Logical ReasoningDifficulty: Medium

PT4 S1 Q3 Explanation

Oil analysts predict that

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Stimulus

Oil analysts predict that if the price of oil falls by half, the consumer’s purchase price for gasoline made from fall by half.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

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The question
3.

Which one of the following, if true, would cast the most serious doubt on the prediction made by

Answer choices

  1. No Impact2% picked this

    Improved automobile technology and new kinds of fuel for cars have enabled some drivers to

    This has nothing to do with the relationship between the price of oil and the pump price of gasoline.

  2. Opposite Impact4% picked this

    Gasoline manufacturers will not expand their

    A potential objection we'd have toward this prediction is, "Who says that if gas manufacturers have to pay 1/2 as much for oil that they'll pass this full savings onto the consumer? Maybe they'll choose to just increase their profit margin!" Since this rules out that possibility, it strengthens.

  3. Strengthens (if anything)2% picked this

    There are many different gasoline companies that compete with each other to provide the most

    Similar to (B), this makes it less likely that gas companies will just pocket the savings from reduced oil prices. They might be able to do that if they had a monopoly, but with so many companies competing, that will drive down gas prices, making the author's prediction more likely.

  4. No Impact15% picked this

    Studies in several countries show that the amount of gasoline purchased by consumers initially rises after the price

    This has nothing to do with the price of gasoline. It only talks about the quantity of gasoline sold.

  5. Correct77% picked this

    Refining costs, distribution costs, and taxes, none of which varies significantly with oil prices, constitute a large portion

    Why this is right

    Refining, distribution, and tax costs are significant portions of gasoline's price and don't vary with oil prices. Thus, even if the oil cost is halved, gasoline prices won't fall proportionally, as these other factors remain constant. This seriously weakens the analysts' prediction of a direct price drop by half. Let's say a gallon of gas costs $4 to the gas company, $1 - oil $1 - refining $1 - distribution $1 - taxes $4 total expenses So they sell the gas for $5 / gallon (in Los Angeles), so that they can profit $1. If the cost of oil gets cut in half, then now their expenses look like this: $0.50 - oil $1 - refining $1 - distribution $1 - taxes $3.50 total expenses The prediction was that the price of gas would fall by half, so now gas in LA would cost $2.50 / gallon? That doesn't make sense. The gas company would be losing money at that price point.

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

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