Chapter 4.2: Shifts in the Demand Curve

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Presentation transcript:

Chapter 4.2: Shifts in the Demand Curve

Bell ringer Grab a partner On the board, draw a demand curve for oranges Shifts in the Demand Curve intro.

Introduction Why does the demand curve shift? Shifts in the demand curve are caused by outside factors, not just price: Income Consumer Expectations Population Demographics Consumer Tastes and Advertising How could a change in each above cause the demand line to shift?

Changes in Demand In 4.1, we only looked at the change in price, holding all other things constant in the world at that time. Ceteris paribus (kate-er-us. pa-ree-bus) Latin phrase for “all other things held constant” We are assuming nothing else is influencing buyer’s decision other than price.

Changes in Demand A demand schedule (and demand curve) takes into account only changes in price. It does not consider the effects of news reports of any one of the thousands of other factors that change from day to day that could affect the demand for a particular good. A demand curve is accurate only as long as there are no changes other than price that could affect the consumer’s decision – ceteris paribus

Changes in Demand, cont. When we drop the ceteris paribus rule and allow other factors to change, we no longer move along the demand curve. Instead, the entire demand curve shifts. This shift of the entire demand curve is what economists refer to as a change in demand.

Graphing Changes in Demand If the price of a book rose by one dollar, how would you show the change on one of these graphs? If book received horrible reviews, what would happen to the demand curve? If a book received great reviews, what would happen to the demand curve? Movement up the original demand curve Shift in the demand curve to the left Shift in the demand curve to the right

Changes in Demand A consumer’s income affects his or her demand for most goods. As income increases, we demand more normal goods. Ex – shoes, jewelry, CD’s, electronics, food, clothes. Normal goods A good that consumers demand more of when their incomes increase

Changes in Demand Inferior goods A good that consumers demand less of when their incomes increase

Consumer Expectations Checkpoint: How will an anticipated rise in price affect consumer demand for a good? The current demand for a good is positively related to its expected future price. If you expect the price to rise, your current demand will rise, which means you will buy the good sooner. If you expect the price to drop your current demand will fall, and you will wait for the lower price. Checkpoint Answer: It causes the demand for a good to increase.

Population Changes in the size of the population will also affect the demand for most products. Population trends can have a particularly strong effect on certain goods.

Demographics Demographics- are the characteristics of populations, such as age, race, gender, and occupation. How can this change demand? Businesses use this data to classify potential customers. Demographics also have a strong influence on packaging, pricing, and advertising.

Demographics, cont. Hispanics, or Latinos are now the largest minority group in the United States. Firms have responded to this shift by providing products and services for the growing Hispanic population.

Advertising Advertising is a factor that shifts the demand curve because it plays an important role in many trends. How?

Complements and Substitutes The demand curve for one good can also shift in response to a change in demand for another good. There are two types of related goods that interact this way: Complement- are two goods that are bought and used together. Substitute- are goods that are used in place of one another. NOTE TO TEACHERS: The snowboard and boots are two goods that are complements because they are bought and used together.

Review Now that you have learned why the demand curve shifts, go back and answer the Chapter Essential Question. How do we decide what to buy?