtaining the highest possible level of utility from the consumption of goods or services, under given restrictions, when the highest overall level of utility cannot be reached. The notion of constrained utility maximization is a modification of the more general utility maximization assumption. It is based on the recognition that consumers might be restricted from achieving the absolute maximum level of utility. The primary restrictions tend to be the amount of income available relative to price paid. Constrained utility maximization generally does reach the peak of the total utility curve.
While the generic notion of utility maximization as the unrestricted pursuit of utility is important to the study of economics and consumer demand theory, everyday life is primarily guided by the notion of constrained utility maximization. People seldom maximize utility outright. They must do the best they can under assorted constraints and restrictions.

Utility Analysis

Roller Coaster Utility
Total Utility
The accompanying table can be used to illustrate constrained utility maximization. The numbers indicate the total utility obtained by Edgar Millbottom while riding the Monster Loop Death Plunge roller coaster at the Shady Valley Amusement Park. The right-hand column indicates the accumulated satisfaction Edgar receives from riding the Monster Loop Death Plunge roller coaster 8 times during his day at the amusement park.

While unrestricted utility maximization would see Edgar ride the roller coaster 6 times and receive 36 utils of satisfaction, assorted constraints might prevent him from doing so.

Consider a few examples:

  • Maybe the lines are so long that he can squeeze in ONLY 4 rides during his day at the amusement park.

  • Maybe several of his closest friends lock him in one of the restroom stalls for several hours, thus preventing him from even reaching the roller coaster.

  • Maybe an earthquake shakes the Monster Loop Death Plunge roller coaster into a pile of splintered rumble after his second ride.

  • Or more relevant to the study of demand, maybe the amusement park charges a $1 per ride and Edgar has only $4 dollars to spend.
For the last example, the best that Edgar can do is 4 trips around the coaster track. His constrained utility maximization is only at 32 utils rather than 36 utils. Income and prices inevitably impose constraints on the utility generated from consumption.

Indifference Curve Analysis

Two Goods
Indifference Curves
Constrained utility maximization can be incorporated quite easily in standard utility analysis. However, it is even more important to indifference curve analysis.

The standard diagram used for indifference curve analysis is presented in the exhibit to the right. The indifference curve, labeled U, presents all combinations of two goods that provide the same amount of utility. The income or budget constraint, labeled I, shows the alternative combinations of the two goods that the buyer can purchase given a specific amount of income and existing prices.

In this analysis, the consumer maximizes utility by reaching the indifference curve corresponding to the highest possible level of utility, given the existence of the budget constraint. This is achieved at a point of tangency, that is, where the budget constraint just touches the indifference curve a single point.

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Recommended Citation:

CONSTRAINED UTILITY MAXIMIZATION, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2022. [Accessed: November 27, 2022].


Check Out These Related Terms...

     | consumer equilibrium | rule of consumer equilibrium | marginal utility and demand | marginal utility-price ratio |


Or For A Little Background...

     | utility maximization | utility | total utility | consumer demand theory | utility analysis |


And For Further Study...

     | law of diminishing marginal utility | utility measurement | cardinal utility | ordinal utility | util | utilitarianism | marginal utility | marginal utility curve | total utility curve | diamond-water paradox | income change, utility analysis | price change, utility analysis | preferences change, utility analysis |


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