Steelman
Fallacy of division
Also called division, whole-to-part fallacy.
Assuming that what’s true of the whole must be true of each part.
What it is
Inferring that each part or member of a whole has a property because the whole has it.
The pattern
W has property P. Therefore every part of W has property P.
An example
“This is a world-class university, so every professor here must be world-class.”
A university’s reputation reflects the institution overall. Individual professors vary.
Why it fails
A whole can have properties that emerge from its parts together, and those don’t pass down to individual parts.
When it’s not a fallacy
Most lists skip this part. Calling a fair point a fallacy is a mistake too.
It can be fair when
- The claim about the whole was about each member to begin with: “the whole class passed the exam” does mean each student passed.
Try one
A question from the app. The wrong answers are its usual look-alikes.
Ava: “My cousin’s band has 200,000 streams on their album, and they’ve made about $600 from them.” Ben: “Spotify alone pays out around $10 billion a year to the music business. That’s not small change. That money goes to musicians. Nobody’s getting ripped off. Tell your cousin to pitch the songs to playlists; that’s where the streams are.”
What’s the flaw?
A huge payout to the industry as a whole says nothing about what each artist gets. Most of it goes to labels and the biggest acts, so a small band can still earn very little.
A fair reply
“That’s the total, and my cousin’s band got $600 of it for 200,000 plays.”
Often confused with
- Fallacy of composition
Composition runs from parts to whole. Division runs from whole to parts.
- Accident
Accident misapplies a general rule to an exceptional case. Division moves a property of a whole onto its parts.
Where the name comes from
Division splits a whole into its parts, like a band into its members or a team into its players. The fallacy hands a property of the whole down to each piece. “Whole-to-part fallacy” names that direction, the reverse of composition.
Sources
- Fallacies, Bradley Dowden, Internet Encyclopedia of Philosophy
In the app
Practice spotting it on arguments that sound real.
Steelman has more examples of fallacy of division, how to answer it in a real conversation, and practice rounds that mix it with its look-alikes, so you learn the difference, not just the name. Coming soon to iPhone and Android.
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