- [Instructor] In a previous video,
we've given an intuition
on what foreign exchange markets are all about.
In particular, we talked about the foreign exchange market
between the U.S. dollar and the Chinese yuan.
What we're going to do in this video is think
about the same idea, but think about it in terms of graphs
and the types of economic models that we're used to seeing
in an introductory macroeconomics course.
So what we're going to focus on in this video
is the foreign exchange market.
Foreign exchange
market
for the Chinese
yuan.
Now, we're going to think about it
in terms of supply and demand curves.
It can be a little bit confusing
because we're gonna be thinking of the price of the yuan
in terms of another currency, in this case the dollar,
although you could do it in terms of other currencies,
the pound or the euro or whatever else.
Now, this can be a little bit confusing
because we're going to be thinking
about currency on both axes.
But let's first think about the horizontal axis
that when we're thinking about most markets,
that is our quantity axis.
And here once we're going to think about quantity.
We're gonna think about the quantity.
Quantity of Chinese yuan.
And then our vertical axis,
we're essentially going to be thinking about the price
of the Chinese yuan.
But how do you think about the price of a currency?
Well, we're going to think of it
in terms of another currency.
And for the sake of this video,
that other currency is going to be the U.S. dollar.
So this is going to be U.S. dollars
per Chinese yuan.
And I encourage you, pause this video.
Think deeply about why it's U.S. dollars per Chinese yuan,
as opposed to Chinese yuan per U.S. dollars.
And think about why I put the quantity of Chinese yuan here
instead of the quantity of U.S. dollars,
because this is the foreign exchange market
for the Chinese yuan.
I could have done another chart
where it's the foreign exchange market for the U.S. dollar,
in which case then my quantity would be U.S. dollar.
And then I would think of how much
of some other currency per U.S. dollar.
So I would say maybe how much Chinese yuan per U.S. dollar?
But here it's the other way around.
I'm in the market for the Chinese yuan.
So let's think about the supply and demand curves
and which way they would work.
Well, imagine that people are offering very few U.S. dollars
per Chinese yuan.
Well, in that world, a lot of people might not wanna convert
their yuan into dollars.
They might not offer them up for supply
to be converted into U.S. dollars.
The quantity of Chinese yuan,
if the price for the Chinese yuan is low,
might be pretty low.
And as the price people are willing to pay
in terms of dollars goes up,
well, more and more people might be willing to transact.
So our supply curve, and here we're talking about the supply
for Chinese yuan, is likely to increase
as people are willing to pay more for those yuans.
And this is like many markets that we've seen before.
It's just a little bit less intuitive
because we're thinking about markets for one currency
in terms of another currency.
Now, what about the demand curve?
Well, the demand curve is gonna look
like a lot of demand curves we've seen.
If the price of a Chinese yuan is high,
well, very few people are going to demand it.
And as the price of the Chinese yuan
in terms of dollars is lower and lower,
more and more people might demand more Chinese yuan,
go like, "Hey, it's cheaper now in terms of U.S. dollars."
So this is what a demand curve might look like.
And as you can imagine,
this point is our equilibrium point,
and it would tell us our equilibrium exchange rate.
We could call that our equilibrium exchange rate,
and this would be our equilibrium quantity.
So, for example, let's say that our equilibrium quantity,
and let's say this is the quantity that changes hands
in some time period, so let's say per day.
Let's say or equilibrium quantity is equal to 1,000 yuan.
1,000 yuan.
And let me just call this Q sub one,
is 1,000 yuan.
These numbers are very low.
Real exchange markets, we might be talking about billions
or tens or hundreds of billions
or even sometimes trillions of various currency.
But let's just say for argument it's 1,000 yuan
is our current equilibrium exchange quantity per day.
And let's say this exchange rate, e sub one,
is equal to 10 cents per yuan.
So 10 cents,
or 1/10 of a U.S. dollar per Chinese yuan.
So that's our current exchange rate.
Now, let's say for some reason,
all of a sudden Americans become increasingly interested
in converting their currency.
Maybe they want to invest in China.
Maybe all of a sudden the Chinese say,
"Hey, Americans, come buy property in China."
A lot of people are interested.
Well, what would happen here?
Well, then the demand for yuan would increase
because you could only buy that property in China with yuan,
not with U.S. dollars.
What would happen here?
Well, your demand curve would shift to the right
like we've seen before.
If we call this D one,
then we could get to a new demand curve
that might look something like this, D two.
Now, what would happen
if our equilibrium exchange rate doesn't change?
Well, if this is our exchange rate,
if this were to stay our exchange rate,
now all of a sudden a higher quantity is being demanded
than is being supplied.
The Americans in this situation,
or it actually doesn't even have to be Americans.
It could just be whoever's holding U.S. dollars,
there's demand for more than 1,000 yuan per day.
Maybe this is 1,500 yuan or whatever it might be.
What you would naturally see is that price of the yuan
in terms of U.S. dollars will go up
until you get to an equilibrium point.
And on the first video when we talk about the intuition
of foreign exchange markets,
we talk about why this would be.
So you would then get to a new equilibrium,
right over here, this is e sub two,
and a new equilibrium quantity.
Let's call this Q two.
Our new equilibrium quantity, Q two,
might be 1,200 yuan per day versus 1,000 yuan per day.
And our new equilibrium exchange rate,
maybe this is now equal to 15 cents per yuan
instead of 10 cents per yuan.
So big picture, you can think of the foreign exchange market
in a lot of ways like we've looked
at other markets in macroeconomics.
It takes a little bit of an intuitive leap
to just think about the market for one currency
in terms of another.