The Demand Curve Shifts
-
Not Synced[Tyler] In our previous videos,
-
Not Syncedwe covered the basics
of the demand curve. -
Not SyncedNow we get to dive into
what happens -
Not Syncedwhen the demand curve shifts
-
Not Synceddue to increases or decreases
in market demand. -
Not SyncedRemember that a demand curve
is a function -
Not Syncedwhich shows the quantity demanded
at different prices. -
Not SyncedAnd the quantity demanded
is the quantity -
Not Syncedthat buyers are willing
and able to purchase -
Not Syncedat a particular price.
-
Not SyncedWe said last time
that an increase in demand -
Not Syncedmeans a shifting out
of the demand curve, -
Not Synceda movement toward the northeast
away from the origin. -
Not SyncedNow let's look at that more closely.
-
Not SyncedAn increase in demand means
there's a greater quantity demanded -
Not Syncedat every price.
-
Not SyncedFor example,
-
Not Syncedon the old demand curve
at a price of $25, -
Not Syncedpeople were willing
and able to purchase 70 units. -
Not SyncedOn the new demand curve
at that same price of $25, -
Not Syncedpeople are now willing
and able to purchase 80 units. -
Not SyncedAn increase in demand
is a greater quantity demanded -
Not Syncedat the same price.
-
Not SyncedWe can also read
an increase in demand -
Not Syncedusing the vertical method.
-
Not SyncedWhat that means is that
in every quantity -
Not Syncedthere is a greater willingness
to pay for that quantity. -
Not SyncedFor example, for the 70th unit,
-
Not Syncedpeople were willing to pay $25
for that unit. -
Not SyncedNow with the new demand curve,
-
Not Syncedpeople are willing to pay $50
for that unit. -
Not SyncedThat's a greater willingness to pay
for the same quantity -
Not Syncedand this is what
an increase in demand means. -
Not SyncedTo review
because this is important: -
Not Syncedan increase in demand
means an increase -
Not Syncedin the quantity demanded
at every price, -
Not Syncedor equivalently it means
an increase -
Not Syncedin the maximum willingness to pay
for a given quantity. -
Not SyncedWhat would cause an increase
in demand? -
Not SyncedThe answer is anything that increases
the quantity demanded -
Not Syncedat a given price
-
Not Syncedor that which increases
the maximum willingness to pay -
Not Syncedfor a given quantity.
-
Not SyncedFor instance, can you think
of some factors -
Not Syncedwhich would make consumers
willing to pay more for a good? -
Not SyncedCan you think of a factor
which would make consumers want -
Not Synceda greater quantity at a fixed price?
-
Not SyncedThose are the types of factors
-
Not Syncedwhich are going to shift
the demand curve. -
Not SyncedNow in a minute
I'm going to give you a list -
Not Syncedof such possible factors
-
Not Syncedbut I don't want you to memorize
this list. -
Not SyncedInstead, I want you to understand
what an increase in demand means. -
Not SyncedIf you understand that,
-
Not Syncedthen you'll always be able
to recreate such a list on the fly. -
Not SyncedNow, here are some examples
of important demand shifters. -
Not SyncedFor instance, changes in income
and changes in population. -
Not SyncedCan you see through our example
how an increase in income -
Not Syncedmight cause people
to be willing to pay more -
Not Syncedfor a given quantity of a good,
-
Not Syncedor might cause them to want more
of that good at a particular price? -
Not SyncedHow about changes in population?
-
Not SyncedMore people might increase
the quantity demanded -
Not Syncedat a particular price
-
Not Syncedbecause there are more
potential customers. -
Not SyncedFewer people in the world
could decrease -
Not Syncedthe quantity demanded.
-
Not SyncedHow about some other factors
which might shift demand curves? -
Not SyncedWell, there are prices of substitutes,
prices of complements, -
Not Syncedexpectations, and changes in taste.
-
Not SyncedThese are all a little bit trickier
-
Not Syncedbut I'll go through them all
in a moment. -
Not SyncedI just wanted for now to give you
a sense of some of the other things -
Not Syncedwhich might also shift market demand.
-
Not SyncedOf course, everything I've said about
an increase in demand -
Not Syncedapplies just the same, but in reverse
for a decrease in demand. -
Not SyncedA decrease in demand
is a shift inwards of the curve -
Not Syncedtoward the origin.
-
Not SyncedIt again could be read in two ways.
-
Not SyncedIt means that in any given price
-
Not Syncedthere is less quantity demanded
at that price. -
Not SyncedSimilarly, for any given quantity
-
Not Syncedthere is a lower willingness to pay
for the same quantity. -
Not SyncedA decrease in demand means
a decrease in the quantity demanded -
Not Syncedat every given price
or equivalently, a decrease -
Not Syncedin the maximum willingness
to pay for each given quantity. -
Not SyncedWhat might cause a decrease
in demand? -
Not SyncedAgain, I'm going to belabor
this point a little bit, -
Not Syncedbut a decrease in demand
is anything -
Not Syncedthat decreases
the quantity demanded -
Not Syncedat a given price
-
Not Syncedor that decreases
the maximum willingness to pay -
Not Syncedfor a given quantity.
-
Not SyncedIf you keep in mind
-
Not Syncedthat is what a decrease
in demand means -
Not Syncedthen you'll always be able
to come up with factors, -
Not Syncedwhich would decrease
market demand. -
Not SyncedLet's look in more detail
at some of the demand shifters -
Not Syncedbeginning with income.
-
Not SyncedThe effect of changes income
on demand -
Not Synceddepends on the nature
of the good in question. -
Not SyncedFor more goods,
when your income goes up, -
Not Syncedyou demand more of that good.
-
Not SyncedImagine that you're a poor student
right now but soon you'll graduate -
Not Syncedand get a high paying job.
-
Not SyncedWhen you get that high-paying job,
when your income goes up, -
Not Syncedyou're probably going to demand
more automobiles, -
Not Syncedmore housing, and more fine dining.
-
Not SyncedThese are all called Normal Goods
-
Not Syncedbecause the demand for them
goes up when incomes go up. -
Not SyncedAnd of course the demand for them
goes down when incomes go down. -
Not SyncedThere are also goods however,
for which when your income goes up -
Not Syncedyour demand for them actually
goes down. -
Not SyncedAgain, when I was a poor student
for instance, -
Not SyncedI actually sometimes went
to McDonald's -
Not Syncedto buy a cheeseburger
because it was cheap. -
Not SyncedWhen my income went up later,
I ate at McDonald's less often -
Not Syncedand ate at better restaurants,
which of course cost more. -
Not SyncedI haven't actually eaten
at McDonald's for many years. -
Not SyncedAn inferior good is one which
when your income goes up -
Not Syncedthe demand for it goes down
and vice versa. -
Not SyncedFor instance, think about soup.
-
Not SyncedSoup is a cheap and easy meal.
-
Not SyncedSo during a recession,
-
Not Syncedthe demand for soup
may well go up. -
Not SyncedDuring boom times,
-
Not Syncedthe demand for soup
may well go down. -
Not SyncedNow, let's test your knowledge.
-
Not SyncedI suggest you get a pencil
and also a piece of paper. -
Not SyncedPut down two demand curves.
-
Not SyncedNow we're going to think about
the demand for hamburger helper -
Not Syncedand we're going to think about it
in two different situations, -
Not Syncednamely, during a boom
and during a recession. -
Not SyncedHere's our demand
for hamburger helper. -
Not SyncedWhat is going to happen
to this demand -
Not Syncedwhen the economy goes into a boom?
-
Not SyncedWhen people's incomes go up?
-
Not SyncedNow draw the new demand curve.
-
Not SyncedWhat's that new demand curve
going to look like? -
Not SyncedIn a boom, the demand
for hamburger helper -
Not Syncedis going to decrease
-
Not Syncedbecause hamburger helper
is an inferior good -
Not Syncedso we get a decrease in demand.
-
Not SyncedWhat about in a recession?
-
Not SyncedOf course in a recession,
we get the opposite. -
Not SyncedIn a recession,
when incomes are going down -
Not Syncedthe demand for hamburger helper
is going up. -
Not SyncedHere's another demand shifter,
namely population. -
Not SyncedAs the population
of an economy changes, -
Not Syncedthe number of potential buyers
of a particular good also changes. -
Not SyncedFor instance, what happens
to the demand for diapers in Russia -
Not Syncedas birth rates drop?
-
Not SyncedWell, that demand is going to decrease.
-
Not SyncedIn the United States,
as you probably know, -
Not Syncedthe baby boomers are getting older,
-
Not Syncedso we're having many more
elderly individuals -
Not Syncedin the population.
-
Not SyncedWhich products
will increase in demand -
Not Syncedas the American population gets older?
-
Not SyncedWell, think about that for a moment.
-
Not SyncedHere are a few possible examples.
-
Not SyncedAs the number of elderly
in the United States goes up, -
Not Syncedwe would expect an increase
in the demand -
Not Syncedfor cancer drugs, for instance.
-
Not SyncedIndeed as the population
has gotten older, -
Not Syncedpharmaceutical firms
have invested more -
Not Syncedin research and development
for producing drugs -
Not Syncedfor elder people.
-
Not SyncedWe expect also as people get older,
-
Not Syncedthe demand
for retirement communities goes up, -
Not Syncedperhaps even the demand for golf.
-
Not SyncedHow would we do this
on the demand curve? -
Not SyncedWell, use an old demand curve
-
Not Syncedbut as the population gets older
-
Not Syncedthe demand for these products -
cancer drugs, -
Not Syncedretirement communities
and golf equipment, -
Not Syncedwell that goes up,
-
Not Syncedso this curve shifts away
from the origin -
Not Syncedand up to the right.
-
Not SyncedHere's another demand shifter -
the price of substitutes. -
Not SyncedTwo goods are substitutes
-
Not Syncedif an increase in the price
of one good -
Not Syncedleads to an increase in demand
for the other good as well. -
Not SyncedFor example, suppose that the price
of Nike shoes goes up. -
Not SyncedWell, that is going to increase
the demand for Reebok shoes -
Not Syncedand vice versa.
-
Not SyncedSuppose instead that the price
of Nike shoes goes down, -
Not Syncedthat is going to decrease the demand
for Reeboks -
Not Syncedas people switch from Reeboks
to the now cheaper good, Nike. -
Not SyncedAnother example.
-
Not SyncedWhat happens to the demand
for iTunes if songs on Spotify, -
Not Synceda competitor, become cheaper?
-
Not SyncedIf Spotify is cheaper,
-
Not Syncedthat's going to decrease the demand
for iTunes. -
Not SyncedAnother important demand shifter
is the price of complements. -
Not SyncedComplements are goods
which tend to go together well. -
Not SyncedThink for instance if hotdogs and hotdog
buns. Technically, two goods are -
Not Syncedcomplements if an increase in the price of
one of those goods leads to a decrease in -
Not Syncedthe demand for the other. Suppose for
instance that the price of hotdogs goes -
Not Syncedup, that means fewer people are going to
buy hotdogs. That means that demand for -
Not Syncedhotdog buns is going to decrease as well
and vice versa of course. Again if the -
Not Syncedprice of hotdog buns goes down, people are
going to want to buy more buns. But then -
Not Syncedthey're also going to want to buy more of
the complement of hotdogs. So the demand -
Not Syncedfor hotdogs will go up when the price of
the complement hotdog buns goes down. -
Not SyncedHere's another example. What happens to
the demand for sport utility vehicles when -
Not Syncedgasoline gets more expensive? Cars in
gasoline or sport utility vehicles on -
Not Syncedgasoline, they're complements. When you
want one, you also want the other. So if -
Not Syncedgasoline gets more expensive, that is
going to decrease the demand for sport -
Not Syncedutility vehicles. Another important demand
shifter is expectations. -
Not SyncedIt can be expectations of events or of
prices. In particular, if people expect -
Not Syncedthe price of a good to be higher in the
future, that is going to tend to increase -
Not Synceddemand today. Consumers will adjust their
current spending in anticipation of what -
Not Syncedis going to happen to future prices in
order to obtain the lowest possible price -
Not Syncedby buying more today. For example, imagine
you hear there's going to be a hurricane. -
Not SyncedIf the hurricane hits you expect the price
of batteries is going to go way up or -
Not Syncedperhaps it's going to be very difficult to
even get any batteries at all. That's -
Not Syncedgoing to increase the demand for batteries
today. Something in the future, that is -
Not Syncedthis expectation of a future event can
change the demand today. Similarly, if -
Not Syncedpeople expect that the price of the Xbox
360 is going to drop right before -
Not SyncedChristmas, well then sales in November
will go down. Apple has to deal with this -
Not Syncedproblem all of the time. Each time people
expect a new iPhone model, they stop -
Not Syncedbuying the current version of the iPhone.
So Apple doesn't want anyone to know when -
Not Synceda new iPhone is going to be coming out
because otherwise in the mean time, the -
Not Syncedsales of the current product will drop.
Taste is an important demand shifter and -
Not Syncedtastes change all the time. Tastes differ
among consumers and they also differ -
Not Syncedovertime because of seasonal changes or
fashion or fads. For instance, what -
Not Syncedhappens to the demand for boots in
October? What happens to the demand for -
Not Syncedswimsuits in June? What happens to the
demand for sunscreen during the summer? -
Not SyncedWhat happens when everyone things that the
Atkins diet is going to cause them to lose -
Not Syncedweight? Let's take a closer look at that
one. The Atkins diet if you recall was a -
Not Synceddiet which said that carbohydrates make
you fat so the way to lose weight was to -
Not Syncedconsume more protein, more red meat in
particular. What do you think was the -
Not Syncedeffect of the Atkins diet on the demand
for red meat? -
Not SyncedIt increased that demand. What about the
effect of the diet on the demand for -
Not Syncedbread? It decreased the demand for bread.
By the way, Atkins later had a heart -
Not Syncedattack and after he had this heart attack,
the demand for the Atkins diet went down -
Not Syncedso these two factors went into reverse.
The final point for this lecture is a -
Not Syncedterminological one and this will become
more clear after we've covered more of -
Not Syncedsupply. I'll come back to that but for now
I just want to give you a heads up. -
Not SyncedUnfortunately, economists sometimes use
similar words for different concepts. In -
Not Syncedparticular, a change in the quantity
demanded is not the same as a change in -
Not Synceddemand. A change in the quantity demanded
is about a movement along a fixed demand -
Not Syncedcurve due to a change in price. For
instance, as you recall, we can say that -
Not Syncedat a price of $10, the quantity demanded
is 200. When the price changes and we move -
Not Syncedalong this curve, so then when the price
falls to $5 we see that the quantity -
Not Synceddemanded is 450 units. That's a change in
quantity demanded. It's a movement along -
Not Syncedthis fixed curve as we just saw. A change
in demand is a non-price induced change. -
Not SyncedIt's a shift of the entire demand curve. A
change in demand such as an increase in -
Not Synceddemand is again a shift in this curve. So
keep these two differences in mind. Change -
Not Syncedin quantity demanded is a movement along a
curve due to changes in price. A change in -
Not Synceddemand is a shift of the entire demand
curve due to changes in income or -
Not Syncedpopulation or taste or any of the other
factors other than price that we've talked -
Not Syncedabout. Anyway, those are the points for
now on demand curves. Thanks. -
Not Synced- If you want to test yourself,
click Practice Questions or if you're -
Not Syncedready to move on, just click Next Video.
- Title:
- The Demand Curve Shifts
- Description:
-
{'type': u'plain'}
- Video Language:
- English
- Team:
- Marginal Revolution University
- Project:
- Micro
- Duration:
- 14:00
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts | ||
Melanie Ty edited English subtitles for The Demand Curve Shifts |