In the context of the passage on free market economics, a major act of will will bring about a view of price-fixing that will be seen as what?

Introduction / Context:
The passage points out that many economists find it difficult to accept price-fixing as legitimate because of their belief in the free market. It then states what kind of mental effort is required to see price-fixing differently, and how it would be regarded after such an effort.

Given Data / Assumptions:
• The text states that it requires a major act of will to think of price-fixing as both normal and having a valuable economic function.
• This line directly connects the act of will with a new evaluation of price-fixing.
• The question asks which description matches this new view.
• The options paraphrase this description in various ways.

Concept / Approach:
We must accurately reproduce the two adjectives used in the passage to describe this changed view. Rather than picking general positive words, we focus on the exact phrasing: normal and having a valuable economic function. This preserves the meaning that price-fixing can be legitimate and useful in the industrial system.

Step-by-Step Solution:
Step 1: Locate the sentence that begins with Accordingly, it requires a major act of will. Step 2: Note the full expression to think of price-fixing as both normal and having a valuable economic function. Step 3: Identify the two key qualities: normal and valuable in economic terms. Step 4: Compare the options and look for the one that preserves both ideas. Step 5: Select normal and having valuable economic function as the precise match.

Verification / Alternative check:
Check if replacing the correct option with a different one in the sentence would change the meaning. Effective, productive, constructive or relevant are similar but do not capture the idea of normality in the same way, so they are less accurate.

Why Other Options Are Wrong:
Effective and productive: These focus only on output, not on the acceptance of price-fixing as normal.
Constructive and practical: These are general positive terms but do not reflect the specific wording of the passage.
Systematic and relevant: These describe organisation and connection but again do not address normality or economic value directly.

Common Pitfalls:
Students sometimes ignore the exact quotation and choose an option that merely sounds positive. In reading comprehension, however, precise recall often matters, especially when a key phrase is explicitly repeated in the question.

Final Answer:
The correct answer is normal and having valuable economic function, because the passage directly states that a major act of will is needed to see price-fixing in exactly these terms.