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OFFICIAL EXPLANATION
(1) Even if companies that allocate higher budgets to advertising tend to also have increased sales revenue, that might mean only that their increased sales revenue has given them more money to spend on their ineffective advertising. Furthermore, even those companies allocating high budgets to effective advertising might be doing so inefficiently; they might be able to cut their advertising expenses drastically without reducing their advertising effectiveness. Thus, whether effective advertising requires a higher budget expense than ineffective advertising cannot be determined from (1) alone; NOT sufficient.

(2) Even if effective advertising can drive higher consumer demand, it might not need to cost much. Thus, whether effective advertising requires a higher budget expense than ineffective advertising cannot be determined from (2) alone; NOT sufficient.

Taking (1) and (2) together, even if companies that allocate higher budgets to advertising also tend to have increased sales revenue, and even if effective advertising can drive higher consumer demand, many companies with higher budgets and increased sales revenue may nonetheless be advertising inefficiently; they might be able to cut their advertising expenses drastically without reducing advertising effectiveness. If so, effective advertising may not require a higher budget expense than ineffective advertising.

The correct answer is E; both statements together are still not sufficient.
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Question: budget (effective) > budget (ineffective).....Yes/No???

We need some information like:
Effective advertising → budget = ?
Ineffective advertising → budget = ?

Statement 1 talks about Higher budget → higher sales (correlation)
It doesn't say anything about whether the advertising is "effective or ineffective". So, insufficient.

Statement 2 states a possibility that Effective advertising "can drive" higher demand
However, it does not talk about "budget". So, insufficient.

Statement 1+2:
Higher budget → higher sales
Effective advertising → higher demand
We don't have sufficient information to concretely say which of the two advertising has higher budget expense. So, insufficient.

Answer E
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MartyMurray

But can't statement 1 also mean higher budget ---> effective advertising, as it is increasing the revenue?
Increase in revenue is directly linked to effectiveness, no?
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MartyMurray

But can't statement 1 also mean higher budget ---> effective advertising, as it is increasing the revenue?
Increase in revenue is directly linked to effectiveness, no?
Yes, statement (1) indicates that a higher budget can make advertising more effective.

At the same time, the question asked is not whether a higher budget is helpful. It's whether a higher budget is required.

So, statement (1) is not sufficient to answer the question because it doesn't indicate that a higher budget is required.

After all, even if a higher budget can be a factor in the effectiveness of advertising, there may be ways to make advertising effective without a higher budget.
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