Comparative RC has its own stem family.
One misread word flips the right answer.
Comparative passages have stems unique to two-passage sets. Misreading one word in the stem flips the right answer. The five stem types and the words to watch.
Key takeaway
What to remember about Comparative RC stem misreads
Comparative Reading Comprehension passages introduce stem patterns that do not appear in single-passage RC. Each comparative set asks about agreement, disagreement, scope, or method across the two authors. One misread word in the stem flips the right answer. A pre-read stem tag and a two-second author-position check catch the misreads before they happen.
On this page
Single-passage RC has one author and one structural model. Comparative RC has two authors, two models, and a relationship between them. The question stems exploit the relationship. One misread word in the stem flips the right answer.
The pattern is consistent across mocks. A student who scores above the band on single-passage RC drops on comparative without noticing the drop is structural. The score loss is not reading speed and it is not vocabulary. It is stem-parsing on a stem family that never appeared on the single-passage diet.
Both authors agree is not each author addresses.
Why comparative stems behave differently
Single-passage RC asks about one author's argument. The reader builds one structural model, then answers questions against that model. Comparative RC asks about two authors' arguments, sometimes about their relationship, sometimes about one in light of the other. The structural model is two models, and the relationship between them.
The questions live in the relationship. The right answer to "both authors would agree" is different from the right answer to "each author would agree." The right answer to "passage A but not passage B" is different from the right answer to "the author of passage A would say about passage B." The words "both," "each," "but not," and "would say about" are the trap doors.
Comparative does not test reading speed. It tests precision on stem parsing.
Introduced June 2007. Appears once on every LSAT since.
Source: LSAC
Three patterns of miss
The misses cluster around three stem families. Naming the families is the first step. Tagging the family before reading the passages is the habit that closes the gap.
- Both-vs-scope. 'Both authors would agree' requires a claim endorsed in both passages. A scope stem ('which of the following is discussed in both passages') only needs topic presence in each. Tag whether the stem demands endorsement or just coverage.
- A on B. 'The author of passage A would say about passage B' makes A the lens and B the object. The right answer applies A's voice to B's content. Fix: tag which passage is the voice.
- Method contrast. 'Passage B does what passage A does not' is a structural question, not a content question. The right answer names a move, not a fact. Fix: read the stem as a method stem before scanning answers.
This post connects to RC Inference and RC Function. Comparative stems blend the two: most stems ask either what the passages support together or what role one author plays relative to the other. The skill map drills each node separately, then mixed.
A real comparative study plan
Volume is not the bottleneck. Pattern recognition for the stem set is. The plan below works for high scorers stuck below the band on comparative.
| Read both passages, then read the stem. | Read the stem first. Tag the stem family in two words. Then read. | The stem family tells you whether to read for agreement, lens, or method. Reading the passages without the search loaded means a second pass for every question. |
| Treat "both" and "each" as the same word. | Read the quantifier out loud on first stem read. | Both requires joint support. Each requires individual coverage. The right answer changes; the test rewards the distinction. |
| Drill comparative passages in the same set as single-passage RC. | Drill comparative passages in a separate set for two weeks. Reintegrate after. | The stem families are unique to comparative. Mixed drilling dilutes the pattern recognition until the unique families lock in. |
The worked example
The question below is a comparative RC item with a "both authors would agree" stem. This is the most commonly misread stem type in the comparative set. Read the stem. Confirm the standard: joint endorsement, not topic coverage. Build one skeleton per passage. Then check each choice against both.
Passage · 7 paragraphstoggle
Passage A
I bought Pinaka Books on Pennsylvania Avenue five years ago because I believed the two dominant models for running an independent bookstore were both wrong. The full-retail model treats every section the same and assumes price does not affect the customer who already walked in. The member-discount model assumes loyalty is the scarcest resource and discounts indiscriminately to protect it. Neither model asks what drives purchase behavior inside a specific section.
My operating thesis is narrower. Pricing outcomes depend on the context of each section, not on a single store-wide philosophy. Legal-reference customers treat price as a secondary factor because the purchase is tied to professional necessity. Fiction customers are more sensitive to price because the purchase is discretionary. History customers occupy a middle position.
Last quarter I tested all three simultaneously. The data confirmed the thesis. Fiction sales were flat under full-retail. History saw a subscriber-discount lift, but the lift came entirely from existing subscribers, not new ones. Legal-reference performance was stable under dynamic pricing because those customers were not responding to price at all. A store that prices by section can optimize each section independently. The returns justify the operational attention required.
Passage B
Dynamic pricing and section-specific discounting have gained attention among independent bookstore operators in recent years. The appeal is intuitive: different customers have different price sensitivities, and treating all sections identically leaves revenue on the table. The appeal does not survive contact with two operational realities.
First, customers at independent storefronts develop expectations through repetition. A legal-reference customer who finds a title priced at eighty dollars one week and ninety-two dollars three weeks later does not conclude that prices fluctuate. She concludes that the store cannot be trusted. Research on price variability in independent retail consistently shows that trust erosion from dynamic pricing exceeds the short-term margin gain in stores below roughly two hundred transactions per day. Most independent bookstores do not approach that volume.
Second, section-specific pricing strategies require staff to hold multiple pricing rules simultaneously. Training costs rise. Error rates rise. Customer complaints about pricing inconsistency are, in this industry, among the top five drivers of one-star reviews.
The enthusiasm for fine-grained pricing models among independent operators is understandable. The evidence that those models improve outcomes at sub-two-hundred-transaction venues is not there.
The authors of Passage A and Passage B would most likely agree with which one of the following statements?
The stem demands joint endorsement. Choice (E) is covered in Passage A only. Choice (A) is the one claim both authors commit to.
Agreement stems require a claim both authors would sign. Build a one-sentence skeleton for each passage. Then check each choice against both. Eliminate any choice that one author contradicts or that only one passage covers.
Joint-endorsement stems fail on topic coverage. An answer can be true in one passage and absent or contradicted in the other. Both passages must support the credited answer.
Budget 75-90 seconds. Build both skeletons before reading choices. Eliminate choices one author contradicts first. Choices one author simply does not address are the harder cut.
Common questions
What is a comparative passage on the LSAT?
A comparative passage set is two short passages on a related topic, replacing one of the four long passages in the Reading Comprehension section. The set typically carries five to seven questions, some testing the relationship between the two passages and some testing each passage on its own.
How do I read comparative passages efficiently?
Build a one-sentence skeleton for each passage before answering any question. The skeletons name what each author claims. Most comparative questions are answerable by checking whether a choice matches one, both, or neither skeleton.
What is the difference between "both authors would agree" and "each author addresses"?
Both-agree stems require a claim endorsed in both passages, not just consistent with each. A scope or coverage stem (which of the following is discussed in both passages) only needs topic presence. Tag whether the stem demands endorsement or just coverage.
When did comparative passages start appearing on the LSAT?
LSAC introduced the comparative format in June 2007. It has been a fixture of Reading Comprehension since.
Next steps
Two habits. Apply to every comparative passage from today.
Read the stem before the passages. Tag each question with its family in two words. Both-agree. A-on-B. Method-contrast. Each-on-its-own. The tag drives the search; the search drives the answer elimination.
Drill comparative passages in a separate set from single-passage RC for two weeks. Four comparative passages a week with full stem-by-stem review beats twelve comparative passages with no review.
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