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The following sentences, labeled 1 to 5, relate to a single topic. Four of these sentences can be arranged to form a logical paragraph. Identify the sentence that does not fit with the others and enter its number as your answer.

1. This 'behavioral turn' in economics posits that humans are not the rational, utility-maximizing agents—Homo economicus—suggested by classical models, but are instead governed by cognitive biases.

2. Loss aversion, for instance, demonstrates that the psychological pain of losing $100 is significantly more intense than the joy of gaining the same amount.

3. Consequently, public policy design has increasingly shifted toward 'nudging' individuals into making better decisions without restricting their freedom of choice.

4. Traditional macroeconomics remains primarily concerned with the aggregate behavior of an economy, focusing on indicators like GDP growth, inflation, and unemployment rates.

5. Heuristics, or mental shortcuts, allow us to navigate complex information quickly, though they often result in systematic errors in judgment and financial planning.

Correct Answer: 4
Identification of the Theme: The core argument centers on the principles and applications of Behavioral Economics, specifically focusing on cognitive biases and their influence on individual decision-making and policy.
Logical Sequence of the Coherent Paragraph: 1-5-2-3.
Sentence 1 introduces the fundamental shift from classical rational models to the "behavioral turn" characterized by cognitive biases.
Sentence 5 expands on the mechanism of this behavior by introducing "heuristics" and their role in creating systematic errors.
Sentence 2 provides a specific, tangible example of these errors through the concept of "loss aversion."
Sentence 3 concludes by describing the practical application of these findings in the form of "nudging" in public policy.
Why Sentence 4 is the Odd One Out: While Sentence 4 is topically related to "economics," it shifts the focus to Macroeconomics and aggregate national indicators (GDP, inflation). The other four sentences form a specific, cohesive narrative about micro-level behavioral psychology and individual decision-making. Sentence 4 discusses a different branch of the discipline that operates at a level of scale and theory unrelated to the cognitive biases discussed.