Logical ReasoningDifficulty: Medium

PT154 S2 Q15 Explanation

Journalist: Despite the recent spate

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

TopicsNecessary Assumption

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Stimulus

Journalist: Despite the recent spate of depressing political news, many investors are putting money into stocks. Clearly, these investors are confident of increased growth in the country’s economy. Thus, since voter confidence in the economy tends to favor incumbent political leaders, it power will retain power after the upcoming elections.

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
15.

Which one of the following is an assumption required by the

Answer choices

  1. Too Strong: major factor4% picked this

    The economic policies pursued by the government are a major factor in producing

    The author could believe major factor, minor factor, no factor ... it wouldn't make any difference in her argument. She only needs to believe that voters tend to vote for incumbents when the economy is doing well. That may be because voters are convinced that the incumbent government must be a major factor in why the economy is sizzling, but our author doesn't need to have that belief. She's just predicting an election result, not evaluating it as a right / wrong.

  2. Out of Scope: investment choices11% picked this

    The investment choices of voters tend to reflect their

    This argument doesn't need to assume that voters invest any money, let alone that they invest it in a way that reflects their politics. The author has to assume that "if investors are confident in the economy, then so too are voters", but that doesn't require that voters are themselves investors. Our author is thinking that the political preferences of voters will tend to reflect their confidence in the economy, not that their political affiliations will tell them where to invest their money.

  3. Correct77% picked this

    The economic attitudes of investors do not differ greatly from those of

    Why this is right

    In order for the author's claim 2 and claim 3 to join forces, we need to assume that "if investors are confident, then voters are confident". This answer choice is addressing that gap. If we hadn't anticipated this gap, we should still have slowed down and considered this answer when we saw its enticing ruling out "no / not" language (which is a hallmark of many correct Necessary Assumption answers). If we negate this answer, does it weaken? The economic attitudes of investors do differ greatly from those of voters in general. Yes! The author only established that investors are confident in the economy. But her election prediction hinges on the idea that voters are confident in the economy and will thus reward the incumbent party by "renewing their lease".

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

  4. Opposite, if anything8% picked this

    Voters generally attribute some responsibility for the state of the economy to the policies

    The notion of previous governments is completely out of scope. We only care about who will likely win this upcoming election. Since the author is predicting that voters will reward the incumbents with a victory based on the successful economy, she is probably thinking that voters credit the current government with the state of the economy.

  5. Out of Scope Comparison1% picked this

    Voters are usually more loyal to parties than to

    Nothing in this argument deals with the distinction between supporting a party and supporting an individual politician. The author's logic doesn't care whether people are usually more loyal to A than B, more loyal to B than A, or loyal to both of them about equally. It has no logical bearing on her prediction about the upcoming election.

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