Fast decisions reflect biases; slow decisions do not.

Area of Science:

• Decision Science
• Social Psychology
• Behavioral Economics

Background:

• Group decisions involve individuals with varying biases and information.
• Understanding how these factors influence collective outcomes is crucial.

Purpose of the Study:

• To investigate how initial biases and information quality affect group decision-making order and accuracy.
• To quantify the impact of decision timing on the reliability of group choices.

Main Methods:

• Agent-based modeling of independent individuals accumulating evidence.
• Mathematical analysis of decision dynamics in large populations.
• Derivation of asymptotic expressions for decision order and bias.

Main Results:

• Early deciders are those with the strongest initial biases, aligning decisions with bias over truth.
• Late deciders behave as if unbiased, improving decision accuracy.
• Initial bias, information quality, and decision order interact complexly.

Conclusions:

• The order of decisions significantly impacts group reliability.
• Strong initial biases can lead to premature, inaccurate group choices.
• Later decisions in evidence-accumulating groups tend to be more accurate and less biased.