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# To develop more accurate population forecasts, demographers

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To develop more accurate population forecasts, demographers [#permalink]

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28 Oct 2007, 19:05
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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 economic
[Reveal] Spoiler: OA

Last edited by mikemcgarry on 20 Feb 2017, 11:06, edited 1 time in total.
corrected typo in choice (E): should be "economic"
If you have any questions
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hbs2012 wrote:
Question 32 Set 1

To develop more accurate population forecasts, demographers have to know a great deal more tha now about the social and economic detriments of fertility.

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 then now about the social and economical.

help

A,E --> comparing "have to know a great deal" vs "now" ---> INCORRECT.

"have to know a great deal" vs "they do [know]now" --> Proper comparision

B,C,E -- economical -- which means "cheap" is not appropriate in this contest

Economic means "having to do with the economy or the study of economics."

Economical means "careful or prudent in managing finances, money- saving."

D is the best.
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Re: To develop more accurate population forecasts, demographers [#permalink]

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02 Sep 2010, 11:08
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Hey All,

I got asked about this privately, but I think the same question was asked by mymisc as well. The question is, do we need the "would" here, and why? The issue is that this sentence is a hypothetical/conditional:

To develop more accurate population forecasts

We could reword this as "If we wanted more accurate forecasts, demographers..."

In a conditional construction, we need the "would". Look at how it would work in a NON-conditional:

To develop accurate population forecasts, demographers have to know a great deal more...

See how, in that example, without the "more," we're just talking about a fact (how forecasts are developed accurately)? But with the conditional, we need the complete conditional construction, with "would."

Let me know if you have any follow-up questions!

-t
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Re: To develop more accurate population forecasts, demographers [#permalink]

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02 Jun 2010, 00:22
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OA is D.

Q41 - OG12:
Verb form; Logical predication
Th is sentence explains a hypothetical situation and therefore calls for a conditional—or contraryto- fact—construction, because in order to more accurately predict population, demographers would have to know more than they presently
know. A present-tense verb is required to describe the current state of demographers’ knowledge, and the comparison made by the sentence must be
between current and conditional knowledge, not between knowledge and time of knowing (now). A Wrong comparison—between knowledge and time (now); conditional verb is needed. B Conditional verb is needed; economical is the
wrong adjective. C Economical is the wrong adjective. D Correct. Conditional knowledge, indicated by would have to know, is correctly compared
to current knowledge. E Wrong comparison—between what demographers need to know and now.

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Re: To develop more accurate population forecasts, demographers [#permalink]

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11 Feb 2013, 11:12
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Expert's post
rajathpanta wrote:
Vercules wrote:
Hi rajathpanta,

Which question you are referring to. The main question of the post or your specific question. If it is your specific question, the please let me know which one.

Vercules

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic detriments 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

Here, why is would used?? I wanted to understand that as per your explanation given.

Hi rajathpanta,

In my last explanation I did not discuss hypothetical would, but a few rules related to would. I guess that you are confused because you are not able to find any conditional construct in the question above. The hypothetical would is used based on the context of the sentence. In almost all the questions which test standard conditional constructs "if then" constructions are used.

See the below question from OG12 which uses the conditional if x happened, then y would happen.

Q 67) Affording strategic proximity to the Strait of Gibraltar,.......

In the question above hypothetical conditional would is used. The sentence expresses a hypothetical situation, which needs a hypothetical conditional would. But, the incorrect answers are incorrect for different reasons, other than the use of would.

The question does not really test your knowledge on conditionals if you solve it by POC. The following question will also have the correct answer as (D). I have just made a change in option (D) ( "would have to" to "have to")

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic detriments 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) 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

Correct choice is (D) because other options are wrong for clear grammatical and contextual errors; Although, "would have to know" will be better because the hypothetical situation is being discussed

The same conditional is tested in the following OG question;

Q 16) Retail sales rose 0.8 of 1 percent in August,
intensifying expectations that personal spending.....

I hope the above explanation helps,

Vercules
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Re: To develop more accurate population forecasts, demographers [#permalink]

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28 Oct 2007, 23:23
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english_august wrote:
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

OA is E. IMO it should be D. What do you think?

D

AB: would establishes meaning better elim these two choices.

C: economical is inappropriate here. means inexpensive
E: same economical is inappropriate here. means inexpensive

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24 Dec 2008, 16:05
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I'd go with (D).

This is future conditional, so I would eliminate (A) and (B) since they do not have "would".

I would eliminate (E) because of the faulty comparison. Comparing "know a great deal" and "now" is not apples to apples.

Your remaining choices are identical except for economic v. economical. Economical sounds weird to me in this context, so I'd go with (D).
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22 May 2010, 21:39
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I'll go for "D".

But, there is one question in answer choice "D" THEY refers to what? Population or Demographers? Is this ambigous or Ok?
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Re: To develop more accurate population forecasts, demographers [#permalink]

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07 Jun 2010, 06:34
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I will choose D

social and economic --> economic means related to finance ---> intended meaning

economical -thrifty ---> changes the meaning of the sentence --> making the fertility sound economical

A is clear OUT

D is left.
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Re: To develop more accurate population forecasts, demographers [#permalink]

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28 Aug 2010, 11:36
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Hey Noburu,

Just to weigh in real quickly, we don't want "efficient" here. We want "economic", meaning "related to the economy" (economy meaning "wealth and resources" of a region or country). We want to know how economic (money-related) factors relate to fertility, etc.

-t
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Re: To develop more accurate population forecasts, demographers [#permalink]

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08 Jun 2012, 07:24
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hbs2012 wrote:
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic detriments 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

Question 32 Set 1

help

i pick D here. this is a conditional sentence. one condition is to be fulfilled to develop more accurate population forecasts that demographers need to know more social and economic detrimental facts of fertility. So A and B are out. "economical" is just wrong here so C is out. in E comparison is not expressed properly. correct me if i am wrong.

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Re: To develop more accurate population forecasts, demographers [#permalink]

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11 Feb 2013, 08:34
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rajathpanta wrote:
MGMAT says 'would' is used to express the future from the past's point of view.

Ex- The scientist believes that the machine would be wonderful

The above example is wrong as 'believes' is in present. If believes is replaced by 'believed' the ex becomes correct.

Now can someone explain why would is used here as the tense used in the question is simple present/present perfect.

Hi rajathpanta,

The scientist believes that the machine would be wonderful --> is incorrect because here we are mixing present with conditional.

Why is this so? because it is a rule. For conditionals there a few rules and you have to just remember them, there is not much to understand here. The rules on Conditionals are governed by set rules. MGMAT has explained the rules quite well, just make a note of them.

Consider this sentence: The scientist said that the machine would be wonderful. --> here "would" is expressing past as it is being used in the reported speech. The sentence is correct as per another rule on the usage of would.

The scientist believed that the machine would be wonderful - Correct usage, "would" expresses future from the past point of view.

Hope that helps,

Vercules
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Re: To develop more accurate population forecasts, demographers [#permalink]

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11 Feb 2013, 12:15
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rajathpanta wrote:
of if there is a conditional and there are options with 'would' and options without 'would' we should prefer the 'would' ones is what I can gather as of now.

Hi rajathpanta,

From what I have seen in a lot of GMAT questions, I agree with you. In my estimate, I think you will be correct 80% of the times in selecting answer choice with would. Most often than not I have seen that it is relatively easier to do a 3:2 split based on apparent errors, but if you are stuck between two otherwise correct answer choices, which differ in the placement of just a word, then the choice with that word is likely to be the correct one.

Following example from OG12 contains an incorrect "would" option.

Q 39) In 1527 King Henry VIII sought to have his marriage to.......

Option (E) contains a conditional would, but you can get from the meaning that the usage is incorrect.

Vercules
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Re: To develop more accurate population forecasts, demographers [#permalink]

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11 Jun 2013, 01:56
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hbs2012 wrote:
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic detriments 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

Question 32 Set 1

help

First split: economical VS economic
*Economical = efficient
*Economic = "money" value
==> Clearly, "economic detriments" is correct ==> B, C, E are out
A is wrong because the intended meaning is: in the future, demographers would have to know .... more than they do now. But in A, "have to know...more than now" is incorrect.

Only D is correct.
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08 Jan 2009, 13:54
I totally agree.. but the correct answer option according to the answer key that I ahve is E

which for the reason mentioned above.. can not be true..

sorry for the delay in replyin
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10 Jan 2009, 20:31
D is appropriate; but OA is said to be E.
may be OP made a typo by mistake and typed then as opposed to than. Still,
more than now as opposed to more than they do now is right?
GMAT TIGER wrote:
hbs2012 wrote:
Question 32 Set 1

To develop more accurate population forecasts, demographers have to know a great deal more tha now about the social and economic detriments of fertility.

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 then now about the social and economical.

help

D. "To develop ......... forecasts" is a future act, so require "............ would have to" know"
Economic > economical.

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21 May 2010, 07:49
should be (D).

I dont agree with OA.

'economical' is wrong in this context. Also the comparison is wrong in E
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22 May 2010, 08:01
I go with D.

First of all, A is incorrect due to nonparallel structure
B, C, E are eliminated due to incorrect word use "economical"
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23 May 2010, 18:13
IMO D as well.

Another reason for the OA NOT being E is because of the use of 'economical' instead of 'economic' which can imply that the 'detriments' were 'economical' whereas the correct use is 'economic detriments'.
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25 Jul 2010, 12:06
E is an incorrect answer on the Sets key...

You need an economic at the end and not "economical"
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Re: SC: Demographers   [#permalink] 25 Jul 2010, 12:06

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