What is the correct term for the following logical fallacy?

Speaker 1: I believe that increasing X by 5% would be a good thing.

Speaker 2: By your logic, increasing X by 5000% would be a 1000x better. That's crazy!

Is this considered a straw man argument, reductio ad absurdum or some other term?

  • 2
    A variant of this argument is sometimes called the slippery slope. It's a bit ambivalent whether it's really a fallacy: what's good for the goose is good for the gander, right? --In other words, sometimes it's valid and sometimes it isn't. If it's a good idea to do X sometimes, why isn't a great idea to do it all the time? Sometimes it might be :)
    – Joseph Weissman
    Dec 9 '13 at 21:45

Mathematically speaking, Speaker 2 error is linearly extrapolating Speaker 1 argument, although most things don't scale linearly beyond some narrow range.

  • I should have thought of that: linear extrapolation.
    – GSP
    Dec 10 '13 at 16:10

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