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Option B does indeed provide a logical completion of the argument by emphasizing that sales taxes can tax a smaller percentage of the earnings of high-income households compared to low-income households. This reinforces the economist's argument that sales taxes are regressive and unfair.
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­B. could tax a smaller percentage of the earnings of high-income households than of low-income households

The economist argues that sales taxes are unfair because low-income households spend almost all their income on necessities, while high-income households can save a significant portion.

A sales tax is levied on purchases, so a household spending a larger portion of their income will pay a higher percentage in sales tax compared to their income.

Meanwhile, high earners, with more savings and less spending (in percentage), would pay a smaller percentage of their overall income in sales tax compared to low earners who spend most of their income.
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What I have a problem with is this "could" in choice B. It's not just a possibility, the answer choice is stating a fact. Why then use "could" if there is no other outcome possible?­

EDIT: Took me a while but now I see it. They made a mistake. They meant to say that (as a sort of recommendation) that a sales tax COULD (and now the recommendation makes total sense) tax higher income households higher than lower income households. Why else were we provided with a comparison between sales tax and income tax and why else was the sales tax critisized for not being fair? I would even argue that like this, choice B is incorrect. If they are restating a fact then "could" is the wrong word to use; "will" would be more appropriate. As there is a clear destinction in the answer choices between "should", "could", and "would", I am now more than certain that choice B worded like this cannot be correct.
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Absolutely!! It is outrageously worded. And this being verbal, the precision of word-choices tend to matter. Glad someone else caught this.
SergejK
What I have a problem with is this "could" in choice B. It's not just a possibility, the answer choice is stating a fact. Why then use "could" if there is no other outcome possible?­

EDIT: Took me a while but now I see it. They made a mistake. They meant to say that (as a sort of recommendation) that a sales tax COULD (and now the recommendation makes total sense) tax higher income households higher than lower income households. Why else were we provided with a comparison between sales tax and income tax and why else was the sales tax critisized for not being fair? I would even argue that like this, choice B is incorrect. If they are restating a fact then "could" is the wrong word to use; "will" would be more appropriate. As there is a clear destinction in the answer choices between "should", "could", and "would", I am now more than certain that choice B worded like this cannot be correct.
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johnm2
Absolutely!! It is outrageously worded. And this being verbal, the precision of word-choices tend to matter. Glad someone else caught this.
SergejK
What I have a problem with is this "could" in choice B. It's not just a possibility, the answer choice is stating a fact. Why then use "could" if there is no other outcome possible?­

EDIT: Took me a while but now I see it. They made a mistake. They meant to say that (as a sort of recommendation) that a sales tax COULD (and now the recommendation makes total sense) tax higher income households higher than lower income households. Why else were we provided with a comparison between sales tax and income tax and why else was the sales tax critisized for not being fair? I would even argue that like this, choice B is incorrect. If they are restating a fact then "could" is the wrong word to use; "will" would be more appropriate. As there is a clear destinction in the answer choices between "should", "could", and "would", I am now more than certain that choice B worded like this cannot be correct.

But I believe they will argue this is just a general statement that doesn't make a recommendation. However, considering how certain the outcome of high taxation is for high income households this could actually feel incorrect, even if the answer is exactly what we are looking for. Considering all other choices we see that A cannot be correct as with the current sales tax (no amendments to the system are mentioned) all pay the same. C looks only at purchasers of the most expensive items, which doesn't provide a comparison. D is a recommendation that cannot be inferred from the logical flow as no amendments to the current system are mentioned, equally like in A. E is also incorrect as it provides a recommendation that we cannot base on any information provided in the argument. B is the only answer choice that actually explains why it would be unfair to tax different income households equally. However, this 'could' feels so wrong here as they present a fact statement and water the answer down with a probability/general statement. What is also strange, this probability argumentation is not used when describing why it is unfair, those are all factual statements in the argument. And then they jump into a general statement to account for all possibilities. Why?
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