The demand for a good links the amount of a good that people
would buy to the price of the good. There is an inverse relationship
between the price and the quantity demanded of a product. In part
one of this section we will try to understand what is behind the
demand curve, and in part two we will address the concept of elasticity.
Click on each of the following
topics to read the notes
A.
Consumer Behavior
In this section we will try to understand what is behind the
demand curve —why people buy more of a good when its price
declines and vice-versa. We will become familiar with some assumptions
that conventional economists make about our behavior and our motivations.
We will explore how consumers allocate their budget and how they
determine the mix of goods and services that they wish to have
and can afford. In the process we also will raise some questions
about the validity of the conventional assumptions of the consumer
behavior model.
Consumer behavior http://www.usadata.com/
Consumer behavior http://sorrel.humboldt.edu/~campbell/p309.htm
B.
Elasticity of Demand
Elasticity measures how consumers change the quantities of different
products that they purchase in response to changes in the price
of different products, changes in the consumers' income, or changes
in the price of other products. We will explain why when the price
of gasoline increases, consumers barely cut their consumption
of gasoline; and why an increase in international air fare may
cause a more than proportionate decline in international tourism.
Cigaretts is a product that is often used to illustrate how elasticity
can be used to analyze consumers' behavior and also determine
government policies. The addictive nature of smoking amounts to
a relatively inelastic demand for cigaretts. In the United States
a 10% increase in price of cigaretts lowers its consumption by
only 3% (price elasticity of demand is 0.3). This means that a
large tax increase on cigaretts would be required if government
wants to curtail smoking. Imperical studies also suggest that
smoking and drinking beer are complementary. A tax on beer that
causes a 10% price increase would lower cigarette smoking by 2%,
i.e., the cross elasticity of demand for cigaretts is about -0.2.
Helpful Internet Sites:
Data and information related to smoking http://www.globalink.org/
Measures to reduce demand for tobacco http://www.globalink.org/tobacco/wb/wb04.shtml
Smoking related data for US http://www.globalink.org/tccp/USA.pdf
Information and data on US tobacco http://tobaccofreekids.org
Information and news about tobacco in Canada
http://www.nsra-adnf.ca