Approval voting


(male narrator)
So…we’re…now
we’re gonna look at a different type
of voting. Uh…this is called,
uh…”approval voting,” and this takes
a totally different approach than…than the voting
we did earlier. With approval voting, we don’t cast
a ranked choice of voting where we, you know,
we rank our choices in order. Instead, in approval voting,
each person votes… what they’re okay with. In other words,
what they’re willing to approve. Uh…so for example,
uh…three…a group of friends trying to decide
which movie they watch. Uh…you know,
Ann here is saying, I’m okay with watching
Titanic or the Matrix. Either one’s fine. Uh…and Marv here
doesn’t care. He’s willing
to watch anything. Eve would really only… only really wants
to watch the Matrix. She doesn’t wanna watch any
of the other ones. And so approval voting,
uh…is very simple, ’cause we just total up how many
approvals each choice gets. So in this case, Titanic
gets a total of 5 approvals, uh…Scream gets a total
of 1, 2, 3, 4, 5, 6 approvals. Uh…and the Matrix,
uh…has a total of 7 approvals, and so Matrix is the winner,
uh…under approval voting here. Now you
might be wondering what could possible be wrong
with-with approval voting? Uh…and let’s look
at a case here. So here, we have
a traditional voting preference. And-and suppose that really
everyone’s okay with their top two choices. Uh…so what we would have
is-is here…80 approvals… A would get 80 approvals,
uh…so we’re just gonna sort of ignore
their last choice here. So 80 approvals would come
from these people for A. Uh…and B
is gonna get, uh…is gonna get
80 approvals as well. Uh…from these voters,
B is gonna get 15 approvals, and C is gonna get
15 approvals. And these five people are gonna give C 5 approvals
and B 5 approvals. And so it turns out that, uh…A would receive
approval from 80 voters. Uh…B would receive approval
from everyone of the voters, and C would receive approval too
from 20 of the voters. Now…is this okay? I mean, that’s debatable, ’cause I mean, certainly
what we’re getting is the-the winning candidate,
which would be B here, is the one that is
apparently the least hated, uh…or the least disliked
among the choices. But certainly one
could argue that, with 80% of the voters
preferring A, that maybe A would’ve been
a better choice. Uh…it’s also
somewhat susceptible to, um…uh…strategic
insincere voting, uh…in which someone might not
vote the way they truly feel in order to influence
the results. Um…so for example,
in our vote here, uh…suppose that, um…
you know, maybe Bob and, uh… Bob and-and-and Alice here– and Alice’s name
somehow got…went missing– uh…so Bob and Alice,
you know, would really much rather
watch Scream. I mean, they’re okay
with watching the Matrix, but they’d much rather
watch Scream. Uh…so they
could insincerely vote, uh…by removing their approval
for that option. And if they did that, it would in…it would change
the result of the election. Uh…and so they could…
again, insincerely– or-or, you know,
against their true preferences– vote in a way that would
influence the result.

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Comments

  1. Video was fine until you started trying to explain the problems with approval voting. If people didn't want B to win, they shouldn't have voted for B. How is voting for scream because they want to watch scream insincere? How is it "against their true preferences" when you said moments ago they would very much prefer scream?

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