Cause and Effect

Cause and Effect

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Cause and Effect questions in LAT Analytical Reasoning test whether you can trace a stated chain of events from a triggering cause to a resulting effect, and pick the option that is necessarily true given the passage. Two ideas carry the section: necessity (if the cause is absent, the effect cannot occur) and sufficiency (if the cause is present, the effect must follow). A proximate cause is the most immediate trigger, not a remote background factor. Correlation is co-occurrence; causation requires the passage to actually state that one event produces the other. Transitivity applies: if A → B and B → C, then A → C. In the LAT, these items typically appear as one-line conclusions or “which of the following must be true” stems inside a logical reasoning passage.

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🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Definitions You Must Lock In

A cause is an event whose occurrence, as stated in the passage, makes another event possible or certain. An effect is the outcome that follows. A necessary cause must be present for the effect to occur, but several necessary causes may combine; any one missing breaks the chain. A sufficient cause, by contrast, guarantees the effect on its own. A proximate cause is the closest link in time or logic to the effect, while a remote cause sits earlier in the chain and is usually not what the question wants.

The Logical Machinery

LAT cause-effect items rest on three reasoning moves:

1. Necessity test — strip away each candidate cause; if the effect still holds, that candidate was not necessary.
2. Sufficiency test — verify that the chosen cause alone, without added assumptions from outside the passage, forces the effect.
3. Transitive chaining — combine stated links (A causes B, B causes C) to deduce that A causes C, even when no single sentence says so directly.

Reverse causation is a frequent trap: the stem may describe two events that happen together, and only the temporal order (“after X, Y occurred”) tells you which is cause and which is effect. Negative statements (“X did not lead to Y”) eliminate otherwise attractive options, so read every not, never, fails to in the passage.

Typical LAT Question Shapes

Question Type	What It Asks	The Move You Make
Must be true	Which effect necessarily follows?	Apply sufficiency to every stated cause
Must be false	Which effect is impossible?	Find a necessary cause that is absent
Main/Proximate cause	The most direct trigger	Pick the link closest to the effect
Strengthen / Weaken	Does the option fit the chain?	Add or break one transitive link

Common Mistakes

• Treating correlation as causation simply because two events appear in the same paragraph.
• Choosing a remote background factor when the question asks for the proximate trigger.
• Reading a sufficient condition as necessary, or vice versa.
• Importing real-world knowledge (“of course rain causes wet roads”) instead of following only the stated links.

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🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Edge Cases and Subtler Patterns

Some LAT stems embed counterfactual reasoning: “If X had not occurred, Y would not have occurred.” That phrasing signals a necessary relationship — Y depends on X — even though the conditional is hypothetical. Distinguish this from a counter-example passage that lists a case where the usual cause was present but the effect did not follow; such a passage is designed to break a sufficiency assumption, so the correct answer usually weakens the proposed cause.

Multiple sufficient causes create another trap. If the passage says “Either A or B will trigger C,” and the question asks which event must have happened, neither A nor B is individually necessary — only their disjunction is. The right answer will often be the disjunction itself, or a downstream effect that both A and B share.

Indirect effects are reached by chaining. A → B → C means A is a remote cause of C. If the question asks for the direct effect of A, C is wrong; the direct effect is B. Track the number of arrows.

Connection to Adjacent Topics

Cause and Effect overlaps heavily with Syllogisms (deducing a conclusion from stated premises) and If–Then / Conditional Reasoning (necessary vs. sufficient conditions). It also feeds into Critical Reasoning assumption questions, where the hidden assumption is often an unstated causal link.

Worked Mini-Example

Passage: “Because the contract was signed, the deposit was paid. The deposit being paid triggered the title transfer.” Question: Which must be true? Chain: Contract signed → Deposit paid → Title transferred. By transitivity, signing the contract causes the title transfer (indirect). The direct effect of signing is the deposit; the direct effect of the deposit is the title transfer. An answer saying “the title transferred” is necessarily true but is reached via a two-step chain — acceptable if the stem allows indirect effects, rejected if it demands the immediate effect.

Two Practice Prompts

1. Passage states: “Rainfall caused the river to rise. The rising river caused flooding. Flooding caused crop loss.” Question: “Which is the proximate cause of crop loss?” — Answer the link one step before crop loss.
2. Passage: “Either a power cut or a server crash will cause the website to go offline. The website went offline, but the server did not crash.” Question: “Which must be true?” — Use the disjunction plus the negation to deduce the power cut.

Exam Strategy for LAT

Cause-effect items usually weigh around 4% of Analytical Reasoning. Budget roughly 60–90 seconds each. Read the passage once for the causal arrows, then circle every cause, because, therefore, results in, and if–then before touching the options. Eliminate any choice that smuggles in outside knowledge or reverses the temporal sequence.

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