by bbirdwell Thu Jan 21, 2010 7:17 pm
Perhaps I can help you understand this one. It's an odd question type, but works essentially like an Identify the Flaw question or an Assumption question. We'll need to identify the conclusion and premises and try to anticipate any logical gaps necessary to connect the two (i.e. assumptions).
On questions like this one, the correct answer will usually phrase an assumption as a question, the answer to which would naturally allow us to more readily evaluate the merits of the conclusion (a "yes" would solidify the conclusion while a "no" would call it into question or destroy it entirely).
In this argument, we have the following elements:
--raising taxes on essential goods always turns low- and middle tax-payers against govt
--for this reason, a tax on luxury items has been proposed
--officials claim that the luxury tax will:
1. result in a substantial increase in govt revenues
2. only affect wealthy individuals and corporations
What are some possible gaps in this logic? The first phrase that comes to attention is probably "substantial increase." We might wonder whether the new tax will affect the sales of luxury items -- if people don't want to pay a tax and sales of such items drop, will a "substantial increase" in revenue still result?
We might also wonder whether the new tax might affect the low- and middle- tax-payers indirectly somehow. Or whether the new tax will not turn the upper- tax-payers against the government.
Finally, when we go to the choices, we must be sure to remember the two critical points of the claim above, which we are to be evaluating.
(A) is irrelevant to points 1. and 2.
(B) is irrelevant -- a comparison to the other tax is not a critical part of the claim
(C) calls attention to the first point of the claim. If the sale of luxury goods do NOT continue at the current rate, but in fact drop, then perhaps the officials predictions (ostensibly projecting from the current rate) will not be accurate.
(D) is irrelevant to the claim. Whether or not support is WON is unimportant.
(E) the proportion of individuals to corporations is of no relevance to either claim.
(C) is the best answer.
In answer to your hesitance about (C), you are correct that it is still *possible* for "substantial revenues" to occur. The key point is that answering this question will help you to better evaluate that claim. If sales will not be affected, the claim is more likely to be true than if sales will be affected negatively. Doesn't make the claim impossible, or need to. Merely needs to draw attention to a critical point.
Hope that helps!