  We discuss a novel microscopic model for collective decision-making
interacting multi-agent systems. In particular we are interested in modeling a
well known phenomena in the experimental literature called equality bias, where
agents tend to behave in the same way as if they were as good, or as bad, as
their partner. We analyze the introduced problem and we prove the suboptimality
of the collective decision-making in the presence of equality bias. Numerical
experiments are addressed in the last section.
