by zl7391e Mon Jun 27, 2011 6:16 pm
Yeah, I agree it's not a good argument.
My understanding is that the argument centers on the issues of what should be done to improve the public education. And the author proposed a demand-side reform.
1st sentence: on the supply side, reforms to improve public education is not enough to improve the public education.
2nd sentence: reforms must therefore come from the demand side (with the assumption that demand side reforms must have something that supply side can't offer).
The rest of stimulus in turn offers reasons why the reforms from the consumers (parents) is necessary to improve public education.
3rd sentence: a normative proposal (the content of the demand-side reform) as what parents/consumers should do.
4th sentence offers the key reason/premise why the proposal in 3rd sentence would work.
Academically underachieving schools will be forced to improve their academic offerings to attract student. Why? Because parents would spend vouchers (=money) at schools that are more academically achieving rather than those that are underachieving. So in order to be a valid argument, it must assume those factors that determines which schools parents/consumers would spend the vouchers must include academic considerations of the schools. And further in order for the 4th sentence to be true, academic considerations must override other non-academic considerations.
Therefore, A is required by the argument.
Also to see why A is necessary, negate A and the argument for the proposal wouldn't work.
Hope my writing is not too unclear, since I'm pretty tired from a long day.