Logical ReasoningDifficulty: Hard

PT118 S3 Q13 Explanation

Harrold Foods is attempting to

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

TopicsFlaw

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Stimulus

Harrold Foods is attempting to dominate the soft-drink market by promoting “Hero, ” its most popular carbonated drink product, with a costly new advertising campaign. But survey results show that, in the opinion of 72 percent of all consumers, “Hero” already dominates the market. Since any product with more than 50 percent only maintain its current market share in order to continue to do so.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that gap.

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 commits which one of the following errors

Answer choices

  1. Not Causal8% picked this

    failing to exclude the possibility that what appears to be the result of a given market condition may in fact be

    This answer is referring to the Famous Causal Flaw, in which an author is overconfident about one possible causal explanation, while failing to consider other possible causal explanations. In particular, this answer is saying that author failed to consider the possibility of Reverse Causality. But nothing in this argument is at all causal, so this is just meant to sound tempting because it sometimes shows up as a correct answer.

  2. Not Necessary vs. Sufficient16% picked this

    mistaking a condition required if a certain result is to obtain for a condition that by itself is

    This answer is referring to the #1 Famous Necessary vs. Sufficient Flaw, in which the author presents a conditional logic premise and then tries to apply it by using an illegal negation or reversal. But nothing in this argument is at all conditional, so this is just meant to sound tempting because it sometimes shows up as a correct answer.

  3. Not Unproven vs. Proven False1% picked this

    treating the failure to establish that a certain claim is false as equivalent to a demonstration that

    This answer is referring to the famous Unproven vs. Proven False flaw, in which an author takes a failure to prove X true shows that X is false (or, as this answer describes, a failure to prove X false shows that X is true) This argument doesn't involve any sort of rebuttal. The evidence never says that someone failed to prove a certain claim false.

  4. Correct65% picked this

    taking evidence that a claim is believed to be true to constitute evidence that the claim

    Why this is right

    The author is arguing that Harrold currently dominates the market, based on the fact that 72% of consumers surveyed think that Harrold dominates the market. It is believed to be true that "Harrold dominates the market" and the author acts like that's evidence for the conclusion that "Harrold does in fact dominate the market".

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

  5. Too Strong: bound to obtain10% picked this

    describing survey results that were obtained in the past as if they are bound to obtain in

    The author isn't ever predicting that survey results will be sure to obtain in the future as well. He makes no guarantee that future surveys will show that 72% of consumers think Harrold dominates the market. He only guarantees that if Harrold currently dominates the market, then they will continue to do so in the future as well if they maintain their current market share.

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