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Why Subtracting a Negative Equivalent to Adding a Positive

  • 0:00 - 0:05
    This is Steve and this is Steve's uncle
    and Steve is in a bit of a bind.
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    Not only does he not have any money
    but he also owes Michael,
  • 0:10 - 0:11
    who is not depicted here.
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    He owes Michael $3. So he actually
    has a negative net worth.
  • 0:16 - 0:19
    Steve has a net worth of -3.
  • 0:19 - 0:24
    Steve's uncle cares about Steve
    and feels bad that he doesn't even have
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    a 0 net worth;
    he has a negative net worth!
  • 0:26 - 0:29
    And so Steve's uncle wants to at least
    take away some of this pain.
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    He at least wants to get Steve back
    to a neutral net worth, a 0 net worth.
  • 0:35 - 0:43
    So he decides to take away
    Steve's negative net worth.
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    He wants to take away that -3.
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    What happens if you take away that -3?
    Well, that should get you back to 0.
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    If you take away anything...
    if you have something
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    and you take it away,
    it should go back to 0.
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    Similarly if you owe people things
    and that owing people things
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    is taken away, it also gets back to 0.
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    And another way to think about it is
    how Steve's uncle would actually
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    take that liability,
    take that debt away from Steve.
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    Well, the easiest way he could do it
    if Steve is starting at -3 net worth
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    is for his uncle to give Steve $3,
    so that he(Steve) can get back
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    to a net worth of 0.
  • 1:25 - 1:28
    So hopefully, that makes it
    a little bit clearer,
  • 1:28 - 1:32
    that this and this
    are intuitively equivalent.
Title:
Why Subtracting a Negative Equivalent to Adding a Positive
Description:

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Video Language:
English
Duration:
01:33

English subtitles

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