Logical ReasoningDifficulty: Hard

PT152 S2 Q25 Explanation

The more demand there is

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

TopicsNecessary Assumption

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Stimulus

The more demand there is for something, the easier it is to sell. Any junkyard will buy a used car that is less than ten years old, because the parts can easily be resold. However, because there is little demand for car parts that are ten years old or older, junkyards tend easier to sell than are cars that are ten years old or older.

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
25.

Which one of the following is an assumption on which the

Answer choices

  1. Too Strong: not influenced by any20% picked this

    The salability of something is not influenced by any factors other than the level of

    Although the author is saying that more demand increases salability, she hasn't committed herself to the idea that more demand is the only factor that increases salability.

  2. Too Strong: all5% picked this

    All used cars that are ten years old or older are

    Even though the author is for some reason focused only on how easy it would be to sell these cars to junkyards, she hasn't committed herself to the idea that ALL used cars older than 10 years get sold to junkyards. The squishy conclusion "generally easier to sell" allows for exceptions.

  3. Out of Scope8% picked this

    In general, the older something is, the more difficult it is

    Out of Scope: in general Too Strong: the more X, the more Y She doesn't have to be making assumptions about how AGE relates to DEMAND when it comes to other types of commodities. Maybe when it comes to selling clothes or furniture or baseball cards or toys, the older stuff has a lot of retro, vintage value and is easier to sell.

  4. Out of Scope8% picked this

    When determining the selling price of cars less than ten years old, the lack of demand would not be offset

    Out of Scope: lack of supply Opposite: lack of demand Since the author is saying that there's more demand for cars less than ten years old, it doesn't seem like she mentioned or assumed anything about a lack of demand for cars less than ten years old.

  5. Correct59% picked this

    The salability of cars that are ten years old or older is largely a function of the level

    Why this is right

    The "largely" in this answer matches the strength of the "generally" in the conclusion. Since her conclusion is about how easy cars are to sell, and her evidence is exclusively about how easy they would be to sell to junkyards for parts, she is assuming that the primary market for these older cars is selling them to junkyards for parts. If we negate this and say, "the salability of older cars is minimally a function of how much demand there is for their parts", it would make the Evidence seem much less compelling or relevant. Since the negation weakens, the answer is correctly expressing an assumption.

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

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