Logical ReasoningDifficulty: Medium

PT146 S3 Q11 Explanation

From 1880 to 2000 Britain’s economy

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

TopicsMust be False

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Stimulus

From 1880 to 2000 Britain’s economy grew fivefold, but emissions of carbon dioxide, a greenhouse gas, were the same on a per capita basis as they were in 1880.

What this question is testing

Must be False

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence 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
11.

The claims made above are incompatible with which one of the

Answer choices

  1. Compatible4% picked this

    A decrease in per capita emissions of carbon dioxide never occurs during a period

    This rule would diagram like this: period of ? no decrease in emissions econ growth An incompatible situation would be one in which it was a period of economic growth, and there was a decrease in per capita emission (PCE). But out situation didn't involve a decrease in PCE.

  2. Compatible Out of Scope: afford laws4% picked this

    Countries whose economies are growing slowly or not at all usually cannot afford to enact laws

    An incompatible situation for this principle, Growing slowly ? can't afford emissions laws would involve a situation where - the economy was growing slowly and - they could afford to enact emissions laws. The stuff we heard about Britain didn't establish either of those ideas.

  3. Compatible8% picked this

    Economic growth initially leads to increased per capita emissions of greenhouse gases, but eventually new technologies are developed that

    Since Britain's economic growth quintupled, this generalization would expect that emissions would initially go up, but then new technology would save the day and reduce the per capita emissions level. Britain's 1880 emissions level is the same as its 2000 level, but we don't need the emissions level to have been constantly the same throughout those 120 years. This answer choice tells an econ growth / emissions level story that could very well have applied to Britain. It certainly doesn't contradict what happened in Britain. It allows for a period of economic growth eventually ending up at the emissions level where it started.

  4. Out of Scope:5% picked this

    As the world’s population grows, emissions of greenhouse gases will

    world population

  5. Correct79% picked this

    Economic growth always increases household income and consumption, which inevitably increases per capita emissions

    Why this is right

    This is a three part principle, but we will still violate it by showing a situation in which the left side is true, but the right side isn't. econ growth ? more house $ ? higher emissions In Britain, there was economic growth (5x the 1880 economy) but comparable levels of per capita emissions.

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

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