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Time Shift Flaws (Past vs. Future)

13 questions

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Question 1Question →

Economist: Throughout the twentieth century, whenever a major manufacturing sector in our country was rendered obsolete by technological advancement, the resulting localized unemployment was consistently resolved within a decade. In each instance, the very innovations that drove the obsolescence spawned secondary industries that required the exact skill sets of the displaced workers, thereby offsetting the initial job losses. Consequently, the upcoming transition to autonomous, AI-driven logistics networks will not result in long-term structural unemployment. Although truck drivers and warehouse operators will be displaced, the AI revolution will inevitably generate new sectors that will quickly absorb these workers.

Which one of the following most accurately describes a flaw in the economist's reasoning?

Show answer & explanation

Answer: presumes without warrant that the specific economic dynamics that mitigated the effects of technological displacement in the past will operate similarly during a fundamentally different kind of technological transition in the future

Answer

The correct answer is the option that points out the argument presumes without warrant that the specific economic dynamics that mitigated the effects of technological displacement in the past will operate similarly during a fundamentally different kind of technological transition in the future.
The argument's central error is treating a historical pattern as a guarantee for the future. The economist establishes that in the twentieth century, manufacturing displaced by technology resulted in new industries requiring the exact skills of the displaced workers. From this, the economist leaps to the conclusion that AI automation in logistics will inevitably produce the same outcome. This is a classic Time Shift Flaw: it fails to consider that the impending AI transition might be fundamentally different from past manufacturing transitions (e.g., AI might not create secondary industries that require human warehouse operators), making the historical precedent inapplicable.

Step-by-Step Solution

1
Analyze the structure of the economist's argument.
Identify the premises regarding twentieth-century manufacturing obsolescence and the conclusion regarding the future AI-driven logistics transition.
Understanding the timeline of the provided evidence versus the scope of the conclusion is crucial for identifying temporal flaws.
2
Identify the logical leap between the premises and the conclusion.
The argument uses historical evidence of job recovery to guarantee the exact same outcome for a future, unprecedented technological shift.
Flaws often occur when an argument assumes that what happened in the past guarantees what will happen in the future, ignoring changing contexts.
3
Evaluate the options for a description of a Time Shift Flaw.
Locate the option that criticizes the argument for projecting a historical pattern onto a future event without justification.
The correct answer must accurately abstract the specific temporal error made in the stimulus without introducing irrelevant critiques.

Key Concept

Time Shift Flaws occur when an argument unjustifiably assumes that conditions or trends observed in the past or present will remain unchanged in the future, despite potential differences in context.
Question 2Question →

Retail Analyst: Over the past five years, our chain of sporting goods stores has seen a 10 percent increase in profits each year. We have not changed our management team or our marketing strategy during this period, and we plan to keep both exactly the same for the next five years. Thus, our chain is guaranteed to see a 10 percent increase in profits each year for the next five years.

Which one of the following most accurately describes a flaw in the retail analyst's reasoning?

Show answer & explanation

Answer: unjustifiably assumes that a trend observed over a specific past period will continue into the future merely because certain internal factors remain unchanged

Answer

The correct answer is the option stating that the argument unjustifiably assumes a past trend will continue into the future merely because certain internal factors remain unchanged.
The argument concludes that profits will continue to grow at 10 percent annually for the next five years simply because the management and marketing strategy will not change. This reasoning is flawed because it assumes that static internal conditions guarantee the continuation of a past trend, failing to account for external variables (such as market saturation, new competitors, or broad economic shifts) that could change over time.

Step-by-Step Solution

1
Identify the premises and conclusion of the argument.
Premises: Profits increased by 10% annually over the last five years, and management/marketing will remain exactly the same. Conclusion: Profits will continue to increase by 10% annually for the next five years.
Deconstructing the argument is the first step in evaluating its logical structure.
2
Analyze the gap between the premises and the conclusion.
The argument uses past data and static internal conditions to guarantee a future outcome.
Identifying the assumption bridging the premises and conclusion reveals the reasoning flaw.
3
Categorize the reasoning error.
The argument commits a time shift flaw by presuming that what occurred in the past will persist in the future without accounting for external variables.
Matching the structural gap to standard logical fallacies allows for accurate selection among the choices.

Key Concept

Time Shift Flaws (Past vs. Future)
Question 3Question →

Human Resources Director: A decade ago, our firm implemented a mandatory weekly in-person brainstorming policy, which directly caused a significant improvement in our productivity and innovation metrics over the following year. As we restructure our operations next quarter, we will reinstate this exact same policy. Clearly, this action will once again lead to a similar surge in productivity and innovation.

Which one of the following most accurately describes a flaw in the reasoning of the Human Resources Director's argument?

Show answer & explanation

Answer: takes for granted that the circumstances that allowed the policy to succeed in the past will be present when the policy is implemented in the future

Answer

The option stating that the argument takes for granted that the circumstances that allowed the policy to succeed in the past will be present when the policy is implemented in the future.
The argument bases its entire prediction about future success on a single historical precedent from a decade ago. This reasoning is flawed because it ignores the high likelihood that relevant corporate circumstances—such as remote work capabilities, workforce demographics, or communication technologies—have fundamentally changed over ten years, potentially altering how effective the policy will be today.

Step-by-Step Solution

1
Deconstruct the argument into its structural components.
Premise: A decade ago, a specific policy directly caused productivity to improve. Conclusion: Reinstating the same policy next quarter will cause a similar improvement.
Identifying the premise and conclusion is required to locate the logical gap in the author's reasoning.
2
Analyze the logical gap between the premise and the conclusion.
The argument moves from a historical fact (an event ten years ago) to a future prediction (next quarter) without demonstrating that the two time periods are comparable.
Evaluating how the premise supports the conclusion reveals unwarranted assumptions.
3
Identify the specific flaw archetype.
The argument commits a Time Shift Flaw by assuming that a static environment has persisted over a decade.
Categorizing the flaw allows for quick matching with the correct abstract description in the options.

Key Concept

Time Shift Flaws occur when an argument assumes, without justification, that conditions operating in the past will continue to operate in the future, or that historical trends will persist unchanged.
Question 4Question →

Urban Planner: Over the past three decades, the city's targeted tax incentives for tech companies have consistently stimulated job growth and successfully driven down the local unemployment rate. The city council has just approved a new round of identical tax incentives for tech startups. Therefore, we can confidently expect the local unemployment rate to fall over the next two years.

Which of the following identifies the most serious flaw in the urban planner's reasoning?

Show answer & explanation

Answer: bases a prediction about a future outcome on a past pattern without establishing that the conditions enabling that pattern remain in place

Answer

The correct answer identifies that the argument draws a conclusion about a future outcome based on a past pattern without verifying that underlying conditions remain unchanged.
The argument relies entirely on the premise that a specific policy was successful over the past thirty years. It then leaps to the conclusion that an identical policy will be successful over the next two years. This reasoning is flawed because it fails to consider whether the surrounding circumstances—such as the overall health of the tech industry, the availability of skilled labor, or broader economic trends—have remained static enough for the historical pattern to reliably repeat itself.

Step-by-Step Solution

1
Analyze the structure of the argument.
Premise: Past tax incentives caused the unemployment rate to drop. Premise: Identical incentives were just approved. Conclusion: The unemployment rate will drop over the next two years.
Deconstructing the argument is necessary to isolate the logical leap between the evidence provided and the claim made.
2
Identify the gap between the premises and the conclusion.
The argument uses evidence from the past (the last three decades) to guarantee a result in the future (the next two years).
Locating the shift in time reveals the core assumption the author is making.
3
Determine the specific logical fallacy.
The author commits a time shift flaw by assuming that because a policy worked under past conditions, it will automatically work under present/future conditions, ignoring potential changes in the labor market.
Matching the structural gap to a recognized logical flaw allows us to accurately select the correct criticism among the options.

Key Concept

Time Shift Flaws (Past vs. Future)
Question 5Question →

Marine Biologist: For the past two decades, the population of staghorn coral in the southern reef has declined by exactly 5 percent each year due to rising average water temperatures. Our latest climate models project that water temperatures in this region will continue to rise at an identical rate over the next twenty years. Therefore, we can confidently predict that the staghorn coral population will continue to shrink by 5 percent annually during this future period.

Which of the following accurately describe a logical flaw in the marine biologist's reasoning? Select all that apply.

Select all that apply

Show answer & explanation

Answer: It takes for granted that a statistical trend observed over a past period will inevitably persist into the future.; It fails to consider that the entities subjected to a continuing condition might change over time in ways that alter their future responses.

Answer

The correct options are those indicating that the argument unjustifiably projects a past trend into the future and ignores potential biological changes in the population over time.
The marine biologist's argument exhibits a classic time shift flaw. It assumes that a trend observed in the past will inevitably continue into the future simply because one driving environmental factor (rising temperatures) remains constant. This reasoning is flawed in two key ways described by the correct options: first, it broadly assumes past statistical trends guarantee future outcomes without justification; second, it fails to consider that the coral population itself might change over time—for instance, the surviving coral might be more heat-resistant, meaning the future rate of decline could decrease.

Step-by-Step Solution

1
Identify the argument's premises.
The coral population declined by 5 percent annually over the past twenty years due to rising temperatures, and temperatures will continue to rise at the same rate.
Understanding the foundation of the argument is necessary to evaluate its logic.
2
Identify the argument's conclusion.
The coral population will inevitably continue to decline by 5 percent annually over the next twenty years.
The conclusion reveals the leap in logic made by the author.
3
Evaluate the logical gap (flaw) between the premises and the conclusion.
The author assumes that identical environmental conditions will produce the exact identical biological responses indefinitely, ignoring the passage of time.
Identifying the time shift flaw is required to evaluate the answer choices.
4
Analyze the options to find accurate diagnostic descriptions of this temporal flaw.
One correct option correctly describes the assumption that historical trends will persist unchanged. The other correct option notes the failure to account for potential adaptation or changes in the coral population's characteristics over time.
A multi-select flaw question requires identifying all valid angles of the argument's vulnerability.

Key Concept

Time Shift Flaws (Past vs. Future)
Question 6Question →

Energy Policy Analyst: Historically, over the last four decades, sudden and severe spikes in the price of imported petroleum have caused prolonged economic downturns in our country by drastically increasing manufacturing and transportation costs. Next quarter, global commodities markets are projected to experience an unprecedented 40 percent surge in petroleum prices due to regional export restrictions. Therefore, policymakers must urgently prepare for an imminent and severe national economic downturn.

Which of the following accurately describe a reasoning flaw in the analyst's argument? Select all that apply.

Select all that apply

Show answer & explanation

Answer: It takes for granted that the structural economic vulnerabilities present during previous decades persist unaltered into the present day.; It projects a historically established causal mechanism into the future without considering whether relevant intervening circumstances have shifted.

Answer

The correct options are the one stating it assumes structural economic vulnerabilities persist unaltered, and the one stating it projects a historical causal mechanism into the future without considering shifted circumstances.
The correct choices accurately target the argument's vulnerability: it relies on historical evidence (the last four decades) to guarantee a future event. To do this, it must assume that the relevant background conditions (e.g., the economy's reliance on oil, alternative energy availability, manufacturing processes) have not changed. Both correct descriptions highlight this unwarranted temporal leap from past causal mechanisms to future outcomes.

Step-by-Step Solution

1
Identify the premises of the argument.
Premise 1: Past petroleum price spikes caused economic downturns. Premise 2: A 40% price spike is projected for next quarter.
Deconstructing the argument is the first step to evaluating its logical validity.
2
Identify the conclusion of the argument.
Conclusion: Policymakers must prepare for an imminent economic downturn.
The conclusion represents the claim that the author believes is supported by the premises.
3
Analyze the gap between the premises and the conclusion.
The argument relies on the assumption that what happened in the past (petroleum spikes causing downturns) will necessarily happen in the future.
Identifying the unstated assumptions reveals the logical flaws in the reasoning.
4
Categorize the flaw based on the identified gap.
The gap is a 'Time Shift Flaw'. The author assumes that static conditions have persisted over the last four decades and that historical trends will perfectly extrapolate into the future.
Matching the gap to known LSAT flaw archetypes helps in selecting the accurately phrased answer choices.
5
Evaluate the options against the identified flaw.
Two options correctly describe this temporal assumption using different abstract language. The others describe flaws (equivocation, quantifier overreach, structural confusion) not present in the stimulus.
Because this is a multiple-selection question, all valid descriptions of the core flaw must be identified.

Key Concept

Time Shift Flaws (Past vs. Future) occur when an argument assumes that historical conditions, relationships, or trends will necessarily continue unchanged into the present or future.
Question 7Question →

Analyze the following argument excerpts. Match each argument with the precise description of the temporal shift flaw it exhibits.

Click a left item, then click its matching right item

Items

For over a century, the primary export of the Valdonian region has been unprocessed timber, an industry that has consistently sustained its local economy. Therefore, even with the new global synthetics initiative taking effect next year, Valdonia's economic stability will undoubtedly continue to rely on raw timber exports.
Over the past five quarters, our technology firm's user acquisition rate has doubled every three months due to the viral success of our flagship application. Consequently, we can safely project that by the end of the decade, we will double our user base every three months, reaching unprecedented global market penetration.
When the municipal government lowered the commercial property tax rate in 1998, downtown retail vacancy rates plummeted within two years. To revitalize the currently struggling downtown retail sector, the city council must lower the commercial property tax rate again; this intervention will certainly result in a similar plunge in vacancies.
Since the establishment of the central banking system seventy years ago, the nation has never experienced a hyperinflationary spiral. Thus, citizens need not worry about hyperinflation wiping out their savings in the coming decades, regardless of the government's unprecedented new monetary expansion policies.

Matches

Show answer & explanation

Answer

The correct pairings match each argument's specific logical leap regarding time with its abstract methodological description: The timber argument relies on a static condition; the user acquisition argument extrapolates an unsustainable trend; the tax rate argument maps a singular historical event to the future; and the central banking argument relies on the historical absence of a phenomenon.
Each argument commits a specific variation of the Time Shift Flaw. While all of them inappropriately assume that the past dictates the future, the structural mechanism of the error varies. The timber scenario ignores context changes to assume a steady state continues. The tech scenario projects an unsustainable geometric trend. The tax scenario assumes a past action in a specific historical context will yield identical results in a modern context. The inflation scenario assumes that just because something hasn't happened yet, it never will.

Step-by-Step Solution

1
Analyze the premise of each argument to identify the nature of the historical baseline or past data provided.
Identified whether the premise relies on a continuous static state, a geometric trend, a historical absence, or a singular past intervention.
Time shift flaws take distinctly different forms depending on the nature of the past evidence being projected into the future.
2
Examine the conclusion drawn from each historical baseline to locate the temporal leap.
Pinpointed the specific unwarranted assumption bridging the past data and the future prediction in each scenario.
The core of the flaw lies in the logical gap between what happened before and what the author guarantees will happen next.
3
Evaluate the abstract methodological descriptions and align them with the identified assumptions.
Successfully matched the specific type of temporal fallacy to its highly abstracted, LSAT-style diagnostic phrasing.
Accurately classifying logical fallacies on the LSAT requires translating concrete scenarios into abstract logical structures.

Key Concept

Time Shift Flaws (Past vs. Future)
Question 8Question →

Technology Analyst: Over the past thirty years, every major shift in data-storage paradigms—from localized servers to distributed cloud networks, and later to quantum-holographic arrays—initially caused a severe revenue contraction in the cybersecurity sector. Yet, in every past instance, the unique vulnerabilities of the new technologies subsequently generated unprecedented demand, causing the sector's revenue to expand to levels far exceeding pre-transition peaks. The industry is currently experiencing a sharp revenue decline as organizations migrate to bio-synthetic data storage. Therefore, investors should remain confident, as the cybersecurity sector’s revenue will undoubtedly rebound and reach new historical highs within the next few years.

The reasoning in the analyst's argument is most vulnerable to criticism on which of the following grounds? (Select all that apply.)

Select all that apply

Show answer & explanation

Answer: It takes for granted that the underlying background conditions that allowed previous technological vulnerabilities to translate into revenue growth will remain unchanged in the current era.; It presumes, without providing adequate justification, that a chronological pattern of economic contraction and subsequent expansion observed in the past guarantees the recurrence of that pattern in the future.

Answer

The correct answers are the options stating that the argument takes for granted that underlying background conditions will remain unchanged, and that it presumes a past chronological pattern guarantees future recurrence.
The argument commits Time Shift Flaws by unjustifiably projecting past events into the future. First, it assumes static conditions: it takes for granted that the background economic, regulatory, or structural factors that allowed past cybersecurity vulnerabilities to generate massive revenue will remain constant for the bio-synthetic era. Second, it engages in trend extrapolation: it presumes that a chronological pattern of contraction followed by expansion is an immutable rule that guarantees the same sequence of events in the future, ignoring the possibility of unique modern disruptions.

Step-by-Step Solution

1
Analyze the argument's structure to identify the premises and conclusion.
Premises: Past data-storage shifts caused initial sector revenue contractions, but the new vulnerabilities always subsequently caused revenue expansion. Current state: The industry is currently contracting due to a new bio-synthetic data shift. Conclusion: The sector's revenue will undoubtedly rebound and reach new highs soon.
Understanding the structural relationship between evidence and conclusion is required to spot logical gaps.
2
Identify the primary logical leap between the premises and the conclusion.
The argument uses evidence of past occurrences (previous tech transitions) to justify a definitive, guaranteed claim about a future occurrence (the bio-synthetic transition).
Identifying the nature of the leap reveals the specific category of logical flaw present.
3
Evaluate the argument for temporal shift flaws.
The leap relies on two unwarranted temporal assumptions: 1) that the underlying conditions enabling past recoveries still exist today, and 2) that a historical pattern of contraction and expansion will inevitably repeat itself regardless of novel contexts.
The question asks to identify vulnerabilities in the reasoning, specifically targeting how the argument improperly projects the past into the future.
4
Evaluate the answer choices against the identified temporal flaws.
Two options accurately describe these specific temporal leaps without mischaracterizing the premises or identifying unrelated fallacies.
This is a multiple-selection question requiring the identification of all valid descriptions of the argument's temporal flaws.

Key Concept

Time Shift Flaws (Past vs. Future)
Question 9Question →

Mayor: Over the last two decades, the population of our city has steadily increased by exactly 5 percent every year. The city is currently facing a housing shortage. Based on this historical data, we can conclude that the city's population will definitely grow by 5 percent next year, exacerbating the housing shortage.

Which one of the following most accurately describes a flaw in the mayor's reasoning?

Show answer & explanation

Answer: It takes for granted that a trend that has occurred consistently in the past will necessarily continue into the future.

Answer

The option stating that the argument takes for granted that a past trend will necessarily continue into the future.
The correct answer accurately identifies the temporal leap in the argument. The mayor uses purely historical data (past growth) to make a definitive claim about future events (growth next year), without providing any evidence that the underlying conditions driving that growth will remain the same.

Step-by-Step Solution

1
Analyze the structure of the argument.
Premise: Population has grown by 5% every year for the past two decades. Conclusion: Population will grow by 5% next year.
Identifying the premises and the conclusion is the essential first step in evaluating any logical flaw.
2
Identify the logical gap between the premise and the conclusion.
The gap is the assumption that past conditions will remain unchanged in the future.
Conclusions in flawed arguments rely on unwarranted assumptions. Here, the evidence is entirely historical, but the conclusion is a definitive prediction.
3
Match the identified gap to the answer choices.
The correct option explicitly identifies the unwarranted assumption that a historical trend will automatically continue.
This matches the definition of a time shift flaw, which is the central error in the mayor's argument.

Key Concept

Time Shift Flaws (Past vs. Future)
Estimated Time:1m 0s
Question 10Question →

Review the following short arguments, each of which contains a reasoning flaw related to time shifts. Match each argument to the description that most accurately identifies its specific temporal fallacy.

Click a left item, then click its matching right item

Items

NovaCorp has maintained peak profitability for a decade by focusing exclusively on physical retail stores. Therefore, maintaining this exclusive focus guarantees NovaCorp's continued profitability over the next decade.
Records dating back three centuries show the regional aquifer has never dropped below a reserve of 40%. Consequently, the new agricultural irrigation initiative cannot possibly deplete the aquifer.
Since the introduction of electric vehicles, the percentage of citizens using public transit has decreased slightly each year. It is clear that public transit systems will eventually lose all their ridership.
When the city suspended downtown parking fees in 1995, local retail revenue soared for six months. Thus, suspending downtown parking fees next month will certainly produce a comparable retail boom.

Matches

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Answer

NovaCorp matches the assumption of persisting business conditions; the aquifer matches the assumption that historical absence proves future impossibility; the transit argument matches the unwarranted projection of a trend to zero; the parking fee argument matches the assumption of static background circumstances for a past intervention.
Each argument inappropriately leverages past or present data to make an unwarranted claim about the future. By identifying the specific nature of the premise (a trend, a historical absence, a past success, a discrete past policy) and the nature of the conclusion (absolute zero, impossibility, guaranteed future success, identical policy outcome), each argument can be mapped to its precise abstract flaw description.

Step-by-Step Solution

1
Analyze the NovaCorp argument to isolate the time shift.
It infers future guaranteed success from the past success of an ongoing strategy.
This corresponds to taking for granted that a strategy succeeding under past conditions will remain optimal.
2
Analyze the regional aquifer argument.
It infers future physical impossibility of depletion based entirely on a historical lack of occurrence.
This corresponds to treating the historical absence of an extreme event as definitive proof it cannot happen.
3
Analyze the public transit argument.
It extrapolates an ongoing, slight annual decline to a conclusion of absolute zero.
This corresponds to projecting a directional trend indefinitely without considering a plateau.
4
Analyze the downtown parking fees argument.
It infers that repeating a discrete past action from 1995 will yield the exact same result today.
This corresponds to treating a historical correlation as a causal guarantee for a future intervention.

Key Concept

Time Shift Flaws (Past vs. Future)
Question 11Question →

Agronomist: Since the widespread adoption of synthetic nitrate fertilizers in this region thirty years ago, the annual per-hectare yield of corn has increased by at least two percent every single harvest. The regional climate and soil types have not changed during this timeframe. Therefore, farmers in this region who continue using these synthetic nitrate fertilizers can reliably expect their corn yields to continue growing by at least two percent annually for the foreseeable future.

The reasoning in the agronomist's argument is flawed in that the argument

Show answer & explanation

Answer: inappropriately relies on the assumption that a historical rate of change will extend indefinitely into the future

Answer

The correct answer identifies that the argument inappropriately relies on the assumption that a historical rate of change will extend indefinitely into the future.
The correct answer accurately diagnoses the structural flaw in the agronomist's reasoning. The agronomist observes a past trend (a 2 percent annual yield increase over thirty years) and assumes this exact rate of growth will continue indefinitely ('for the foreseeable future'). This is a classic Time Shift Flaw, as it ignores the reality that past trends often face eventual limits (e.g., soil depletion, biological maximums) and cannot simply be projected forward without justification.

Step-by-Step Solution

1
Analyze the premises to determine the basis of the argument.
The premises establish a past and present trend: corn yields have increased by 2 percent annually for thirty years alongside the use of synthetic fertilizers.
Understanding the evidence is required to evaluate how it connects to the conclusion.
2
Identify the main conclusion.
The conclusion predicts that farmers can expect yields to continue growing by at least 2 percent annually for the foreseeable future.
The logical flaw exists in the gap between the given evidence and the final conclusion.
3
Evaluate the logical gap between the premises and the conclusion.
The argument takes a historical trend (past 30 years) and directly projects it into the future, assuming no changes or natural limits will interrupt this continuous exponential growth.
This is the structural vulnerability of the argument, known as a Time Shift Flaw.
4
Select the option that best abstracts and describes this temporal error.
The option stating the argument assumes a historical rate of change will extend indefinitely perfectly encapsulates the Time Shift Flaw.
This matches the identified logical gap without introducing outside information.

Key Concept

Time Shift Flaws occur when an argument assumes that conditions or trends that were true in the past will necessarily continue to be true in the future, failing to account for variables that change over time or natural limits (such as biological caps on crop yields).
Question 12Question →

Analyze the following four arguments, each of which draws a flawed conclusion about the present or future based on past conditions. Match each argument to the statement that best diagnoses its specific time-shift fallacy.

Click a left item, then click its matching right item

Items

City Planner: This intersection has operated without a single major collision since it was constructed fifty years ago. Therefore, we do not need to install traffic lights even with the opening of the new shopping complex on the adjacent lot.
Promoter: The Crimson Phantoms' upcoming reunion tour will undoubtedly sell out every stadium. After all, during their prime in the late 1980s, every single concert they played was sold out within minutes.
Financial Advisor: Invest in StartUp-X immediately. Their valuation has grown by exactly 20 percent each month for the last twelve months, so you can expect a 20 percent return on your investment next month.
Inspector: There is no need to test the drinking water at the old municipal building for lead contamination this year. The pipes were comprehensively evaluated a decade ago and declared completely free of lead.

Matches

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Answer

City Planner matches the failure to consider new variables; Promoter matches the failure to consider shifting public tastes; Financial Advisor matches the unwarranted projection of a historical trend; Inspector matches the presumption of a static physical state.
Each argument contains a distinct variation of the time shift flaw. The City Planner ignores new environmental variables (the mall). The Promoter ignores changing cultural tastes over time. The Financial Advisor unjustifiably extrapolates a short-term trend. The Inspector assumes a physical state is immune to degradation over a decade. Matching these specific logical errors to their precise descriptions correctly identifies the flaws.

Step-by-Step Solution

1
Analyze the City Planner's argument for its specific temporal assumption.
The argument uses a past record of safety to predict future safety but explicitly ignores a newly introduced factor (the shopping complex).
Identifying the specific mechanism of the flaw—ignoring a new variable that disrupts the historical pattern—is required to find the matching description.
2
Analyze the Promoter's argument for its specific temporal assumption.
The argument assumes that a band's massive success in the 1980s guarantees success today.
Recognizing the failure to account for changing tastes over decades pinpoints the flaw of assuming static popularity.
3
Analyze the Financial Advisor's argument for its specific temporal assumption.
The argument expects a past mathematical trend (20 percent monthly growth) to continue automatically into the future.
Recognizing the unwarranted extrapolation of a numerical trend allows for matching with the correct diagnosis regarding historical trends.
4
Analyze the Inspector's argument for its specific temporal assumption.
The argument assumes that a physical condition (lead-free pipes) tested in the past remains static a decade later.
Identifying the assumption of a permanent physical state helps select the description regarding degradation or alteration over time.

Key Concept

Time Shift Flaws often occur when an author assumes that conditions present in the past will remain unchanged in the present or future, failing to account for new variables, changing trends, or the natural degradation of physical states over time.
Estimated Time:1m 30s
Question 13Question →

City Council Member: Over the past fifteen years, our city's transition to using a new synthetic asphalt binder has directly caused a steady decrease in our annual road maintenance costs. Since we plan to continue using this synthetic binder exclusively, we can confidently project that our annual road maintenance costs will continue to decrease over the next ten years.

Which one of the following most accurately describes a flaw in the city council member's reasoning?

Show answer & explanation

Answer: takes for granted that a trend observed in the past will necessarily persist into the future

Answer

The correct answer identifies that the argument illicitly assumes a historical trend will continue indefinitely into the future.
The argument commits a classic Time Shift Flaw. It takes a historical trend (a steady decrease in maintenance costs over 15 years) and improperly projects it into the future. It fails to consider that the initial savings might have represented a one-time optimization curve, and that costs cannot decrease indefinitely (eventually hitting a floor).

Step-by-Step Solution

1
Analyze the argument's structure.
Premise: Using the new binder caused costs to decrease steadily over the past 15 years. Conclusion: Costs will continue to decrease over the next 10 years because the binder will still be used.
Deconstructing the argument is the first step to evaluating its logical validity.
2
Identify the gap between the premise and the conclusion.
The argument uses historical data (past 15 years) to make a definitive projection about the future (next 10 years) without guaranteeing conditions will remain the same.
Finding the unwarranted assumption reveals the logical flaw.
3
Determine the specific logical fallacy committed.
The author assumes that a past trend of cost reduction will continue indefinitely. It is entirely possible that the maximum cost-saving benefit of the new binder has already been reached, and costs will now stabilize.
Naming the specific flaw (Time Shift Flaw) makes it easier to match with the correct abstract answer choice.
4
Evaluate the options against the identified flaw.
The correct option perfectly describes the assumption that a past trend will persist into the future.
This confirms the answer without falling for trap choices that describe different fallacies.

Key Concept

Time Shift Flaws occur when an argument improperly projects past or present conditions, trends, or behaviors into the future without establishing that the underlying circumstances will remain unchanged.
Time Shift Flaws (Past vs. Future) Practice Questions — LSAT | Examkin