Hi readers,
Sorry I haven’t written in a while—things have been a little crazy on my end. But I was listening to a story on NPR and wanted to write a post about it.
I’m sure many of you have heard about the newly approved one-year moratorium on the development of new fast-food restaurants in
The consultant’s statement appears to be an example of an irrelevant comparison. In order for a comparison to be relevant, the items being compared have to be equivalent in all aspects relevant to the matter being discussed. It seems clear that there are relevant differences between a comparison of fast food and healthier options when placed next to Chevys and Benzes:
a.) The moratorium doesn’t ban fast food restaurants or the sell of fast food; rather, it just prohibits new fast food stores from being opened. The consultant’s comparison proceeds as though the former is true, even though it clearly isn’t.
b.) Part of this confusion may arise from a lack of a clear meaning of “fast food” and “fast-food restaurant” (for the purposes of the moratorium). Does the definition involve a food’s nutrition content, method of preparation, both, or some completely different criteria? Admittedly, I haven’t seen the actual text of the measure, so I may just be ignorant of the fact that a definition is incorporated there. But if not, without a clear definition of terms, it seems nearly impossible to determine what a relevant comparison is.
c.) My best guess is that the consultant wanted to focus on the price difference between fast food and healthy food, relating it to relatively inexpensive Chevys and relatively costly Benzes. But the cost difference in the types of food is coupled with a fundamental difference in public safety—assuming that fast-food usually has low nutritive value and therefore negatively affects public health (an assumption that I think is valid), while healthier options by comparison are less likely to have such a negative affect. As far as I know, Chevys aren’t less safe than Benzes.
Perhaps a more relevant comparison would be: “It’s like saying we’re not going to allow anyone to buy cars from dealerships for one year whose best-selling products notoriously hazardous to consumers’ health because we only want people to buy cars that we view as safer.” And upon closer analysis, one may even find that my revised comparison doesn’t pass muster. That’s why comparisons are notoriously difficult to form between two sets of entities—all you need is one relevant difference between the pairs being compared, and the reasoning can crumble.
Can you think of any examples of irrelevant comparisons?