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November 27, 2014 

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QUANTITY DEMANDED: The specific (maximum) quantity of a good or service that buyers are willing and able to buy at a specific demand price. The emphasis here is on specific. Quantity demanded and demand price form a specific pair of numbers.

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MARGINAL UTILITY AND DEMAND:

An explanation of the law of demand and the negatively-sloped demand curve based on utility analysis and the law of diminishing marginal utility. The law of diminishing marginal utility states that marginal utility declines as consumption increases. Because demand price depends on the marginal utility obtained from a good, price also declines as consumption increases, meaning price and quantity demanded are inversely related, which is the law of demand.
Marginal utility and the law of diminishing marginal utility can be used to provide insight into market demand, the law of demand, and the demand curve. This insight rests on two propositions.

  • One, the law of diminishing marginal utility means that the marginal utility obtained from consuming a good declines as the quantity consumed increases.

  • Two, the marginal utility of a good underlies the demand price that buyers are willing and able to pay for a good.

When combined, these two propositions indicate the demand price that buyers are willing and able to pay for a good declines as the quantity demanded (and consumed) increases, which is the law of demand.

Starting with Utility

Edgar Rides the Coaster
Sundae Utility
The graph displayed at the right is Edgar Millbottom's marginal utility curve for riding the Monster Loop Death Plunge roller coaster during a day at the Shady Valley Amusement Park. By transforming this curve ever so slightly, Edgar's demand curve for roller coaster rides can be derived.

But first, consider the marginal utility curve itself.

  • The vertical axis measures marginal utility in utils and the horizontal axis measures quantity in rides on the roller coaster.

  • The marginal utility curve has a negative slope, illustrating the law of diminishing marginal utility.

  • Marginal utility curve intersects the horizontal axis at 6 rides. Marginal utility is positive up to that point, then becomes negative after.
The task at hand is to transform this marginal utility curve into a demand curve. To do this, though, a little more information is needed.

Adjusting the Rule

According to the rule of consumer equilibrium, people like Edgar buy goods such that the marginal utility-price ratio for each good is equal, satisfying this equation:

marginal utility of good 1
price of good 1
=marginal utility of good 2
price of good 2

However, in the derivation of Edgar's demand curve for roller coaster rides, the key comparison is not between roller coaster rides and ONE other good, but with ALL other alternatives. The big assumption, therefore, is that Edgar achieves consumer equilibrium and satisfies this rule of consumer equilibrium for ALL other goods.

If so, then Edgar has a "standard" or "benchmark" marginal utility-price ratio. For the sake of exposition, suppose that Edgar's benchmark marginal utility-price ratio is 2 utils per dollar. In other words, Edgar purchases all sorts of different goods such that the last dollar spent on each good generates 2 utils of satisfaction.

It this case, it is possible to specify the rule of consumer equilibrium as:

marginal utility of roller coaster rides
price of roller coaster rides
=marginal utility of all other goods
price of all other goods
= 2 utils per dollar

If this equation is rearranged just a little, the result is:

marginal utility of roller coaster rides
2 utils per dollar
=price of roller coaster rides

The beauty of this equation is that the price that Edgar is willing and able to pay for roller coaster rides (his demand price) is now connected to the marginal utility derived from those rides.

Making the Conversion

The Conversion
Utility to Demand
In terms of the original marginal utility graph, dividing the marginal utility on the vertical axis by 2 utils per dollar transforms the marginal utility curve into a demand curve. Click the [Demand Curve] button to make this happen.

Not much changes upon clicking the [Demand Curve] button. One change is the measurement units on the vertical axis from utils to dollars. The other change is the elimination of that part of the curve in the negative range of marginal utility and price (negative prices are not relevant). Feel fee to click the [Reset] and [Demand Curve] buttons a couple of times to confirm that not much changes.

Multiple button clicks should serve to emphasize that the marginal utility curve and the demand curve are closely related, that demand is based on marginal utility, and that the law of diminishing marginal utility is the foundation for the law of demand.

<= MARGINAL UTILITYMARGINAL UTILITY CURVE =>


Recommended Citation:

MARGINAL UTILITY AND DEMAND, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2014. [Accessed: November 27, 2014].


Check Out These Related Terms...

     | consumer equilibrium | rule of consumer equilibrium | marginal utility-price ratio | utility maximization | constrained utility maximization |


Or For A Little Background...

     | demand | demand curve | law of demand | demand price | law of diminishing marginal utility | marginal utility | marginal utility curve | price |


And For Further Study...

     | utility measurement | cardinal utility | ordinal utility | util | utilitarianism | total utility curve | diamond-water paradox | utility | total utility | consumer demand theory | utility analysis | income change, utility analysis | price change, utility analysis | preferences change, utility analysis | price elasticity of demand |


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