New findings question the role of rational deliberation in preference aggregation. Computational simulations reveal it creates single-plateaued preferences, not necessarily single-peaked ones as previously thought.

➡️ Methodology:

* Employed computational simulations to model group deliberation and resulting preferences.

➡️ Key Finding:

* Rational deliberation tends to increase proximity to single-plateaued profiles when participants express indifference.

➡️ Contradiction with Received View:

* However, if participants are strongly opinionated (biased), deliberation can paradoxically produce irrational group preferences.

This research underscores two crucial elements for understanding deliberative processes: the significance of genuine preference change and the detrimental impact of strong biases. It suggests that while rational discourse is beneficial, its outcomes depend heavily on whether participants temper their views or cling firmly to them.