<< Chapter < Page Chapter >> Page >

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

  • Identify factors that affect demand
  • Graph demand curves and demand shifts
  • Identify factors that affect supply
  • Graph supply curves and supply shifts

The previous module explored how price    affects the quantity demanded and the quantity supplied. The result was the demand curve and the supply curve. Price, however, is not the only thing that influences demand. Nor is it the only thing that influences supply. For example, how is demand for vegetarian food affected if, say, health concerns cause more consumers to avoid eating meat? Or how is the supply of diamonds affected if diamond producers discover several new diamond mines? What are the major factors, in addition to the price, that influence demand or supply?

Visit this website to read a brief note on how marketing strategies can influence supply and demand of products.

What factors affect demand?

We defined demand as the amount of some product a consumer is willing and able to purchase at each price. That suggests at least two factors in addition to price that affect demand. Willingness to purchase suggests a desire, based on what economists call tastes and preferences. If you neither need nor want something, you will not buy it. Ability to purchase suggests that income is important. Professors are usually able to afford better housing and transportation than students, because they have more income. Prices of related goods can affect demand also. If you need a new car, the price of a Honda may affect your demand for a Ford. Finally, the size or composition of the population can affect demand. The more children a family has, the greater their demand for clothing. The more driving-age children a family has, the greater their demand for car insurance, and the less for diapers and baby formula.

These factors matter both for demand by an individual and demand by the market as a whole. Exactly how do these various factors affect demand, and how do we show the effects graphically? To answer those questions, we need the ceteris paribus assumption.

The Ceteris Paribus Assumption

A demand curve    or a supply curve    is a relationship between two, and only two, variables: quantity on the horizontal axis and price on the vertical axis. The assumption behind a demand curve or a supply curve is that no relevant economic factors, other than the product’s price, are changing. Economists call this assumption ceteris paribus    , a Latin phrase meaning “other things being equal.” Any given demand or supply curve is based on the ceteris paribus assumption that all else is held equal. A demand curve or a supply curve is a relationship between two, and only two, variables when all other variables are kept constant. If all else is not held equal, then the laws of supply and demand will not necessarily hold, as the following Clear It Up feature shows.

When does ceteris paribus Apply?

Ceteris paribus is typically applied when we look at how changes in price affect demand or supply, but ceteris paribus can be applied more generally. In the real world, demand and supply depend on more factors than just price. For example, a consumer’s demand depends on income and a producer’s supply depends on the cost of producing the product. How can we analyze the effect on demand or supply if multiple factors are changing at the same time—say price rises and income falls? The answer is that we examine the changes one at a time, assuming the other factors are held constant.

For example, we can say that an increase in the price reduces the amount consumers will buy (assuming income, and anything else that affects demand, is unchanged). Additionally, a decrease in income reduces the amount consumers can afford to buy (assuming price, and anything else that affects demand, is unchanged). This is what the ceteris paribus assumption really means. In this particular case, after we analyze each factor separately, we can combine the results. The amount consumers buy falls for two reasons: first because of the higher price and second because of the lower income.

Questions & Answers

(1).Income is the main determined of macro economics. (a). true (b). false
Manisha Reply
yes
Anjali
tell me correct ans with examples!!
Manisha
yes
The
what yes yes?
Manisha
mam actually I want to say that income is not the main determinant of macro economics.
The
based on your knowledge about the production possibility frontier,demonstrate an assumption of supposed schedule of ppe for the production of rice and face masks by Bangladesh.use graphical representation as well
Ashraf Reply
hay
Ashraf
hlo
Karan
can you answer this
Ashraf
whats tradeoff
JUSTIN Reply
tradeoff is a balance achieved between two desirable but conflicting things
Faith
can I read in Hindi?
Rashmi Reply
don't know..
Azka
why not
Omid
Omid Amini....how?
Rashmi
sure thing
Faith
mention two necessities of estimation of national income in india ?
Krishna Reply
what means the supply
Abdourahamane Reply
hello
mosisa
hii
SHWETA
hi
Aleem
its means amount of product available right now.
Aleem
is everything important here🙂
Alizy
I mean anything*
Alizy
u can read it
Aleem
it's mean something needed or wanted
Alizy
where are from shweta
Aleem
where are you from shweta
Aleem
Hello
Anas
it may mean the stock available
DR
to make something needed or wanted available to someone
Faith
is someone who manufactures something
Faith
What is the cost-benefit analysis?
Hannah Reply
A cost benefit analysis is a process by which organizations can analyze decisions, systems or projects, or determine a value for intangibles. The model is built by identifying the benefits of an action as well as the associated costs and subtracting the costs from benefits.
sanga
thanks!
Hannah
Cost benefit analysis is a process used primarily by businesses that weighs the sum of the benefits, such as financial gain, of an action against the negatives, or costs, of that action.
ALIM
process of cost benefit analysis and decision making crieteria
Santosh
hello everyone
BtsARMY
hello every one,
Dereje
hello everyone
waqar
what is the opportunity cost?
SHWETA
The next best option forgone is call the Opportunity cost of selection one.
Oshadi
who is producer?
rishabh Reply
karan johar
Mohd
shut up mr.mohd
rishabh
it's serious question..
rishabh
shut up mr.mohd
rishabh
simple who produce good
Alizy
who is aconsumer?
Ritik Reply
who uses the commodity
Kanza
a consumer is one that buys good for consumption .
rishabh
Kanza consumers uses the commodity..
rishabh
why do we put tariff on import goods
Salam Reply
Maybe to give national enterprises better opportunities than foreign ones... or just to get more money to the national budget in any way possible. I suppose it allows also to control import and therefore its influence on national economy and other countries economy too.
Pawe
i think to control import or for development of his own industry
RAJPOOTCHANAL
what were the events during the great depression that made classical economy tenets ineffective
Alby Reply
please what is the answer for the following question; derive the expression for a two sector Keynesian model from sowotuom land economy and state all the two components in the expression.
Alby Reply
No idea
ahmad
meaning nature and scope of macroeconomics
Diksha Reply
meaning of macroeconomics
Diksha
meaning of macroeconomics
Diksha
meaning of macroeconomics
Diksha
Macroeconomics covers aggregate or in simple words overall economy of country or world while microeconomics was just concerned with individual economies
Hamza
Hope this helped you, you can search it more on Google there is a YouTube page by the name of jacob Clifford
Hamza
How aggregate demand and output gap are related explain in the light of keynesian cross diagram
Muhammad Reply
what are the jobs of an economist
Shadrach Reply
study and predict economic indicators. give a economic base for polictical decision
mike

Get the best Macroeconomics course in your pocket!





Source:  OpenStax, Macroeconomics. OpenStax CNX. Jun 16, 2014 Download for free at http://legacy.cnx.org/content/col11626/1.10
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Macroeconomics' conversation and receive update notifications?

Ask