LSAT Inference and Must Be True

What It Tests

RC Inference questions ask you to identify something that must be true based on the passage, even though it is not directly stated. The answer must be strongly supported by evidence in the passage -- a small logical step, not a leap.

How to Identify the Question Type

• Which of the following can be inferred from the passage?
• The author would most likely agree with which of the following?
• The passage most strongly implies that...
• It can be concluded from the passage that...

Attack Strategy

• Step 1: Do not answer from memory -- go back and find the specific lines that support the inference
• Step 2: The correct answer should be nearly obvious given what the passage says
• Step 3: For 'the author would agree' questions, the answer must match the author's demonstrated attitude, not just the topic
• Step 4: Apply the Must Be True standard -- not 'could be true' or 'probably true'

Example Problem

Passage states: 'Unlike classical economists, behavioral economists have consistently found that human decision-making deviates from rational models in predictable ways.' Inference: Classical economists believed human decision-making followed rational models. NOT a valid inference: All economists now accept behavioral findings.

Common Wrong Answer Traps

• Answers that sound reasonable but go beyond what the passage actually supports
• Answers that confuse a view the author DESCRIBES with a view the author ENDORSES
• Answers that are true in the real world but not supported by this specific passage

Top Tips

• If you cannot point to specific lines in the passage that support the answer, it is probably wrong
• Answers that are extremely obvious tend to be correct on inference questions -- do not overthink
• 'Must be true' is a very high standard; eliminate anything that only might be true