Quantity Demanded Refers To The Relationship Between Critical Thinking

By the end of this section, you will be able to:

  • Explain demand, quantity demanded, and the law of demand
  • Identify a demand curve and a supply curve
  • Explain supply, quantity supply, and the law of supply
  • Explain equilibrium, equilibrium price, and equilibrium quantity

First let’s first focus on what economists mean by demand, what they mean by supply, and then how demand and supply interact in a market.

Demand for Goods and Services[edit]

Economists use the term demand to refer to the amount of some good or service consumers are willing and able to purchase at each price. Demand is based on needs and wants—a consumer may be able to differentiate between a need and a want, but from an economist’s perspective they are the same thing. Demand is also based on ability to pay. If you cannot pay for it, you have no effective demand.

What a buyer pays for a unit of the specific good or service is called price. The total number of units purchased at that price is called the quantity demanded. A rise in price of a good or service almost always decreases the quantity demanded of that good or service. Conversely, a fall in price will increase the quantity demanded. When the price of a gallon of gasoline goes up, for example, people look for ways to reduce their consumption by combining several errands, commuting by carpool or mass transit, or taking weekend or vacation trips closer to home. Economists call this inverse relationship between price and quantity demanded the law of demand. The law of demand assumes that all other variables that affect demand (to be explained in the next module) are held constant.

An example from the market for gasoline can be shown in the form of a table or a graph. A table that shows the quantity demanded at each price, such as in the table below, is called a demand schedule. Price in this case is measured in dollars per gallon of gasoline. The quantity demanded is measured in millions of gallons over some time period (for example, per day or per year) and over some geographic area (like a state or a country). A demand curve shows the relationship between price and quantity demanded on a graph like Figure 1, with quantity on the horizontal axis and the price per gallon on the vertical axis. (Note that this is an exception to the normal rule in mathematics that the independent variable (x) goes on the horizontal axis and the dependent variable (y) goes on the vertical. Economics is not math.)

The demand schedule shown by the table and the demand curve shown by the graph are two ways of describing the same relationship between price and quantity demanded.

Price (per gallon)Quantity Demanded (millions of gallons)
$1.00800
$1.20700
$1.40600
$1.60550
$1.80500
$2.00460
$2.20420

Demand curves will appear somewhat different for each product. They may appear relatively steep or flat, or they may be straight or curved. Nearly all demand curves share the fundamental similarity that they slope down from left to right. So demand curves embody the law of demand: As the price increases, the quantity demanded decreases, and conversely, as the price decreases, the quantity demanded increases.

Confused about these different types of demand? Read the next Clear It Up feature.

Is demand the same as quantity demanded?[edit]

In economic terminology, demand is not the same as quantity demanded. When economists talk about demand, they mean the relationship between a range of prices and the quantities demanded at those prices, as illustrated by a demand curve or a demand schedule. When economists talk about quantity demanded, they mean only a certain point on the demand curve, or one quantity on the demand schedule. In short, demand refers to the curve and quantity demanded refers to the (specific) point on the curve.

Supply of Goods and Services[edit]

When economists talk about supply, they mean the amount of some good or service a producer is willing to supply at each price. Price is what the producer receives for selling one unit of a good or service. A rise in price almost always leads to an increase in the quantity supplied of that good or service, while a fall in price will decrease the quantity supplied. When the price of gasoline rises, for example, it encourages profit-seeking firms to take several actions: expand exploration for oil reserves; drill for more oil; invest in more pipelines and oil tankers to bring the oil to plants where it can be refined into gasoline; build new oil refineries; purchase additional pipelines and trucks to ship the gasoline to gas stations; and open more gas stations or keep existing gas stations open longer hours. Economists call this positive relationship between price and quantity supplied—that a higher price leads to a higher quantity supplied and a lower price leads to a lower quantity supplied—the law of supply. The law of supply assumes that all other variables that affect supply (to be explained in the next module) are held constant.

Still unsure about the different types of supply? See the following Clear It Up feature.

Is supply the same as quantity supplied?[edit]

In economic terminology, supply is not the same as quantity supplied. When economists refer to supply, they mean the relationship between a range of prices and the quantities supplied at those prices, a relationship that can be illustrated with a supply curve or a supply schedule. When economists refer to quantity supplied, they mean only a certain point on the supply curve, or one quantity on the supply schedule. In short, supply refers to the curve and quantity supplied refers to the (specific) point on the curve.

Figure 2 illustrates the law of supply, again using the market for gasoline as an example. Like demand, supply can be illustrated using a table or a graph. A supply schedule is a table that shows the quantity supplied at a range of different prices. Again, price is measured in dollars per gallon of gasoline and quantity supplied is measured in millions of gallons. A supply curve is a graphic illustration of the relationship between price, shown on the vertical axis, and quantity, shown on the horizontal axis. The supply schedule and the supply curve are just two different ways of showing the same information. Notice that the horizontal and vertical axes on the graph for the supply curve are the same as for the demand curve.

Price (per gallon)Quantity Supplied (millions of gallons)
$1.00500
$1.20550
$1.40600
$1.60640
$1.80680
$2.00700
$2.20720

The shape of supply curves will vary somewhat according to the product: steeper, flatter, straighter, or curved. Nearly all supply curves, however, share a basic similarity: they slope up from left to right and illustrate the law of supply: as the price rises, say, from $1.00 per gallon to $2.20 per gallon, the quantity supplied increases from 500 gallons to 720 gallons. Conversely, as the price falls, the quantity supplied decreases.

Equilibrium—Where Demand and Supply Intersect[edit]

Because the graphs for demand and supply curves both have price on the vertical axis and quantity on the horizontal axis, the demand curve and supply curve for a particular good or service can appear on the same graph. Together, demand and supply determine the price and the quantity that will be bought and sold in a market.

Figure 3 illustrates the interaction of demand and supply in the market for gasoline. The demand curve (D) is identical to Figure 1. The supply curve (S) is identical to Figure 2. The table below contains the same information in tabular form.

Price (per gallon)Quantity demanded (millions of gallons)Quantity supplied (millions of gallons)
$1.00800500
$1.20700550
$1.40600600
$1.60550640
$1.80500680
$2.00460700
$2.20420720

Remember this: When two lines on a diagram cross, this intersection usually means something. The point where the supply curve (S) and the demand curve (D) cross, designated by point E in Figure 3, is called the equilibrium. The equilibrium price is the only price where the plans of consumers and the plans of producers agree—that is, where the amount of the product consumers want to buy (quantity demanded) is equal to the amount producers want to sell (quantity supplied). This common quantity is called the equilibrium quantity. At any other price, the quantity demanded does not equal the quantity supplied, so the market is not in equilibrium at that price.

In Figure 3, the equilibrium price is $1.40 per gallon of gasoline and the equilibrium quantity is 600 million gallons. If you had only the demand and supply schedules, and not the graph, you could find the equilibrium by looking for the price level on the tables where the quantity demanded and the quantity supplied are equal.

The word “equilibrium” means “balance.” If a market is at its equilibrium price and quantity, then it has no reason to move away from that point. However, if a market is not at equilibrium, then economic pressures arise to move the market toward the equilibrium price and the equilibrium quantity.

Imagine, for example, that the price of a gallon of gasoline was above the equilibrium price—that is, instead of $1.40 per gallon, the price is $1.80 per gallon. This above-equilibrium price is illustrated by the dashed horizontal line at the price of $1.80 in Figure 3. At this higher price, the quantity demanded drops from 600 to 500. This decline in quantity reflects how consumers react to the higher price by finding ways to use less gasoline.

Moreover, at this higher price of $1.80, the quantity of gasoline supplied rises from the 600 to 680, as the higher price makes it more profitable for gasoline producers to expand their output. Now, consider how quantity demanded and quantity supplied are related at this above-equilibrium price. Quantity demanded has fallen to 500 gallons, while quantity supplied has risen to 680 gallons. In fact, at any above-equilibrium price, the quantity supplied exceeds the quantity demanded. We call this an excess supply or a surplus.

With a surplus, gasoline accumulates at gas stations, in tanker trucks, in pipelines, and at oil refineries. This accumulation puts pressure on gasoline sellers. If a surplus remains unsold, those firms involved in making and selling gasoline are not receiving enough cash to pay their workers and to cover their expenses. In this situation, some producers and sellers will want to cut prices, because it is better to sell at a lower price than not to sell at all. Once some sellers start cutting prices, others will follow to avoid losing sales. These price reductions in turn will stimulate a higher quantity demanded. So, if the price is above the equilibrium level, incentives built into the structure of demand and supply will create pressures for the price to fall toward the equilibrium.

Now suppose that the price is below its equilibrium level at $1.20 per gallon, as the dashed horizontal line at this price in Figure 3 shows. At this lower price, the quantity demanded increases from 600 to 700 as drivers take longer trips, spend more minutes warming up the car in the driveway in wintertime, stop sharing rides to work, and buy larger cars that get fewer miles to the gallon. However, the below-equilibrium price reduces gasoline producers’ incentives to produce and sell gasoline, and the quantity supplied falls from 600 to 550.

When the price is below equilibrium, there is excess demand, or a shortage—that is, at the given price the quantity demanded, which has been stimulated by the lower price, now exceeds the quantity supplied, which had been depressed by the lower price. In this situation, eager gasoline buyers mob the gas stations, only to find many stations running short of fuel. Oil companies and gas stations recognize that they have an opportunity to make higher profits by selling what gasoline they have at a higher price. As a result, the price rises toward the equilibrium level. Read Demand, Supply, and Efficiency for more discussion on the importance of the demand and supply model.

Key Concepts and Summary[edit]

A demand schedule is a table that shows the quantity demanded at different prices in the market. A demand curve shows the relationship between quantity demanded and price in a given market on a graph. The law of demand states that a higher price typically leads to a lower quantity demanded.

A supply schedule is a table that shows the quantity supplied at different prices in the market. A supply curve shows the relationship between quantity supplied and price on a graph. The law of supply says that a higher price typically leads to a higher quantity supplied.

The equilibrium price and equilibrium quantity occur where the supply and demand curves cross. The equilibrium occurs where the quantity demanded is equal to the quantity supplied. If the price is below the equilibrium level, then the quantity demanded will exceed the quantity supplied. Excess demand or a shortage will exist. If the price is above the equilibrium level, then the quantity supplied will exceed the quantity demanded. Excess supply or a surplus will exist. In either case, economic pressures will push the price toward the equilibrium level.

Self-Check Question[edit]

Click on a question to see the answer.

  1. Review Figure 3. Suppose the price of gasoline is $1.60 per gallon. Is the quantity demanded higher or lower than at the equilibrium price of $1.40 per gallon? And what about the quantity supplied? Is there a shortage or a surplus in the market? If so, of how much?

    Since $1.60 per gallon is above the equilibrium price, the quantity demanded would be lower at 550 gallons and the quantity supplied would be higher at 640 gallons. (These results are due to the laws of demand and supply, respectively.) The outcome of lower Qd and higher Qs would be a surplus in the gasoline market of 640 – 550 = 90 gallons.

Review Questions[edit]

  1. What determines the level of prices in a market?
  2. What does a downward-sloping demand curve mean about how buyers in a market will react to a higher price?
  3. Will demand curves have the same exact shape in all markets? If not, how will they differ?
  4. Will supply curves have the same shape in all markets? If not, how will they differ?
  5. What is the relationship between quantity demanded and quantity supplied at equilibrium? What is the relationship when there is a shortage? What is the relationship when there is a surplus?
  6. How can you locate the equilibrium point on a demand and supply graph?
  7. If the price is above the equilibrium level, would you predict a surplus or a shortage? If the price is below the equilibrium level, would you predict a surplus or a shortage? Why?
  8. When the price is above the equilibrium, explain how market forces move the market price to equilibrium. Do the same when the price is below the equilibrium.
  9. What is the difference between the demand and the quantity demanded of a product, say milk? Explain in words and show the difference on a graph with a demand curve for milk.
  10. What is the difference between the supply and the quantity supplied of a product, say milk? Explain in words and show the difference on a graph with the supply curve for milk.

Critical Thinking Questions[edit]

  1. Review Figure 3. Suppose the government decided that, since gasoline is a necessity, its price should be legally capped at $1.30 per gallon. What do you anticipate would be the outcome in the gasoline market?
  2. Explain why the following statement is false: “In the goods market, no buyer would be willing to pay more than the equilibrium price.”
  3. Explain why the following statement is false: “In the goods market, no seller would be willing to sell for less than the equilibrium price.”

Problems[edit]

  1. Review Figure 3 again. Suppose the price of gasoline is $1.00. Will the quantity demanded be lower or higher than at the equilibrium price of $1.40 per gallon? Will the quantity supplied be lower or higher? Is there a shortage or a surplus in the market? If so, of how much?

References[edit]

  • Costanza, Robert, and Lisa Wainger. “No Accounting For Nature: How Conventional Economics Distorts the Value of Things.” The Washington Post. September 2, 1990.
  • European Commission: Agriculture and Rural Development. 2013. "Overview of the CAP Reform: 2014-2024." Accessed April 13, 205. http://ec.europa.eu/agriculture/cap-post-2013/.
  • Radford, R. A. “The Economic Organisation of a P.O.W. Camp.” Economica. no. 48 (1945): 189-201. http://www.jstor.org/stable/2550133.

Glossary[edit]

demand curve
a graphic representation of the relationship between price and quantity demanded of a certain good or service, with quantity on the horizontal axis and the price on the vertical axis
demand schedule
a table that shows a range of prices for a certain good or service and the quantity demanded at each price
demand
the relationship between price and the quantity demanded of a certain good or service
equilibrium price
the price where quantity demanded is equal to quantity supplied
equilibrium quantity
the quantity at which quantity demanded and quantity supplied are equal for a certain price level
equilibrium
the situation where quantity demanded is equal to the quantity supplied; the combination of price and quantity where there is no economic pressure from surpluses or shortages that would cause price or quantity to change
excess demand
at the existing price, the quantity demanded exceeds the quantity supplied; also called a shortage
excess supply
at the existing price, quantity supplied exceeds the quantity demanded; also called a surplus
law of demand
the common relationship that a higher price leads to a lower quantity demanded of a certain good or service and a lower price leads to a higher quantity demanded, while all other variables are held constant
law of supply
the common relationship that a higher price leads to a greater quantity supplied and a lower price leads to a lower quantity supplied, while all other variables are held constant
price
what a buyer pays for a unit of the specific good or service
quantity demanded
the total number of units of a good or service consumers are willing to purchase at a given price
quantity supplied
the total number of units of a good or service producers are willing to sell at a given price
shortage
at the existing price, the quantity demanded exceeds the quantity supplied; also called excess demand
supply curve
a line that shows the relationship between price and quantity supplied on a graph, with quantity supplied on the horizontal axis and price on the vertical axis
a table that shows a range of prices for a good or service and the quantity supplied at each price
supply
the relationship between price and the quantity supplied of a certain good or service
surplus
at the existing price, quantity supplied exceeds the quantity demanded; also called excess supply
Figure 1. The demand schedule shows that as price rises, quantity demanded decreases, and vice versa. These points are then graphed, and the line connecting them is the demand curve (D). The downward slope of the demand curve again illustrates the law of demand—the inverse relationship between prices and quantity demanded.
Figure 2. The supply schedule is the table that shows quantity supplied of gasoline at each price. As price rises, quantity supplied also increases, and vice versa. The supply curve (S) is created by graphing the points from the supply schedule and then connecting them. The upward slope of the supply curve illustrates the law of supply—that a higher price leads to a higher quantity supplied, and vice versa.
Figure 3. The demand curve (D) and the supply curve (S) intersect at the equilibrium point E, with a price of $1.40 and a quantity of 600. The equilibrium is the only price where quantity demanded is equal to quantity supplied. At a price above equilibrium like $1.80, quantity supplied exceeds the quantity demanded, so there is excess supply. At a price below equilibrium such as $1.20, quantity demanded exceeds quantity supplied, so there is excess demand.

In microeconomics, the law of demand states that, "conditional on all else being equal, as the price of a good increases (↑), quantity demanded decreases (↓); conversely, as the price of a good decreases (↓), quantity demanded increases (↑)".[1] In other words, the law of demand describes an inverse relationship between price and quantity demanded of a good. Alternatively, other things being constant,quantity demanded of a commodity is inversely related to the price of the commodity. For example, a consumer may demand 2kg of apples at Rs 70 per kg; he may, however, demand 1kg if the price rises to Rs 80 per kg. This has been the general human behaviour on relationship between the price of the commodity and the quantity demanded. The factors held constant refer to other determinants of demand, such as the prices of other goods and the consumer's income.[2] There are, however, some possible exceptions to the law of demand, such as Giffen goods and Veblen goods.

Mathematical expression[edit]

Mathematically, the inverse relationship described by the law of demand may be expressed as:

where is the quantity demanded of good , is the price of the good, is the demand function, is the partial derivative of the demand function with respect to , and is the list of other parameters held constant.[1]

The above equation, when plotted with quantity demanded () on the -axis and price () on the -axis, gives the demand curve, which is also known as the demand schedule. The downward sloping nature of a typical demand curve illustrates the inverse relationship between quantity demanded and price. Therefore, a downward sloping demand curve embeds the law of demand.

Terminology[edit]

Further information: Demand

Note that "demand" and "quantity demanded" are used to mean different things in economic jargon. On the one hand, "demand" refers to the entire demand curve, which is the relationship between quantity demanded and price. Changes in demand are due to changes in other determinants (), such as the income of consumers. Therefore, "change in demand" is used to mean that the relationship between quantity demanded and price has changed. Alfred Marshall worded this as:

When then we say that a person's demand for anything increases, we mean that he will buy more of it than he would before at the same price, and that he will buy as much of it as before at a higher price.[3]

Changes in demand is depicted graphically by a shift in the demand curve.[1] On the other hand, "quantity demanded" refers to the quantity of goods consumers want for a given price, conditional on the other determinants. "Changes in quantity demanded" is depicted graphically by a movement along the demand curve.

Economic history and theory[edit]

The law of demand was documented as early as 1892 by economist Alfred Marshall.[3] Due to the law's general agreement with observation, economists have come to accept the validity of the law under most situations. Furthermore, researchers found that the success of the law of demand extends to animals such as rats, under laboratory settings.[4][5]

Exceptions to the law of demand[edit]

Generally the amount demanded of a good increases with a decrease in price of the good and vice versa. In some cases, however, this may not be true. There are certain goods which do not follow this law. These include Veblen goods and Giffen goods. Further exception and details are given in the sections below.

Giffen goods[edit]

Initially proposed by Sir Robert Giffen, economists disagree on the existence of Giffen goods in the market. A Giffen good describes an inferior good that as the price increases, demand for the product increases. As an example, during the Irish Potato Famine of the 19th century, potatoes were considered a Giffen good. Potatoes were the largest staple in the Irish diet, so as the price rose it had a large impact on income. People responded by cutting out on luxury goods such as meat and vegetables, and instead bought more potatoes. Therefore, as the price of potatoes increased, so did the quantity demanded.[6]

Expectation of change in the price of commodity[edit]

If an increase in the price of a commodity causes households to expect the price of a commodity to increase further, they may start purchasing a greater amount of the commodity even at the presently increased price. Similarly, if the household expects the price of the commodity to decrease, it may postpone its purchases. Thus, some argue that the law of demand is violated in such cases. In this case, the demand curve does not slope down from left to right; instead it presents a backward slope from the top right to down left. This curve is known as an exceptional demand curve.prestigious goods also fail law of demand.

Basic or necessary goods[edit]

The goods which people need no matter how high the price is are basic or necessary goods. Medicines covered by insurance are a good example. An increase or decrease in the price of such a good does not affect its quantity demanded. These goods have a perfectly inelastic relationship, in that any change in price does not change the quantity demanded.

See also[edit]

References[edit]

A demand curve, shown in red and shifting to the right, demonstrating the inverse relationship between price and quantity demanded (the curve slopes downwards from left to right; higher prices reduce the quantity demanded).
An increase in demand is depicted by a rightward shift in the demand curve, from DD0 to DD1. At first, a consumer is willing to consume Q0 units of goods at the price P0, shown by Point A. After their demand for the good increases, for the same quantity demanded Q0, they are now willing to pay at price P1, shown by Point B. For the original price P0, they are now willing consume Q1 units, shown by Point C.
  1. ^ abcNicholson, Walter; Snyder, Christopher (2012). Microeconomic Theory: Basic Principles and Extensions (11 ed.). Mason, OH: South-Western. pp. 27,154. ISBN 978-111-1-52553-8. 
  2. ^http://www.investopedia.com/terms/l/lawofdemand.asp; Investopedia, Retrieved 9 September 2013
  3. ^ abMarshall Abhishek, Alfred (1892). Elements of economics of industry. London: Macmillan. pp. 77,79. 
  4. ^Thaler, Richard. "Toward a positive theory of consumer choice". Journal of Economic Behavior & Organization. 1 (1): 39–60. doi:10.1016/0167-2681(80)90051-7. 
  5. ^Kagel, John H.; Battalio, Raymond C.; Rachlin, Howard; Green, Leonard; Basmann, Robert L.; Klemm, W. R. (1975-03-01). "Experimental Studies of Consumer Demand Behavior Using Laboratory Animals*". Economic Inquiry. 13 (1): 22–38. doi:10.1111/j.1465-7295.1975.tb01101.x. ISSN 1465-7295. 
  6. ^Mankiw, Gregory (2007). Principles of Economics. South-Western Cengage Learning. p. 470. ISBN 978-0-324-22472-6. 

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