Who's right - help me settle a bet with gf, w/ poll w/o mspaint

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I have asked a lot of my other friends and, although they aren't so dumb as to refuse the offer, they also hold on to this "Don't sell stocks at a loss" thinking. So I'm inclined to think that either

1) The sunk cost fallacy is a really common thing, or
2) My friends are dumb

Which is the case?

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Is this a [censored] level? If its not then wow!