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Mortgage-Backed Securities I

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    Welcome to my presentation on
    mortgage-backed securities.
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    Let's get started.
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    And this is going to be part
    of a whole new series of
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    presentations, because I think
    what's happening right now in
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    the credit markets is pretty
    significant from, I guess, a
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    personal finance point of
    view and just from a
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    historic point of view.
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    And I want to do a whole set
    of videos just so people
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    understand, I guess, how
    everything fits together, and
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    what the possible repercussions
    could be.
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    But we have to start
    with the basics.
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    So what is a mortgage-backed
    security?
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    You've probably read
    a lot about these.
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    So historically, let's think
    about what historically
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    happens when I went to get a
    loan for a house, let's say,
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    20 years ago.
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    And I'm going to simplify
    some things.
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    And later we can do
    a more nuanced.
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    Where'd my pen go?
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    Let's say I need $100,000.
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    No, let me say $1 million,
    because that's actually closer
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    to how much houses cost now.
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    Let's say I need a $1 million
    loan to buy a house, right?
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    This is going to be a mortgage
    that's going to be
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    backed by my house.
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    And when I say backed by my
    house, or secured by my house,
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    that means that I'm going to
    borrow $1 million from a bank,
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    and if I can't pay back
    the loan, then the
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    bank gets my house.
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    That's all it means.
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    And oftentimes it'll only be
    secured by the house, which
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    means that I could just give
    them back the keys.
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    They get the house and I have
    no other responsibility, but
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    of course my credit
    gets messed up.
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    But I need a $1 million loan.
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    The traditional way I got a $1
    million loan is I would go and
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    talk to the bank.
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    This is the bank.
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    They have the money.
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    And then they would give me $1
    million and I would pay them
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    some type of interest. I'll
    make up a number.
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    The interest rates obviously
    change, and we'll do future
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    presentations on what causes the
    interest rates to change.
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    But let's say I would pay them
    10% interest. And for the sake
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    of simplicity, I'm going to
    assume that the loans in this
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    presentation are interest-only
    loans.
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    In a traditional mortgage, you
    actually, your payment has
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    some part interest and
    some part principal.
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    Principal is actually when
    you're paying down the loan.
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    The math is a little bit more
    difficult with that, so what
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    we're going to do in this case
    is assume that I only pay the
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    interest portion, and at the
    end of the loan I pay the
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    whole loan amount.
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    So let's say that this
    is a 10-year loan.
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    So for each year of the 10
    years, I'm going to pay
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    $100,000 in interest. $100,000
    per year, right?
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    And then in year 10, I'm going
    to pay the $100,000 and I'm
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    also going to pay back
    the $1 million.
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    Right?
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    Year 1, 2, 3, dot, dot,
    dot, dot, 9, 10.
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    So in year one, I
    pay $100,000.
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    Year two, I pay $100,000.
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    Year three, I pay $100,000.
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    Dot, dot, dot, dot.
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    Year nine, I pay $100,000.
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    And then year 10, I pay the
    $100,000 plus I pay back the
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    $1 million.
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    So I pay back $1.1 million.
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    So that's kind of how the cash
    is going to be transferred
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    between me and the bank.
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    And this is how a-- I don't
    want to say a traditional
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    loan, because this isn't
    a traditional loan, an
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    interest-only loan-- but for the
    sake of this presentation,
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    how it's different than a
    mortgage-backed security, the
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    important thing to realize
    is that the bank would
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    have kept the loan.
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    These payments I would have been
    making would have been
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    directly to the bank.
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    And that's what the
    business that,
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    historically, banks were in.
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    Another person, you-- and you
    have a hat-- let's say you're
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    extremely wealthy and
    you would put $1
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    million into the bank.
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    Right?
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    That's just your life savings
    or you inherited
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    it from your uncle.
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    And the bank would pay you,
    I don't know, 5%.
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    And then take that $1 million,
    give it to me, and get 10% on
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    what I just borrowed.
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    And then the bank makes
    the difference, right?
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    It's paying you 5% percent and
    then it's getting 10% from me.
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    And we can go later into how
    they can pull this off, like
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    what happens when you have
    to withdraw the money,
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    et cetera, et cetera.
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    But the important thing to
    realize is that these payments
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    I make are to the bank.
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    That's how loans worked before
    the mortgage-backed security
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    industry really got developed.
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    Now let's do the example with
    a mortgage-backed security.
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    Now there's still me.
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    I still exist. And I still
    need $1 million.
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    Let's say I still
    go to the bank.
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    Let's say I go to the bank.
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    The bank is still there.
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    And like before, the bank
    gives me $1 million.
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    And then I give the
    bank 10% per year.
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    Right?
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    So it looks very similar
    to our old model.
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    But in the old model,
    the bank would keep
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    these payments itself.
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    And that $1 million it had is
    now used to pay for my house.
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    Then there was an innovation.
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    Instead of having to get more
    deposits in order to keep
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    giving out loans, the bank said,
    well, why don't I sell
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    these loans to a third
    party and let them do
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    something with it?
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    And I know that that might
    be a little confusing.
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    How do you sell a loan?
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    Well let's say there's me.
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    And let's say there's
    a thousand of me.
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    Right?
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    There's a bunch of Sals
    in the world.
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    Right?
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    And we each are borrowing
    money from the bank.
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    So there's a thousand of me.
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    Right?
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    I'm just saying any kind
    of large number.
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    It doesn't have to
    be a thousand.
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    And collectively we
    have borrowed a
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    thousand times a million.
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    So we've collectively borrowed
    $1 billion from the bank.
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    And we are collectively paying
    10% on that, right?
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    Because each of us are going to
    pay 10% per year, so we're
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    each going to pay 10%
    on that $1 billion.
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    Right?
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    So 10% on that $1 billion is
    $100 million in interest. So
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    this 10% equals $100 million.
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    Now the bank says, OK, all the
    $1 billion that I had in my
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    vaults, or whatever-- I guess
    now there's no physical money,
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    but in my databases-- is now
    out in people's pockets.
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    I want to get more money.
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    So what the bank does is it
    takes all these loans
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    together, that $1 billion in
    loans, and it says, hey,
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    investment bank-- so that's
    another bank-- why don't you
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    give me $1 billion?
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    So the investment bank gives
    them $1 billion.
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    And then instead of me and the
    other thousands of me paying
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    the money to this bank, we're
    now paying it to this new
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    party, right?
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    I'm making my picture
    very confusing.
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    So what just happened?
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    When this bank sold the loans--
    grouped all of the
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    loans together and it folded it
    into a big, kind of did it
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    on a wholesale basis--
    it's sold a thousand
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    loans to this bank.
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    So this bank paid $1 billion
    for the right to get the
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    interest and principal payment
    on those loans.
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    So all that happened is, this
    guy got the cash and then this
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    bank will now get the
    set of payments.
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    So you might wonder, why
    did this bank do it?
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    Well I kind of glazed over the
    details, but he probably got a
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    lot of fees for doing this, or
    maybe he just likes giving
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    loans to his customers,
    whatever.
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    But the actual right answer
    is that he got
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    fees for doing this.
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    And he's actually probably going
    to transfer a little bit
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    less value to this guy.
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    Now, hopefully you understand
    the notion of actually
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    transferring the loan.
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    This guy pays money and now the
    payments are essentially
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    going to be funnelled to him.
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    I only have two minutes left
    in this presentation, so in
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    the next presentation I'm going
    to focus on what this
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    guy can now do with the
    loan to turn it into a
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    mortgage-backed security.
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    And this guy's an investment
    bank instead of
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    a commercial bank.
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    That detail is not that
    important in understanding
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    what a mortgage-backed security
    is, but that will
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    have to wait until the
    next presentation.
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    See you soon.
Title:
Mortgage-Backed Securities I
Description:

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Video Language:
English
Team:
Khan Academy
Duration:
07:57

English subtitles

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