Misleading comparisons set two things side by side that are not truly comparable — different sizes, timeframes, quality tiers, or conditions — so that one looks better, worse, or equivalent by exploiting an unfair reference point. The manipulation lives in the baseline, not the arithmetic: the numbers on each side may be accurate while the comparison is rigged. Its close cousins are the false equivalence (treating unlike things as morally or factually the same) and the false analogy (declaring two situations parallel while suppressing the differences that matter).
The technique borrows its force from anchoring, the bias documented by Amos Tversky and Daniel Kahneman in which an initial reference number silently drags subsequent judgments toward it. A “was $200, now $80” tag anchors you to a price that may never have been real; a spec sheet pitting a rival’s base model against a premium unit anchors your sense of value; a debater equating a minor lapse with a major one flattens a distinction the audience should keep. Because each side can be individually true, the deception survives casual scrutiny and requires domain knowledge to unmask.
Defense is to fix the yardstick before trusting the measurement. Normalize both sides to the same units, timeframe, and tier; ask why this particular reference point was chosen; and compare against the alternatives you would actually pick among rather than the one handed to you. For analogies, name the difference that matters — if it is material, the equivalence collapses. A sound comparison holds up under like-for-like conversion; a misleading one only works while the mismatch stays hidden.