Logical ReasoningDifficulty: Hard

PT135 S2 Q13 Explanation

Humanitarian considerations aside

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsNecessary Assumption

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Stimulus

Humanitarian considerations aside, sheer economics dictates that country X should institute, as country Y has done, a nationwide system of air and ground transportation for conveying seriously injured persons to specialized trauma centers. Timely access to the kind of medical care that only specialized centers can provide could save the lives of product, and the taxes paid on those earnings would substantially augment government revenues.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
13.

The argument depends on the assumption

Answer choices

  1. Irrelevant Relationship9% picked this

    lifetime per-capita income is roughly the same in country X as it is

    The per-capita income need not be the same in both countries for the comparison of the two countries to hold.

  2. Weaken4% picked this

    there are no specialized trauma centers in country X

    This makes it less likely that building a system to convey seriously injured patients around the country will result in saving lives.

  3. Irrelevant Comparison14% picked this

    the treatment of seriously injured persons in trauma centers is not more costly

    The issue is whether the cost of treatment outweighs the additional income that could be expected from saving the lives of seriously injured persons.

  4. Correct64% picked this

    there would be a net increase in employment in country X if more persons

    Why this is right

    The intermediate conclusion assumes that there will be a net increase in employment because it attributes the increased gross national product to “the earnings of these people.” This implies that people who survive serious injury reenter the workforce.

    Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.

  5. Too Strong9% picked this

    most people seriously injured in automobile accidents in country X do not now receive treatment

    Too Strong: most Out of Scope: automobile accidents The word "most" is famously wrong on Necessary Assumption because we so rarely care whether something is true of at least 51% of the time vs. at most 49% of the time. In addition, why are we specifically talking about auto accidents? Nothing in the argument was fixated on a specific type of accident that needs emergency care. If we negate this and say that "most serious auto injuries ARE currently treated in specialized trauma centers", would that weaken? It might start to feel like that does weaken, as though we could argue -- "Bah! Why bother building that system of air/ground transportation for getting people to specialized centers? More than 50% of serious auto injuries are already treated there!" But the author wouldn't be too troubled by that objection. She could say, "I want that system so that the other 49% of auto injuries can also be treated at special centers; also, currently anyone who gets injured on a mountain or a river or any non-automobile place has no way to get treated at those special centers, so I want the system to save their lives."

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