The following five 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. Classical economic theory fundamentally predicates consumer behavior on the premise of utility maximization, asserting that individuals meticulously assess all available information to make perfectly rational and self-interested choices.
2. Conversely, the field of behavioral economics systematically dismantles this idealized construct, demonstrating empirically that psychological factors and cognitive heuristics consistently lead to predictable, irrational deviations from optimal decision-making.
3. These systemic biases, ranging from loss aversion to the endowment effect, often result in individuals making choices that are incongruent with their long-term welfare or are logically inconsistent under scrutiny.
4. Such insights reveal that market behavior is frequently driven by affective states, framing effects, and social norms, rather than purely by the dispassionate weighing of objective costs and benefits.
5. The practical implications of understanding these cognitive patterns have notably influenced public policy, inspiring 'nudge' interventions designed to subtly guide citizens toward more beneficial outcomes in areas like health and finance.