Cause & Effect
Cause & Effect
IBPS PO mains and UPSC CSAT present 2-4 cause-effect questions where you receive two statements and determine whether one causes the other, both stem from a common cause, or both are independent. You must establish a direct and necessary logical link, not just a correlation or temporal sequence. Applying the directionality check and common-cause rule systematically helps you score near-perfect on this topic.
Key Idea
Ask: 'Does Statement I necessarily produce Statement II, or vice versa?' If neither direction is necessary, look for a hidden common cause. Temporal precedence alone does not establish causation.
Core Rules
Directionality Check
Test both directions: 'Does I cause II?' and 'Does II cause I?'; the correct direction is the one where the first event is a sufficient and necessary precondition for the second
Run this test first to decide which direction the causation flows before picking an answer option.
Independent Events Rule
If the two statements belong to entirely different domains (e.g., weather and stock market) and no logical mechanism links them, mark them as independent causes or independent effects
Mark statements independent when they appear temporally close but no plausible causal mechanism connects their domains.
Common Cause Rule
If both statements are outcomes that share a single upstream trigger (e.g., both are results of a government policy change), mark them as 'effects of an independent common cause'
When both statements describe negative or positive changes that would logically share the same root event.
Scale and Specificity Rule
A macro-level event (e.g., nationwide strike) can cause a micro-level effect (e.g., local shortage), but a micro-level event rarely causes a nationwide macro effect on its own
When one statement is broad and the other is narrow; the broader event is typically the cause.
Both Causes Rule
When two independent events together produce a third outcome (implied or stated), both statements are causes — neither alone is sufficient
When the question hints that the combined effect only arises if both conditions are simultaneously true.
Relevant Exams
Cause-Effect questions appear in 2–4 question sets in IBPS PO mains and UPSC CSAT. They reward structured logical thinking over intuition — candidates who apply the directionality and common-cause rules consistently score near-perfect on this topic.