Commissioner: Budget forecasters project a revenue shortfall of a billion dollars in the coming fiscal year. Since there is no feasible way to increase the available funds, our only choice is to decrease expenditures. The plan before you outlines feasible cuts that would yield savings of a billion dollars over the coming fiscal year. We will be able to solve the problem we face, therefore, only if we adopt this plan.

Summarize Argument

The commissioner concludes that the only way to solve the problem of the revenue shortfall is by adopting his plan. He supports this with three premises:

(1) Budget forecasters predict a billion-dollar shortfall next year.

(2) We can't increase funds, so we must cut spending.

(3) This plan would cut spending and save a billion dollars.

Identify and Describe Flaw

This is the cookie-cutter flaw of mistaking sufficiency for necessity. The author treats “his plan” as necessary for “solve the problem.” But according to the premises, “his plan” is sufficient, not necessary.

In other words, the commissioner’s argument is flawed because he ignores the possibility that some other plan or solution could also solve the revenue shortfall. His plan might not be the only option.

A
relies on information that is far from certain

We have no reason to doubt the forecasters’ prediction and we can’t assume that it’s uncertain.

B
confuses being an adequate solution with being a required solution

The commissioner confuses an adequate (or sufficient) solution— his plan— with being a required (or necessary) solution. But just because his plan would solve the problem doesn't mean that it’s the only way to solve the problem.

C
inappropriately relies on the opinions of experts

The commissioner points to budget forecasters’ prediction about next year’s revenue shortfall. He relies on experts, but he doesn’t do so inappropriately since the experts’ prediction is within their own field.

D
inappropriately employs language that is vague

The commissioner uses clear and precise language throughout his argument. He doesn't inappropriately rely on vague language.

E
takes for granted that there is no way to increase available funds

The commissioner’s claim that there is no way to increase funds is a premise; we must accept that it’s true. So (E) doesn't describe a flaw in his argument.


4 comments

While grapefruit juice is a healthy drink, it has been discovered that a chemical in the juice affects how certain medicines are absorbed, with the result that normal medicinal doses act like higher doses. Getting the wrong dose is dangerous. Since it is always desirable to take the lowest effective dose, the best medical approach would be to take lower doses of these medicines along with prescribed amounts of grapefruit juice.

Summarize Argument
The author concludes that lower dosages of certain medicines should be taken with grapefruit juice. This is because it’s best to take low dosages of medicine when possible, and grapefruit juice intensifies dosages. Thus, a lower dosage taken with grapefruit juice would act like a normal dosage.

Notable Assumptions
For this to be the “best medical approach,” the author must believe that grapefruit juice is consistent in its chemical composition. If one glass were to have even slightly more of the chemical than another glass, then the approach would be seriously, dangerously flawed.

A
The amount of the chemical in grapefruit juice is highly unpredictable from glass to glass.
Each glass of grapefruit juice isn’t equal. If the concentration of the chemical was significantly higher in one glass, then the medicine would be elevated to a dangerous dosage. This wouldn’t be “the best medical approach” by any standard.
B
Grapefruit juice is less expensive than most of the medicines with which it interacts.
We don’t care about how much grapefruit juice costs.
C
When scientists removed the chemical from grapefruit juice, the juice no longer affected how certain medicines were absorbed.
The author knows this. It’s integral to their argument about how grapefruit juice should be used with low dosages of medicine.
D
The chemical in grapefruit juice works by inhibiting an enzyme in the body that affects how certain medicines are metabolized.
This explains how grapefruit juice interacts with medicines. The author’s argument relies on this mechanism working.
E
Long before the chemical in grapefruit juice was identified, doctors were advising patients who took certain medicines to avoid grapefruit juice.
We don’t care that doctors probably knew that grapefruit juice intensifies medicines. We’re trying to weaken the author’s recommendation.

14 comments