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# To develop more accurate population forecasts, demographers

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Director
Joined: 19 Nov 2004
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To develop more accurate population forecasts, demographers [#permalink]

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28 Jan 2005, 22:49
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To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical

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SVP
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28 Jan 2005, 23:20
Must be "more than they do", so eliminate A, E.

Economical is different from economic in meaning. So eliminate B, C.

(D)

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SVP
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29 Jan 2005, 00:13
Economic: related to economy
Economical: frugal

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Director
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30 Jan 2005, 10:50
The unoffical answer says E. I think it is wrong.

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Director
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03 May 2005, 12:48
D..social and economic is not the same as social and economical

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VP
Joined: 26 Apr 2004
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04 May 2005, 10:02
MoscowFuturist wrote:
HongHu, what is wrong in A?

wrong comparison.

(A) To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

(D) To develop more accurate population forecasts, demographers would have to know a great deal more than they do now about the social and economic

scrutinize the colored part. Isn't choice D more clear?

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Manager
Joined: 04 May 2005
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04 May 2005, 16:44
Definitely D. "Economical" is unacceptable. "Would" is desirable, but probably not strictly necessary.

As for what's wrong with A ... could be tough if you're not a native English speaker, because this is rather idiomatic (and native speakers have trouble with it). Here goes:

"Than" used here is a conjuntion, connecting two clauses. It's often used in an elliptical construction, meaning some missing word is implied [see brackets below] It's like a seesaw that must be balanced:

subject verb modifier THAN subject verb [modifier]
I am taller THAN she is [tall]
My car is faster THAN yours is [fast]

Sometimes the 2nd verb is also ellipsed....

My car is faster than yours is fast.
My car is faster than yours.

And so, per (D). Here the word "do" adds a little confusion, but it's just a helping verb for know.

demographers know more THAN they do [know] now

- Supercat

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GMAT Club Legend
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04 May 2005, 16:49
Welcome to GMATclub supercat. You've been a recent member but I must commend you on your quality posts. Keep it up!
_________________

Best Regards,

Paul

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Intern
Joined: 04 May 2005
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04 May 2005, 22:43
(D) it is .... Two reasons:

'would' and 'than they do now' makes the menaing of the sentence more clearer. They are present in sentence (D) and hence it is right

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04 May 2005, 22:43
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